RMG Acquisition Corp. III (RMGCF) S-4/A 18 Dec 23 Registration of securities issued in business combination transactions (amended) Financial data

Document and Entity Information

Document and Entity Information	9 Months Ended
	Sep. 30, 2023
Cover [Abstract]
Document Type	S-4/A
Amendment Flag	false
Entity Registrant Name	RMG Acquisition Corp. III
Entity Central Index Key	0001838108
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false

CONDENSED BALANCE SHEETS (Q3)

CONDENSED BALANCE SHEETS (Q3) - USD ($)	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash	$ 310,838			$ 22,339				$ 93,599
Prepaid expenses	51,374			50,892				568,058
Total current assets	362,212			73,231				661,657
Cash and investments held in Trust Account	6,655,195			487,268,822				483,012,312
Total Assets	7,017,407			487,342,053				483,721,052
Current liabilities:
Accounts payable	33,367			153,571				73,405
Total current liabilities	7,873,824			1,173,416				163,692
Deferred legal fees	250,000			250,000				250,000
Deferred underwriting commissions	6,762,000			16,905,000				16,905,000
Convertible working capital loan - related party	$ 850,000			$ 500,000				$ 0
Notes Payable, Noncurrent, Related Party, Type [Extensible Enumeration]	Related Party [Member]			Related Party [Member]				Related Party [Member]
Derivative warrant liabilities	$ 2,323,923			$ 536,300				$ 14,301,100
Total liabilities	18,059,747			19,364,716				31,619,792
Commitments and Contingencies
Class A ordinary shares; 918,402 and 48,300,000 shares subject to possible redemption at $10.00 and $10.09 per share at September 30, 2023 and December 31, 2022, respectively	6,357,780			487,168,822				483,000,000
Shareholders' Deficit:
Preference shares, $0.0001 par value; 5,000,000 shares authorized; none issued and outstanding at September 30, 2023 and December 31, 2022, respectively	0			0				0
Additional paid-in capital	9,585,984			0				0
Accumulated deficit	(26,987,312)			(19,192,693)				(30,899,948)
Total shareholders' deficit	(17,400,120)	$ (15,537,132)	$ (23,390,077)	(19,191,485)	$ (20,017,781)	$ (19,024,609)	$ (25,123,550)	(30,898,740)	$ 10,221
Total Liabilities, Class A Ordinary Shares Subject to Possible Redemption and Shareholders' Deficit	7,017,407			487,342,053				483,721,052
Nonrelated Party [Member]
Current liabilities:
Accrued expenses	7,600,457			899,845				90,287
Related Party [Member]
Current liabilities:
Accrued expenses	240,000			120,000				0
Common Class A [Member]
Shareholders' Deficit:
Ordinary shares	0			0				0
Common Class B [Member]
Shareholders' Deficit:
Ordinary shares	$ 1,208			$ 1,208				$ 1,208

CONDENSED BALANCE SHEETS (Q3) (

CONDENSED BALANCE SHEETS (Q3) (Parenthetical) - $ / shares	Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2021	Feb. 09, 2021	Jan. 30, 2021
Shareholders' Deficit:
Preference shares, par value (in dollars per share)	$ 0.0001	$ 0.0001	$ 0.0001
Preference shares, shares authorized (in shares)	5,000,000	5,000,000	5,000,000
Preference shares, shares issued (in shares)	0	0	0
Preferred shares, shares outstanding (in shares)	0	0	0
Common Class A [Member]
Liabilities, Class A Ordinary Shares Subject to Possible Redemption and Shareholders' Deficit:
Temporary equity shares outstanding (in shares)	635,778	48,300,000	48,300,000
Shareholders' Deficit:
Ordinary shares, par value (in dollars per share)	$ 0.0001	$ 0.0001	$ 0.0001
Ordinary Shares, shares authorized (in shares)	500,000,000	500,000,000	500,000,000
Class A Common Stock Subject to Redemption [Member]
Liabilities, Class A Ordinary Shares Subject to Possible Redemption and Shareholders' Deficit:
Temporary equity shares outstanding (in shares)	635,778	48,300,000	0
Temporary equity, par value (in dollars per share)	$ 10	$ 10.09	$ 10
Common Class B [Member]
Shareholders' Deficit:
Ordinary shares, par value (in dollars per share)	$ 0.0001	$ 0.0001	$ 0.0001
Ordinary Shares, shares authorized (in shares)	50,000,000	50,000,000	50,000,000
Ordinary Shares, shares issued (in shares)	12,075,000	12,075,000	12,075,000	10,062,500
Ordinary Shares, shares outstanding (in shares)	12,075,000	12,075,000	12,075,000	10,062,500	12,075,000

CONDENSED STATEMENTS OF OPERATI

CONDENSED STATEMENTS OF OPERATIONS (Q3) - USD ($)		3 Months Ended						9 Months Ended		12 Months Ended
	Apr. 16, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
General and administrative expenses		$ 1,455,011			$ 293,696			$ 7,993,065	$ 1,408,870	$ 2,188,743	$ 1,842,337
Loss from operations		(1,455,011)			(293,696)			(7,993,065)	(1,408,870)	(2,188,743)	(1,842,337)
Other (expense) income:
Change in fair value of derivative liabilities		(355,739)			(697,008)			(1,787,623)	12,181,745	13,772,685	9,503,810
Reduction in deferred underwriter commissions	$ 440,592	0			0			440,592	0
Interest income - bank		1,048			0			1,330	0	193	54
Interest expense		0			(2,468)			0	(6,614)	(7,885)	0
Investment income earned on cash and investments held in Trust Account		63,138			2,179,997			1,562,977	2,880,650	4,299,827	50,412
Total other (expense) income, net		(291,553)			1,480,521			217,276	15,055,781	18,064,820	8,819,956
Net (loss) income		(1,746,564)	$ (3,248,492)	$ (2,780,733)	1,186,825	$ 6,684,896	$ 5,775,190	(7,775,789)	13,646,911	$ 15,876,077	$ 6,977,619
Weighted average common shares outstanding, Basic (in shares)										12,075,000	11,906,712
Weighted average common shares outstanding, Diluted (in shares)										12,075,000	11,906,712
Net (loss) income share, Basic (in dollars per share)										$ 0.26	$ 0.13
Net (loss) income share, Diluted (in dollars per share)										$ 0.26	$ 0.13
Common Class A [Member]
Other (expense) income:
Net (loss) income		$ (101,278)			$ 949,460			$ (1,450,300)	$ 10,917,529	$ 12,700,862	$ 5,468,324
Weighted average common shares outstanding, Basic (in shares)		743,298			48,300,000			2,768,541	48,300,000	48,300,000	43,139,178
Weighted average common shares outstanding, Diluted (in shares)		743,298			48,300,000			2,768,541	48,300,000	48,300,000	43,139,178
Net (loss) income share, Basic (in dollars per share)		$ (0.14)			$ 0.02			$ (0.52)	$ 0.23	$ 0.26	$ 0.13
Net (loss) income share, Diluted (in dollars per share)		$ (0.14)			$ 0.02			$ (0.52)	$ 0.23	$ 0.26	$ 0.13
Common Class B [Member]
Other (expense) income:
Net (loss) income		$ (1,645,286)			$ 237,365			$ (6,325,489)	$ 2,729,382	$ 3,175,215	$ 1,509,295
Weighted average common shares outstanding, Basic (in shares)		12,075,000			12,075,000			12,075,000	12,075,000	12,075,000	11,906,712
Weighted average common shares outstanding, Diluted (in shares)		12,075,000			12,075,000			12,075,000	12,075,000	12,075,000	11,906,712
Net (loss) income share, Basic (in dollars per share)		$ (0.14)			$ 0.02			$ (0.52)	$ 0.23	$ 0.26	$ 0.13
Net (loss) income share, Diluted (in dollars per share)		$ (0.14)			$ 0.02			$ (0.52)	$ 0.23	$ 0.26	$ 0.13

CONDENSED STATEMENTS OF CHANGES

CONDENSED STATEMENTS OF CHANGES IN SHAREHOLDERS' DEFICIT (Q3) - USD ($)	Total	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Common Class A [Member]	Common Class A [Member] Ordinary Shares [Member]	Common Class B [Member]	Common Class B [Member] Ordinary Shares [Member]
Balance at the beginning at Dec. 31, 2020	$ 10,221	$ 23,792	$ (14,779)		$ 0		$ 1,208
Balance at the beginning (in shares) at Dec. 31, 2020					0		12,075,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	6,977,619		6,977,619	$ 5,468,324		$ 1,509,295
Balance at the end at Dec. 31, 2021	(30,898,740)	0	(30,899,948)		$ 0		$ 1,208
Balance at the end (in shares) at Dec. 31, 2021					0		12,075,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	5,775,190	0	5,775,190		$ 0		$ 0
Balance at the end at Mar. 31, 2022	(25,123,550)	0	(25,124,758)		$ 0		$ 1,208
Balance at the end (in shares) at Mar. 31, 2022					0		12,075,000
Balance at the beginning at Dec. 31, 2021	(30,898,740)	0	(30,899,948)		$ 0		$ 1,208
Balance at the beginning (in shares) at Dec. 31, 2021					0		12,075,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Increase in redemption value of Class A ordinary shares subject to possible redemption	2,765,952
Net income (loss)	13,646,911			10,917,529		2,729,382
Balance at the end at Sep. 30, 2022	(20,017,781)	0	(20,018,989)		$ 0		$ 1,208
Balance at the end (in shares) at Sep. 30, 2022					0		12,075,000
Balance at the beginning at Dec. 31, 2021	(30,898,740)	0	(30,899,948)		$ 0		$ 1,208
Balance at the beginning (in shares) at Dec. 31, 2021					0		12,075,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	15,876,077		15,876,077	12,700,862		3,175,215
Balance at the end at Dec. 31, 2022	(19,191,485)	0	(19,192,693)		$ 0		$ 1,208
Balance at the end (in shares) at Dec. 31, 2022					0		12,075,000
Balance at the beginning at Mar. 31, 2022	(25,123,550)	0	(25,124,758)		$ 0		$ 1,208
Balance at the beginning (in shares) at Mar. 31, 2022					0		12,075,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Increase in redemption value of Class A ordinary shares subject to possible redemption	(585,955)	0	(585,955)		$ 0		$ 0
Net income (loss)	6,684,896	0	6,684,896		0		0
Balance at the end at Jun. 30, 2022	(19,024,609)	0	(19,025,817)		$ 0		$ 1,208
Balance at the end (in shares) at Jun. 30, 2022					0		12,075,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Increase in redemption value of Class A ordinary shares subject to possible redemption	(2,179,997)	0	(2,179,997)		$ 0		$ 0
Net income (loss)	1,186,825	0	1,186,825	949,460	0	237,365	0
Balance at the end at Sep. 30, 2022	(20,017,781)	0	(20,018,989)		$ 0		$ 1,208
Balance at the end (in shares) at Sep. 30, 2022					0		12,075,000
Balance at the beginning at Dec. 31, 2022	(19,191,485)	0	(19,192,693)		$ 0		$ 1,208
Balance at the beginning (in shares) at Dec. 31, 2022					0		12,075,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Remeasurement adjustment of Class A ordinary shares subject to possible redemption	(1,417,859)	0	(1,417,859)		$ 0		$ 0
Net income (loss)	(2,780,733)	0	(2,780,733)		0		0
Balance at the end at Mar. 31, 2023	(23,390,077)	0	(23,391,285)		$ 0		$ 1,208
Balance at the end (in shares) at Mar. 31, 2023					0		12,075,000
Balance at the beginning at Dec. 31, 2022	(19,191,485)	0	(19,192,693)		$ 0		$ 1,208
Balance at the beginning (in shares) at Dec. 31, 2022					0		12,075,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Increase in redemption value of Class A ordinary shares subject to possible redemption	135,254
Net income (loss)	(7,775,789)			(1,450,300)		(6,325,489)
Balance at the end at Sep. 30, 2023	(17,400,120)	9,585,984	(26,987,312)		$ 0		$ 1,208
Balance at the end (in shares) at Sep. 30, 2023					0		12,075,000
Balance at the beginning at Mar. 31, 2023	(23,390,077)	0	(23,391,285)		$ 0		$ 1,208
Balance at the beginning (in shares) at Mar. 31, 2023					0		12,075,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Remeasurement adjustment of Class A ordinary shares subject to possible redemption	1,399,029	0	1,399,029		$ 0		$ 0
Reduction in deferred underwriting commissions	9,702,408	9,702,408	0		0		0
Net income (loss)	(3,248,492)	0	(3,248,492)		0		0
Balance at the end at Jun. 30, 2023	(15,537,132)	9,702,408	(25,240,748)		$ 0		$ 1,208
Balance at the end (in shares) at Jun. 30, 2023					0		12,075,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Remeasurement adjustment of Class A ordinary shares subject to possible redemption	(116,424)	(116,424)	0		$ 0		$ 0
Net income (loss)	(1,746,564)	0	(1,746,564)	$ (101,278)	0	$ (1,645,286)	0
Balance at the end at Sep. 30, 2023	$ (17,400,120)	$ 9,585,984	$ (26,987,312)		$ 0		$ 1,208
Balance at the end (in shares) at Sep. 30, 2023					0		12,075,000

CONDENSED STATEMENTS OF CASH FL

CONDENSED STATEMENTS OF CASH FLOWS (Q3) - USD ($)	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash Flows from Operating Activities:
Net (loss) income	$ (7,775,789)	$ 13,646,911
Adjustments to reconcile net (loss) income to net cash used in operating activities:
Change in fair value of derivative liabilities	1,787,623	(12,181,745)
Interest expense	0	6,614
Investment income earned on cash and investments held in Trust Account	(1,562,977)	(2,880,650)
Reduction in deferred underwriting commissions	(440,592)	0
Changes in operating assets and liabilities:
Prepaid expenses	(482)	400,249
Accounts payable	(120,204)	62,745
Accrued expenses - related party	120,000	60,000
Accrued expenses	6,700,612	351,153
Net cash used in operating activities	(1,291,809)	(534,723)
Cash Flows from Investing Activities:
Cash withdrawn from Trust Account for working capital purposes	1,230,308	27,010
Cash withdrawn from Trust Account in connection with redemption	480,946,296	0
Net cash provided by (used in) investing activities	482,176,604	27,010
Cash Flows from Financing Activities:
Proceeds from convertible promissory note - related party	350,000	500,000
Redemption of common stock	(480,946,296)	0
Net cash (used in) provided by financing activities	(480,596,296)	500,000
Net (decrease) increase in cash	288,499	(7,713)
Cash - beginning of the period	22,339	93,599
Cash - end of the period	310,838	85,886
Supplemental disclosure of noncash investing and financing activities:
Increase in value of Class A common stock subject to possible redemption	135,254	2,765,952
Reduction in deferred underwriting fee payable	$ 9,702,408	$ 0

BALANCE SHEETS (FY)

BALANCE SHEETS (FY)	Dec. 31, 2021 USD ($)
Current assets:
Cash	$ 93,599
Prepaid expenses	568,058
Total current assets	661,657
Investments held in Trust Account	483,012,312
Other assets	47,083
Total Assets	483,721,052
Current liabilities:
Accounts payable	73,405
Total current liabilities	163,692
Deferred legal fees	250,000
Deferred underwriting commissions	16,905,000
Convertible working capital loan - related party	$ 0
Notes Payable, Noncurrent, Related Party, Type [Extensible Enumeration]	Related Party [Member]
Derivative warrant liabilities	$ 14,301,100
Total liabilities	31,619,792
Commitments and Contingencies
Class A ordinary shares: 48,300,000 and no shares subject to possible redemption at $10,09 and $10,00 per share at December 31, 2022 and 2021, respectively	483,000,000
Shareholders' Deficit:
Preference shares, $0,0001 par value: 5,000,000 shares authorized; none issued and outstanding at December 31, 2022 and 2021, respectively	0
Additional paid-in capital	0
Accumulated deficit	(30,899,948)
Total shareholders' deficit	(30,898,740)
Total Liabilities, Class A Ordinary Shares Subject to Possible Redemption and Shareholders' Deficit	483,721,052
Nonrelated Party [Member]
Current liabilities:
Accrued expenses	90,287
Related Party [Member]
Current liabilities:
Accrued expenses	0
Class A Common Stock
Shareholders' Deficit:
Common Stock	0
Class B Common Stock
Shareholders' Deficit:
Common Stock	$ 1,208

BALANCE SHEETS (FY) (Parentheti

BALANCE SHEETS (FY) (Parenthetical) - $ / shares	Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2021	Feb. 09, 2021	Jan. 30, 2021
Preferred stock, par value (per share)	$ 0.0001	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	5,000,000	5,000,000	5,000,000
Preferred stock, shares issued	0	0	0
Preferred stock, shares outstanding	0	0	0
Class A Common Stock Subject to Redemption
Temporary Equity, Shares Outstanding	635,778	48,300,000	0
Purchase price, per unit (in dollars per share)	$ 10	$ 10.09	$ 10
Class A Common Stock
Common shares, par value (in dollars per share)	$ 0.0001	$ 0.0001	$ 0.0001
Common shares, shares authorized	500,000,000	500,000,000	500,000,000
Temporary Equity, Shares Outstanding	635,778	48,300,000	48,300,000
Class B Common Stock
Common shares, par value (in dollars per share)	$ 0.0001	$ 0.0001	$ 0.0001
Common shares, shares authorized	50,000,000	50,000,000	50,000,000
Common shares, shares issued	12,075,000	12,075,000	12,075,000	10,062,500
Common shares, shares outstanding	12,075,000	12,075,000	12,075,000	10,062,500	12,075,000

STATEMENTS OF INCOME (FY)

STATEMENTS OF INCOME (FY) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
General and administrative expenses	$ 2,188,743	$ 1,842,337
Loss from operations	(2,188,743)	(1,842,337)
Other income (expense)
Change in fair value of derivative liabilities	13,772,685	9,503,810
Financing costs - warrant liabilities	0	(734,320)
Interest income	193	54
Interest expense	(7,885)	0
Unrealized gain on investments held in Trust Account	4,299,827	50,412
Total other (expense) income, net	18,064,820	8,819,956
Net (loss) income	$ 15,876,077	$ 6,977,619
Weighted average Class B ordinary shares, basic	12,075,000	11,906,712
Weighted average Class B ordinary shares, diluted	12,075,000	11,906,712
Basic net income per ordinary share	$ 0.26	$ 0.13
Diluted net income per ordinary share	$ 0.26	$ 0.13
Common Stock Subject to Redemption [Member]
Other income (expense)
Weighted average Class A ordinary shares, basic	48,300,000	43,139,178
Weighted average Class A ordinary shares, diluted	48,300,000	43,139,178
Basic net income per ordinary share	$ 0.26	$ 0.13
Diluted net income per ordinary share	$ 0.26	$ 0.13

STATEMENTS OF CHANGES IN SHAREH

STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (FY) - USD ($)	Total	Additional Paid-in Capital	Accumulated Deficit	Class A Common Stock	Class A Common Stock Ordinary Shares	Class B Common Stock	Class B Common Stock Ordinary Shares
Balance at the beginning at Dec. 31, 2020	$ 10,221	$ 23,792	$ (14,779)		$ 0		$ 1,208
Balance at the beginning (in shares) at Dec. 31, 2020					0		12,075,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Excess purchase price above fair value of private placement warrants	1,383,265	1,383,265
Remeasurement adjustment of Class A ordinary shares subject to possible redemption	(39,269,845)	(1,407,057)	(37,862,788)
Net income	6,977,619		6,977,619	$ 5,468,324		$ 1,509,295
Balance at the end at Dec. 31, 2021	(30,898,740)	0	(30,899,948)		$ 0		$ 1,208
Balance at the end (in shares) at Dec. 31, 2021					0		12,075,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,775,190	0	5,775,190		$ 0		$ 0
Balance at the end at Mar. 31, 2022	(25,123,550)	0	(25,124,758)		$ 0		$ 1,208
Balance at the end (in shares) at Mar. 31, 2022					0		12,075,000
Balance at the beginning at Dec. 31, 2021	(30,898,740)	0	(30,899,948)		$ 0		$ 1,208
Balance at the beginning (in shares) at Dec. 31, 2021					0		12,075,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	13,646,911			10,917,529		2,729,382
Balance at the end at Sep. 30, 2022	(20,017,781)	0	(20,018,989)		$ 0		$ 1,208
Balance at the end (in shares) at Sep. 30, 2022					0		12,075,000
Balance at the beginning at Dec. 31, 2021	(30,898,740)	0	(30,899,948)		$ 0		$ 1,208
Balance at the beginning (in shares) at Dec. 31, 2021					0		12,075,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Remeasurement adjustment of Class A ordinary shares subject to possible redemption	(4,168,822)		(4,168,822)
Net income	15,876,077		15,876,077	12,700,862		3,175,215
Balance at the end at Dec. 31, 2022	(19,191,485)	0	(19,192,693)		$ 0		$ 1,208
Balance at the end (in shares) at Dec. 31, 2022					0		12,075,000
Balance at the beginning at Mar. 31, 2022	(25,123,550)	0	(25,124,758)		$ 0		$ 1,208
Balance at the beginning (in shares) at Mar. 31, 2022					0		12,075,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,684,896	0	6,684,896		$ 0		$ 0
Balance at the end at Jun. 30, 2022	(19,024,609)	0	(19,025,817)		$ 0		$ 1,208
Balance at the end (in shares) at Jun. 30, 2022					0		12,075,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,186,825	0	1,186,825	949,460	$ 0	237,365	$ 0
Balance at the end at Sep. 30, 2022	(20,017,781)	0	(20,018,989)		$ 0		$ 1,208
Balance at the end (in shares) at Sep. 30, 2022					0		12,075,000
Balance at the beginning at Dec. 31, 2022	(19,191,485)	0	(19,192,693)		$ 0		$ 1,208
Balance at the beginning (in shares) at Dec. 31, 2022					0		12,075,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	(2,780,733)	0	(2,780,733)		$ 0		$ 0
Balance at the end at Mar. 31, 2023	(23,390,077)	0	(23,391,285)		$ 0		$ 1,208
Balance at the end (in shares) at Mar. 31, 2023					0		12,075,000
Balance at the beginning at Dec. 31, 2022	(19,191,485)	0	(19,192,693)		$ 0		$ 1,208
Balance at the beginning (in shares) at Dec. 31, 2022					0		12,075,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	(7,775,789)			(1,450,300)		(6,325,489)
Balance at the end at Sep. 30, 2023	(17,400,120)	9,585,984	(26,987,312)		$ 0		$ 1,208
Balance at the end (in shares) at Sep. 30, 2023					0		12,075,000
Balance at the beginning at Mar. 31, 2023	(23,390,077)	0	(23,391,285)		$ 0		$ 1,208
Balance at the beginning (in shares) at Mar. 31, 2023					0		12,075,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	(3,248,492)	0	(3,248,492)		$ 0		$ 0
Balance at the end at Jun. 30, 2023	(15,537,132)	9,702,408	(25,240,748)		$ 0		$ 1,208
Balance at the end (in shares) at Jun. 30, 2023					0		12,075,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	(1,746,564)	0	(1,746,564)	$ (101,278)	$ 0	$ (1,645,286)	$ 0
Balance at the end at Sep. 30, 2023	$ (17,400,120)	$ 9,585,984	$ (26,987,312)		$ 0		$ 1,208
Balance at the end (in shares) at Sep. 30, 2023					0		12,075,000

STATEMENTS OF CASH FLOWS (FY)

STATEMENTS OF CASH FLOWS (FY) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Cash Flows from Operating Activities:
Net income (loss)	$ 15,876,077	$ 6,977,619
Adjustments to reconcile net income to net cash used in operating activities:
Change in fair value of derivative liabilities	(13,772,685)	(9,503,810)
Financing costs - warrant liabilities	0	734,320
Interest expense	7,885	0
Unrealized gain on investments held in Trust Account	(4,299,827)	(50,412)
Changes in operating assets and liabilities:
Prepaid expenses and other assets	564,249	(604,920)
Accounts payable	80,166	73,405
Accrued expenses	809,558	20,287
Accrued expenses - related party	120,000	0
Net cash used in operating activities	(614,577)	(2,353,511)
Cash Flows from Investing Activities:
Cash deposited in Trust Account	0	(483,000,000)
Cash withdrawn from Trust Account	43,317	38,100
Net cash provided by (used in) investing activities	43,317	(482,961,900)
Cash Flows from Financing Activities:
Proceeds from note payable to related party	0	30,212
Repayment of note payable to related party	0	(135,000)
Proceeds from convertible working capital loan	500,000	0
Proceeds received from initial public offering, gross	0	483,000,000
Proceeds received from private placement	0	12,324,495
Offering costs paid	0	(9,810,697)
Net cash (used in) provided by financing activities	500,000	485,409,010
Net (decrease) increase in cash	(71,260)	93,599
Cash - beginning of the period	93,599
Cash - end of the period	22,339	93,599
Supplemental disclosure of noncash investing and financing activities:
Increase in redemption value of Class A ordinary shares subject to possible redemption	4,168,822	0
Offering costs included in accrued expenses	0	45,000
Offering costs paid by related party under promissory note	0	104,788
Deferred legal fees	0	250,000
Deferred underwriting commissions	0	16,905,000
Remeasurement of Class A ordinary shares to redemption amount	$ 0	$ 39,269,845

Description of Organization and

Description of Organization and Business Operations (Q3)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Organization and Business Operations	Note 1-Description of Organization and Business Operations RMG Acquisition Corp. III (the “Company”) is a blank check company, also referred to as a special purpose acquisition company, incorporated as a Cayman Islands exempted company on December 23, 2020. The Company was incorporated for the purpose of effecting a merger, share exchange, asset acquisition, share purchase, reorganization or similar business combination with one or more businesses that the Company has not yet identified (“Business Combination”). As of September 30, 2023, the Company had not yet commenced operations. All activity for the period from December 23, 2020 (inception) through September 30, 2023 relates to the Company’s formation and the initial public offering (the “Initial Public Offering”), and identifying a target company for an initial Business Combination, which is described below. The Company will not generate any operating revenues until after the completion of its initial Business Combination, at the earliest. The Company will generate non-operating income in the form of interest income on cash and cash equivalents from the proceeds derived from the Initial Public Offering. The Company has selected December 31 as its fiscal year end. The Company’s sponsor is RMG Sponsor III, LLC, a Delaware limited liability company (the “Sponsor”). The registration statement for the Company’s Initial Public Offering was declared effective on February 4, 2021. On February 9, 2021, the Company consummated its Initial Public Offering of 48,300,000 units (the “Units” and, with respect to the Class A ordinary shares included in the Units being offered, the “Public Shares”), including 6,300,000 additional Units to cover over-allotments (the “Over-Allotment Units”), at $10.00 per Unit, generating gross proceeds of $483.0 million, and incurring offering costs of approximately $27.1 million, of which approximately $16.9 million was for deferred underwriting commissions and $250,000 was for deferred legal fees (Note 7). Simultaneously with the closing of the Initial Public Offering, the Company consummated the private placement (“Private Placement”) of 8,216,330 warrants (each, a “Private Placement Warrant” and collectively, the “Private Placement Warrants”) at a price of $1.50 per Private Placement Warrant to the Sponsor, generating proceeds of approximately $12.3 million (Note 5). Upon the closing of the Initial Public Offering and the Private Placement, $483.0 million ($10.00 per Unit) of the net proceeds of the Initial Public Offering and certain of the proceeds of the Private Placement was placed in a trust account (“Trust Account”) with Continental Stock Transfer & Trust Company acting as trustee and have been invested in United States government treasury bills with a maturity of 185 days or less or in money market funds investing solely in U.S. Treasuries and meeting certain conditions under Rule 2a-7 under the Investment Company Act 1940, as amended, or the Investment Company Act, as determined by the Company, until the earlier of: (i) the completion of a Business Combination and (ii) the distribution of the Trust Account as described below. The Company’s management has broad discretion with respect to the specific application of the net proceeds of its Initial Public Offering and the sale of Private Placement Warrants, although substantially all of the net proceeds are intended to be applied generally toward consummating a Business Combination. The Company’s initial Business Combination must be with one or more operating businesses or assets with a fair market value equal to at least 80% of the net assets held in the Trust Account (excluding the deferred underwriting commissions and taxes payable on the income earned on the Trust Account) at the time the Company signs a definitive agreement in connection with the initial Business Combination. However, the Company will only complete a Business Combination if the post-transaction company owns or acquires 50% or more of the outstanding voting securities of the target or otherwise acquires a controlling interest in the target sufficient for it not to be required to register as an investment company under the Investment Company Act. The Company will provide its holders of Public Shares (the “Public Shareholders”) with the opportunity to redeem all or a portion of their Public Shares upon the completion of a Business Combination either (i) in connection with a shareholder meeting called to approve the Business Combination or (ii) by means of a tender offer. The decision as to whether the Company will seek shareholder approval of a Business Combination or conduct a tender offer will be made by the Company, solely in its discretion. The Public Shareholders will be entitled to redeem their Public Shares for a pro rata portion of the amount then in the Trust Account (initially anticipated to be $10.00 per share, plus any pro rata interest earned on the funds held in the Trust Account and not previously released to the Company to pay its tax obligations, expenses relating to the administration of the Trust Account and withdrawals for working capital). The per-share amount to be distributed to Public Shareholders who redeem their Public Shares will not be reduced by the deferred underwriting commissions the Company will pay to the underwriters (as discussed in Note 7). These Public Shares will be recorded at a redemption value and classified as temporary equity upon the completion of the Initial Public Offering, in accordance with the Financial Accounting Standards Board’s (“FASB”) Accounting Standards Codification (“ASC”) Topic 480 “Distinguishing Liabilities from Equity” (“ASC 480”). In such case, the Company will proceed with a Business Combination if the Company has net tangible assets of at least $5,000,001 upon such consummation of a Business Combination and a majority of the shares voted are voted in favor of the Business Combination. If a shareholder vote is not required by law and the Company does not decide to hold a shareholder vote for business or other legal reasons, the Company will, pursuant to the amended and restated memorandum and articles of association which will be adopted by the Company upon the consummation of the Initial Public Offering (the “Amended and Restated Memorandum and Articles of Association”), conduct the redemptions pursuant to the tender offer rules of the U.S. Securities and Exchange Commission (the “SEC”), and file tender offer documents with the SEC prior to completing a Business Combination. If, however, a shareholder approval of the transactions is required by law, or the Company decides to obtain shareholder approval for business or legal reasons, the Company will offer to redeem shares in conjunction with a proxy solicitation pursuant to the proxy rules and not pursuant to the tender offer rules. Additionally, each Public Shareholder may elect to redeem their Public Shares irrespective of whether they vote for or against the proposed transaction. If the Company seeks shareholder approval in connection with a Business Combination, the holders of the Founder Shares prior to this Initial Public Offering (the “Initial Shareholders”) agreed to vote their Founder Shares (as defined in Note 6) and any Public Shares purchased during or after the Initial Public Offering in favor of a Business Combination. In addition, the Initial Shareholders agreed to waive their redemption rights with respect to their Founder Shares and Public Shares in connection with the completion of a Business Combination. In addition, the Company agreed not to enter into a definitive agreement regarding an initial Business Combination without the prior consent of the Sponsor. Notwithstanding the foregoing, the Company’s Amended and Restated Memorandum and Articles of Association will provide that a Public Shareholder, together with any affiliate of such shareholder or any other person with whom such shareholder is acting in concert or as a “group” (as defined under Section 13 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”)), will be restricted from redeeming its shares with respect to more than an aggregate of 15% or more of the Class A ordinary shares sold in the Initial Public Offering, without the prior consent of the Company. The Company’s Sponsor, executive officers and directors agreed not to propose an amendment to the Company’s Amended and Restated Memorandum and Articles of Association that would affect the substance or timing of the Company’s obligation to provide for the redemption of its Public Shares in connection with a Business Combination or to redeem 100% of its Public Shares if the Company does not complete a Business Combination, unless the Company provides the Public Shareholders with the opportunity to redeem their Class A ordinary shares in conjunction with any such amendment. On January 11, 2023, the Company held an extraordinary general meeting of shareholders for the purpose of approving an amendment to the amended and restated memorandum and articles of association to extend the date by which the Company must complete a Business Combination from February 9, 2023, to May 9, 2023 (the “Extended Date”), and to allow the Company, without another shareholder vote, to elect to further extend the date to consummate a Business Combination up to three times by an additional month each time after the Extended Date, upon two days’ advance notice prior to the applicable deadline, for a total of up to six months, to August 9, 2023, if the Company had entered into a definitive business combination agreement (the “First Extension”). In connection with the First Extension, holders of 47,381,598 Class A ordinary shares elected to redeem their Class A ordinary shares for an aggregate of approximately $478 million in cash. On August 4, 2023, the Company held an extraordinary general meeting for the purpose of approving an amendment and restatement of the amended and restated memorandum and articles of association to extend the date by which the Company must complete a Business Combination from August 9, 2023 to February 9, 2024 (the “Second Extension”). In addition, the shareholders approved the proposal to amend and restate the Company’s charter to eliminate the limitation that the Company shall not redeem public shares to the extent that such redemptions would cause the Company’s net tangible assets to be less than $5,000,001 following such redemptions. In connection with the Second Extension, holders of 282,624 Class A ordinary shares elected to redeem their Class A ordinary shares for an aggregate of approximately $3 million in cash. If the Company is unable to complete a Business Combination by February 9, 2024, (the “Combination Period”), the Company will (1) cease all operations except for the purpose of winding up; (2) as promptly as reasonably possible but not more than 10 business days thereafter, redeem the Public Shares, at a per-share price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account, including interest (less up to $100,000 of interest to pay dissolution expenses and which interest shall be net of taxes payable, expenses relating to the administration of the Trust Account and limited withdrawals for working capital), divided by the number of then issued and outstanding Public Shares, which redemption will completely extinguish Public Shareholders’ rights as shareholders (including the right to receive further liquidating distributions, if any); and (3) as promptly as reasonably possible following such redemption, subject to the approval of the remaining shareholders and the board of directors, liquidate and dissolve, subject in each case to the Company’s obligations under Cayman Islands law to provide for claims of creditors and the requirements of other applicable law. The Initial Shareholders agreed to waive their liquidation rights with respect to the Founder Shares if the Company fails to complete a Business Combination within the Combination Period. However, if the Initial Shareholders should acquire Public Shares in or after the Initial Public Offering, they will be entitled to liquidating distributions from the Trust Account with respect to such Public Shares if the Company fails to complete a Business Combination within the Combination Period. The underwriters agreed to waive their rights to their deferred underwriting commission (see Note 7) held in the Trust Account in the event the Company does not complete a Business Combination within the Combination Period and, in such event, such amounts will be included with the funds held in the Trust Account that will be available to fund the redemption of the Company’s Public Shares. In the event of such distribution, it is possible that the per share value of the residual assets remaining available for distribution (including Trust Account assets) will be only $10.00 per share initially held in the Trust Account. In order to protect the amounts held in the Trust Account, the Sponsor agreed that it will be liable to the Company if and to the extent any claims by a third party for services rendered or products sold to the Company, or a prospective target business with which the Company has entered into a written letter of intent, confidentiality or other similar agreement or business combination agreement, reduce the amount of funds in the Trust Account to below the lesser of (i) $10.00 per Public Share and (ii) the actual amount per Public Share held in the Trust Account as of the date of the liquidation of the Trust Account, if less than $10.00 per share due to reductions in the value of the trust assets, less taxes payable, expenses relating to the administration of the Trust Account and limited withdrawals for working capital, provided that such liability will not apply to any claims by a third party or prospective target business who executed a waiver of any and all rights to the monies held in the Trust Account (whether or not such waiver is enforceable) nor will it apply to any claims under the Company’s indemnity of the underwriters of the Initial Public Offering against certain liabilities, including liabilities under the Securities Act of 1933, as amended (the “Securities Act”). In the event that an executed waiver is deemed to be unenforceable against a third party, the Sponsor will not be responsible to the extent of any liability for such third-party claims. The Company will seek to reduce the possibility that the Sponsor will have to indemnify the Trust Account due to claims of creditors by endeavoring to have vendors, service providers (except the Company’s independent registered public accounting firm), prospective target businesses or other entities with which the Company does business, execute agreements with the Company waiving any right, title, interest or claim of any kind in or to monies held in the Trust Account. On June 20, 2023, the Company received a written notice (the “Notice”) from the Listing Qualifications Department (the “Staff”) of The Nasdaq Stock Market LLC (“Nasdaq”) notifying the Company that, for the last 30 consecutive business days, the Company’s Market Value of Listed Securities (“MVLS”) was below the minimum of $35 million required for continued listing on the Nasdaq Capital Market pursuant to Nasdaq Listing Rule 5550(b)(2) (the “Market Value Standard”). The Staff also noted that the Company does not meet the requirements under Nasdaq Listing Rules 5550(b)(1) (Equity Standard) and 5550(b)(3) (Net Income Standard). The Notice does not impact the listing of the Company’s Class A ordinary shares par value $0.0001 per share (“Class A ordinary shares”), on the Nasdaq Capital Market at this time. The Notice provided that, in accordance with Nasdaq Listing Rule 5810(c)(3)(C) (the “Compliance Period Rule”), the Company has a period of 180 calendar days from the date of the Notice, or until December 18, 2023 (the “Compliance Date”), to regain compliance with the Market Value Standard. During this period, Class A ordinary shares will continue to trade on the Nasdaq Capital Market. If at any time before the Compliance Date the Company’s MVLS closes at or above $35 million for a minimum of 10 consecutive business days as required under the Compliance Period Rule, the Staff will provide written notification to the Company that it has regained compliance with the Market Value Standard and will close the matter (unless the Staff exercises its discretion to extend this 10 business day period pursuant to Nasdaq Listing Rule 5810(c)(3)(H)). If the Company does not regain compliance with the Market Value Standard by the Compliance Date, the Staff will provide a written notification to the Company that Class A ordinary shares will be subject to delisting. At that time, the Company may appeal the Staff’s delisting determination to a Hearings Panel (the “Panel”). However, there can be no assurance that, if the Company receives a delisting notice and appeals the delisting determination by the Staff to the Panel, such appeal would be successful. The Company intends to monitor its MVLS between now and the Compliance Date, and may, if appropriate, evaluate available options to resolve the deficiency under the Market Value Standard and regain compliance with the Market Value Standard. The Company may also try to comply with another Nasdaq listing criteria, such as the one under Nasdaq Listing Rule 5550(b)(1) (Equity Standard). However, there can be no assurance that the Company will be able to regain or maintain compliance with Nasdaq listing criteria. Going Concern As of September 30, 2023, the Company had approximately $311,000 in its operating bank account and a working capital deficit of approximately $7.5 million. Further, the Company has incurred and expects to continue to incur significant costs in pursuit of its financing and acquisition plans. These factors, among others, raise substantial doubt about the Company’s ability to continue as a going concern within one year after the date that the unaudited condensed financial statements are issued. The Company’s liquidity needs to date have been satisfied through a payment of $25,000 from Sponsor to cover certain expenses in exchange for the issuance of the Founder Shares (as defined in Note 4), the loan of $135,000 from the Sponsor pursuant to the Note (as defined in Note 4), the proceeds from the consummation of the Private Placement not held in the Trust Account, and the funds withdrawn from the Trust Account for working capital purposes. The Company fully repaid the Note on February 12, 2021. In addition, in order to finance transaction costs in connection with a Business Combination, the Sponsor or an affiliate of the Sponsor, or certain of the Company’s officers and directors may provide the Company Working Capital Loans (as defined in Note 4). As of September 30, 2023 and December 31, 2022, there was $850,000 and $500,000, respectively, outstanding under Working Capital Loans. Pursuant to the Investment Management Trust Agreement between the Company and Continental Stock Transfer & Trust Company, dated as of February 4, 2021 (the “Investment Management Trust Agreement”), the Company is permitted to withdraw funds for working capital requirements. These permitted withdrawals are limited to only the interest available that has been earned in excess of the initial deposit at the Initial Public Offering. As of September 30, 2023, the Company has earned a total of $5,913,216 of investment income from the Trust Account, of which a total of $4,304,076 has been withdrawn to redeeming shareholders and a total of $1,311,725 has been withdrawn for working capital purposes. As of September 30, 2023 and December 31, 2022, the Company withdrew $1,230,308 and $43,317, respectively, for working capital purposes. In connection with the Company’s assessment of going concern considerations in accordance with FASB ASC Topic 205-40, “Presentation of Financial Statements-Going Concern,” management has determined that the working capital deficit and the mandatory liquidation date and subsequent dissolution raises substantial doubt about the Company’s ability to continue as a going concern. If the Company is unable to complete a Business Combination by February 9, 2024, then the Company will cease all operations except for the purpose of liquidating. No adjustments have been made to the carrying amounts of assets or liabilities should we be required to liquidate after February 9, 2024. The unaudited condensed financial statements do not include any adjustment that might be necessary if the Company is unable to continue as a going concern.	Note 1-Description of Organization and Business Operations RMG Acquisition Corp. III (the “ Company SPAC Business Combination As of December 31, 2022, the Company had not yet commenced operations. All activity for the period from December 23, 2020 (inception) through December 31, 2022 relates to the Company’s formation and the initial public offering (the “ Initial Public Offering The Company’s sponsor is RMG Sponsor III, LLC, a Delaware limited liability company (the “ Sponsor Over-Allotment Units Simultaneously with the closing of the Initial Public Offering, the Company consummated the private placement (“ Private Placement Private Placement Warrant Private Placement Warrants Upon the closing of the Initial Public Offering and the Private Placement, $483.0 million ($10.00 per Unit) of the net proceeds of the Initial Public Offering and certain of the proceeds of the Private Placement was placed in a trust account (“ Trust Account The Company’s management has broad discretion with respect to the specific application of the net proceeds of its Initial Public Offering and the sale of Private Placement Warrants, although substantially all of the net proceeds are intended to be applied generally toward consummating a Business Combination. The Company’s initial Business Combination must be with one or more operating businesses or assets with a fair market value equal to at least 80% of the net assets held in the Trust Account (excluding the deferred underwriting commissions and taxes payable on the income earned on the Trust Account) at the time the Company signs a definitive agreement in connection with the initial Business Combination. However, the Company will only complete a Business Combination if the post-transaction company owns or acquires 50% or more of the outstanding voting securities of the target or otherwise acquires a controlling interest in the target sufficient for it not to be required to register as an investment company under the Investment Company Act. The Company will provide its holders of Public Shares (the “ Public Shareholders not previously released to the Company to pay its tax obligations, expenses relating to the administration of the trust account and limited withdrawals for working capital). The per-share amount to be distributed to Public Shareholders who redeem their Public Shares will not be reduced by the deferred underwriting commissions the Company will pay to the underwriters (as discussed in Note 7). These Public Shares will be recorded at a redemption value and classified as temporary equity upon the completion of the Initial Public Offering, in accordance with the Financial Accounting Standards Board’s (“ FASB ASC ASC 480 Amended and Restated Memorandum and Articles of Association SEC Initial Shareholders Notwithstanding the foregoing, the Company’s Amended and Restated Memorandum and Articles of Association will provide that a Public Shareholder, together with any affiliate of such shareholder or any other person with whom such shareholder is acting in concert or as a “group” (as defined under Section 13 of the Securities Exchange Act of 1934, as amended (the “ Exchange Act The Company’s Sponsor, executive officers and directors agreed not to propose an amendment to the Company’s Amended and Restated Memorandum and Articles of Association that would affect the substance or timing of the Company’s obligation to provide for the redemption of its Public Shares in connection with a Business Combination or to redeem 100% of its Public Shares if the Company does not complete a Business Combination, unless the Company provides the Public Shareholders with the opportunity to redeem their Class A ordinary shares in conjunction with any such amendment. If the Company is unable to complete a Business Combination by May 9, 2023 or, if the Company has entered into a definitive business combination agreement, August 9, 2023, (the “ Combination Period The Initial Shareholders agreed to waive their liquidation rights with respect to the Founder Shares if the Company fails to complete a Business Combination within the Combination Period. However, if the Initial Shareholders should acquire Public Shares in or after the Initial Public Offering, they will be entitled to liquidating distributions from the Trust Account with respect to such Public Shares if the Company fails to complete a Business Combination within the Combination Period. The underwriters agreed to waive their rights to their deferred underwriting commission (see Note 7) held in the Trust Account in the event the Company does not complete a Business Combination within the Combination Period and, in such event, such amounts will be included with the funds held in the Trust Account that will be available to fund the redemption of the Company’s Public Shares. In the event of such distribution, it is possible that the per share value of the residual assets remaining available for distribution (including Trust Account assets) will be only $10.00 per share initially held in the Trust Account. In order to protect the amounts held in the Trust Account, the Sponsor agreed that it will be liable to the Company if and to the extent any claims by a third party for services rendered or products sold to the Company, or a prospective target business with which the Company has entered into a written letter of intent, confidentiality or other similar agreement or business combination agreement, reduce the amount of funds in the Trust Account to below the lesser of (i) $10.00 per Public Share and (ii) the actual amount per Public Share held in the Trust Account as of the date of the liquidation of the Trust Account, if less than $10.00 per share due to reductions in the value of the trust assets, less taxes payable, expenses relating to the administration of the trust account and limited withdrawals for working capital, provided that such liability will not apply to any claims by a third party or prospective target business who executed a waiver of any and all rights to the monies held in the Trust Account (whether or not such waiver is enforceable) nor will it apply to any claims under the Company’s indemnity of the underwriters of the Initial Public Offering against certain liabilities, including liabilities under the Securities Act of 1933, as amended (the “ Securities Act Going Concern As of December 31, 2022, the Company had approximately $22,000 in its operating bank account and a working capital deficit of approximately $1.1 million. Further, the Company has incurred and expects to continue to incur significant costs in pursuit of its financing and acquisition plans. These factors, among others, raise substantial doubt about the Company’s ability to continue as a going concern within one year after the date that the financial statements are issued. The Company’s liquidity needs to date have been satisfied through a payment of $25,000 from Sponsor to cover certain expenses in exchange for the issuance of the Founder Shares (as defined in Note 4), the loan of $135,000 from the Sponsor pursuant to the Note (as defined in Note 4), and the proceeds from the consummation of the Private Placement not held in the Trust Account. The Company fully repaid the Note on February 12, 2021. In addition, in order to finance transaction costs in connection with a Business Combination, the Sponsor or an affiliate of the Sponsor, or certain of the Company’s officers and directors may provide the Company Working Capital Loans (as defined in Note 4). As of December 31, 2022 and 2021, there was $500,000 and $0, respectively, outstanding under any Working Capital Loan. In connection with the Company’s assessment of going concern considerations in accordance with FASB ASC Topic 205-40, “Presentation of Financial Statements-Going Concern,” management has determined that the working capital deficit and the mandatory liquidation date and subsequent dissolution raises substantial doubt about the Company’s ability to continue as a going concern. If the Company is unable to complete a business combination by May 9, 2023 (unless such a period is extended as described herein), then the Company will cease all operations except for the purpose of liquidating. No adjustments have been made to the carrying amounts of assets or liabilities should we be required to liquidate after May 9, 2023 or, if we have entered into a definitive business combination agreement, August 9, 2023. The financial statements do not include any adjustment that might be necessary if the Company is unable to continue as a going concern.

Summary of Significant Accounti

Summary of Significant Accounting Policies (Q3)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Summary of Significant Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Note 2-Summary of Significant Accounting Policies Basis of Presentation The accompanying unaudited condensed financial statements of the Company are presented in U.S. dollars and have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information and Article 10 of Regulation S-X. Accordingly, certain disclosures included in the annual financial statements have been condensed or omitted from these financial statements as they are not required for interim financial statements under GAAP and the rules of the SEC. In the opinion of management, the unaudited condensed financial statements reflect all adjustments, which include only normal recurring adjustments necessary for the fair statement of the balances and results for the periods presented. Operating results for the three and nine months ended September 30, 2023 are not necessarily indicative of the results that may be expected for the year ended December 31, 2023. The accompanying unaudited condensed financial statements should be read in conjunction with the audited financial statements and notes thereto included in the Annual Report on Form 10-K filed by the Company with the SEC on April 18, 2023. Emerging Growth Company The Company is an “emerging growth company,” as defined in Section 2(a) of the Securities Act, as modified by the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”), and it may take advantage of certain exemptions from various reporting requirements that are applicable to other public companies that are not emerging growth companies including, but not limited to, not being required to comply with the independent registered public accounting firm attestation requirements of Section 404 of the Sarbanes-Oxley Act, reduced disclosure obligations regarding executive compensation in its periodic reports and proxy statements, and exemptions from the requirements of holding a nonbinding advisory vote on executive compensation and shareholder approval of any golden parachute payments not previously approved. Further, Section 102(b)(1) of the JOBS Act exempts emerging growth companies from being required to comply with new or revised financial accounting standards until private companies (that is, those that have not had a Securities Act registration statement declared effective or do not have a class of securities registered under the Exchange Act) are required to comply with the new or revised financial accounting standards. The JOBS Act provides that an emerging growth company can elect to opt out of the extended transition period and comply with the requirements that apply to non-emerging growth companies but any such an election to opt out is irrevocable. The Company has elected not to opt out of such extended transition period, which means that when a standard is issued or revised and it has different application dates for public or private companies, the Company, as an emerging growth company, can adopt the new or revised standard at the time private companies adopt the new or revised standard. This may make comparison of the Company’s financial statement with another public company that is neither an emerging growth company nor an emerging growth company that has opted out of using the extended transition period difficult or impossible because of the potential differences in accounting standards used. Concentration of Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist of cash accounts in a financial institution, which, at times, may exceed the Federal Depository Insurance Coverage limit of $250,000. As of September 30, 2023 and December 31, 2022, the Company has not experienced losses on these accounts and management believes the Company is not exposed to significant risks on such accounts. Cash and Cash Equivalents The Company considers all short-term investments with an original maturity of three months or less when purchased to be cash equivalents. The Company had no cash equivalents as of September 30, 2023 and December 31, 2022. Cash and Investments Held in Trust Account The Company’s portfolio of investments is comprised of cash and U.S. government securities, within the meaning set forth in Section 2(a)(16) of the Investment Company Act, with a maturity of 185 days or less, or investments in money market funds that invest in U.S. government securities and generally have a readily determinable fair value, or a combination thereof. Cash held in the Trust Account is in a demand deposit account that accrues interest monthly. When the Company’s investments held in the Trust Account are comprised of U.S. government securities, the investments are classified as trading securities. When the Company’s investments held in the Trust Account are comprised of money market funds, the investments are recognized at fair value. Trading securities and investments in money market funds are presented on the balance sheets at fair value at the end of each reporting period. Gains and losses resulting from the change in fair value of these securities is included in unrealized gain on investments held in Trust Account in the accompanying statements of operations. The estimated fair values of investments held in the Trust Account are determined using available market information, other than for investments in open-ended money market funds with published daily net asset values (“NAV”), in which case the Company uses NAV as a practical expedient to fair value. The NAV on these investments is typically held constant at $1.00 per unit. The Trust Account may also contain balances of cash as result of investment activity. Use of Estimates The preparation of unaudited condensed financial statements in conformity with U.S. GAAP requires the Company’s management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statement. Making estimates requires management to exercise significant judgment. It is at least reasonably possible that the estimate of the effect of a condition, situation or set of circumstances that existed at the date of the financial statement, which management considered in formulating its estimate, could change in the near term due to one or more future confirming events. Accordingly, the actual results could differ significantly from those estimates. Fair Value of Financial Instruments The fair value of the Company’s assets and liabilities, which qualify as financial instruments under the FASB ASC Topic 820, “Fair Value Measurements,” approximates the carrying amounts represented in the balance sheet. Fair Value Measurements Fair value is defined as the price that would be received for sale of an asset or paid for transfer of a liability, in an orderly transaction between market participants at the measurement date. GAAP establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). These tiers include: • Level 1, defined as observable inputs such as quoted prices for identical instruments in active markets; • Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable such as quoted prices for similar instruments in active markets or quoted prices for identical or similar instruments in markets that are not active; and • Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions, such as valuations derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable. In some circumstances, the inputs used to measure fair value might be categorized within different levels of the fair value hierarchy. In those instances, the fair value measurement is categorized in its entirety in the fair value hierarchy based on the lowest level input that is significant to the fair value measurement. Working Capital Loan Option On January 19, 2022, the Sponsor agreed to loan the Company up to $500,000 to be used for a portion of the expenses of the Company. On July 27, 2022, the Sponsor agreed to loan the Company up to $475,000. The notes are due upon consummation of our Business Combination, without interest. At the option of the Sponsor, the outstanding principle of the notes may be converted into that number of warrants (“Conversion Warrants”) equal to the outstanding principle of the note divided by $1.50. The option (“Working Capital Loan Option”) to convert the working capital loans into warrants qualifies as an embedded derivative under ASC 815 and is required to be recognized at fair value with subsequent changes in fair value recognized in Company’s statements of operations each reporting period until the loan is repaid or converted. As of September 30, 2023 and December 31, 2022, the fair value of the Working Capital Loan Option was $0, and the Working Capital Loan is held at cost of $850,000 and $500,000, respectively, see Note 9. Derivative Warrant Liabilities The Company does not use derivative instruments to hedge exposures to cash flow, market, or foreign currency risks. The Company evaluates all of its financial instruments, including issued share purchase warrants, to determine if such instruments are derivatives or contain features that qualify as embedded derivatives, pursuant to FASB ASC Topic 480 and ASC Topic 815, “Derivatives and Hedging” (“ASC 815”). The classification of derivative instruments, including whether such instruments should be recorded as liabilities or as equity, is re-assessed at the end of each reporting period. The warrants issued in the Initial Public Offering (the “Public Warrants”) and the Private Placement Warrants are recognized as derivative liabilities in accordance with ASC 815. Accordingly, the Company recognizes the warrant instruments as liabilities at fair value and adjust the instruments to fair value at each reporting period. The liabilities are subject to remeasurement at each balance sheet date until exercised, and any change in fair value is recognized in the Company’s statement of operations. The fair value of warrants issued in connection with the Initial Public Offering and Private Placement were initially measured at fair value using a Monte Carlo simulation model and subsequently, the fair value of the Private Placement warrants have been estimated using a Monte Carlo simulation model each measurement date. The fair value of Warrants issued in connection with our Initial Public Offering have subsequently been measured based on the listed market price of such warrants. Offering Costs Associated with the Initial Public Offering Offering costs consisted of legal, accounting, underwriting and other costs incurred in connection with the Initial Public Offering that were directly related to the Initial Public Offering. Offering costs were allocated to the separable financial instruments issued in the Initial Public Offering based on a relative fair value basis, compared to total proceeds received. Offering costs associated with derivative warrant liabilities were expensed as incurred and presented as non-operating expenses in the statements of operations. Offering costs associated with the issuance of the Class A ordinary shares were charged against the carrying value of the Class A ordinary shares subject to possible redemption upon the completion of the Initial Public Offering. The Company classifies deferred underwriting commissions as non-current liabilities as their liquidation is not reasonably expected to require the use of current assets or require the creation of current liabilities. Class A Ordinary Shares Subject to Possible Redemption The Company accounts for its Class A ordinary shares subject to possible redemption in accordance with ASC 480. Class A ordinary shares subject to mandatory redemption (if any) are classified as liability instruments and are measured at fair value. Conditionally redeemable Class A ordinary shares (including Class A ordinary shares that feature redemption rights that are either within the control of the holder or subject to redemption upon the occurrence of uncertain events not solely within the Company’s control) are classified as temporary equity. At all other times, Class A ordinary shares are classified as shareholders’ equity. The Company’s Class A ordinary shares feature certain redemption rights that are considered to be outside of the Company’s control and subject to the occurrence of uncertain future events. Accordingly, as of September 30, 2023 and December 31, 2022, 635,778 and 48,300,000 Class A ordinary shares subject to possible redemption, respectively, are presented at redemption value as temporary equity, outside of the shareholders’ equity section of the Company’s balance sheet. Effective with the closing of the Initial Public Offering, the Company recognized the accretion from initial book value to redemption amount, which resulted in charges against additional paid-in capital (to the extent available) and accumulated deficit. Income Taxes The Company complies with the accounting and reporting requirements of ASC Topic 740, “Income Taxes” (“ASC 740”), which requires an asset and liability approach to financial accounting and reporting for income taxes. Deferred income tax assets and liabilities are computed for differences between the financial statement and tax bases of assets and liabilities that will result in future taxable or deductible amounts, based on enacted tax laws and rates applicable to the periods in which the differences are expected to affect taxable income. Valuation allowances are established, when necessary, to reduce deferred tax assets to the amount expected to be realized. ASC 740 prescribes a recognition threshold and a measurement attribute for the financial statement recognition and measurement of tax positions taken or expected to be taken in a tax return. For those benefits to be recognized, a tax position must be more-likely-than-not to be sustained upon examination by taxing authorities. The Company’s management determined that the Cayman Islands is the Company’s only major tax jurisdiction. The Company recognizes accrued interest and penalties related to unrecognized tax benefits as income tax expense. There were no unrecognized tax benefits and no amounts accrued for interest and penalties as of September 30, 2023. The Company is currently not aware of any issues under review that could result in significant payments, accruals or material deviation from its position. There is currently no taxation imposed on income by the Government of the Cayman Islands. In accordance with Cayman federal income tax regulations, income taxes are not levied on the Company. Consequently, income taxes are not reflected in the Company’s financial statement. The Company’s management does not expect that the total amount of unrecognized tax benefits will materially change over the next twelve months. Net (Loss) Income Per Ordinary Share The Company has two classes of shares issued and outstanding: Class A ordinary shares and Class B ordinary shares. Income and losses are shared pro rata between the two classes of shares. Net (loss) income per ordinary share is computed by dividing net (loss) income by the weighted-average number of ordinary shares outstanding during the periods. The Company has not considered the effect of the warrants sold in the Initial Public Offering and the Private Placement to purchase an aggregate of 17,876,330, of the Company’s Class A ordinary shares in the calculation of diluted net (loss) income per share, because their exercise is contingent upon future events and their inclusion would be anti-dilutive under the treasury stock method. As a result, diluted net (loss) income per share is the same as basic net (loss) income per share for the three and nine months ended September 30, 2023 and 2022. Accretion associated with the Class A ordinary shares subject to possible redemption is excluded from earnings per share, as the redemption value approximates fair value. The following table presents a reconciliation of the numerator and denominator used to compute basic and diluted net (loss) income per share for each ordinary share class. ​ ​ For the Three Months Ended September 30, ​ ​ For the Nine Months Ended September 30, ​ ​ 2023 ​ ​ 2022 ​ ​ 2023 ​ ​ 2022 ​ ​ Class A ​ ​ Class B ​ ​ Class A ​ ​ Class B ​ ​ Class A ​ ​ Class B ​ ​ Class A ​ ​ Class B Basic and diluted net (loss) income per common share: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Numerator: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allocation of net (loss) income ​ ​ $(101,278) ​ ​ $ (1,645,286) ​ ​ $ 949,460 ​ ​ $ 237,365 ​ ​ $(1,450,300) ​ ​ $ (6,325,489) ​ $10,917,529 ​ ​ $ 2,729,382 Denominator: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Basic and diluted weighted average common shares outstanding ​ ​ 743,298 ​ ​ 12,075,000 ​ ​ 48,300,000 ​ ​ 12,075,000 ​ ​ 2,768,541 ​ ​ 12,075,000 ​ ​ 48,300,000 ​ ​ 12,075,000 Basic and diluted net (loss) income per common share ​ ​ $ (0.14) ​ ​ $ (0.14) ​ ​ $ 0.02 ​ ​ $ 0.02 ​ ​ $ (0.52) ​ ​ $ (0.52) ​ ​ $ 0.23 ​ ​ $ 0.23 Recent Accounting Pronouncements The Company’s management does not believe there are any recently issued, but not yet effective, accounting pronouncements if currently adopted would have a material effect on the Company’s unaudited condensed financial statements.	Note 2-Summary of Significant Accounting Policies Basis of Presentation The accompanying financial statements are presented in U.S. dollars in conformity with accounting principles generally accepted in the United States of America (“ GAAP Emerging Growth Company The Company is an “emerging growth company,” as defined in Section 2(a) of the Securities Act, as modified by the Jumpstart Our Business Startups Act of 2012 (the “ JOBS Act Further, Section 102(b)(1) of the JOBS Act exempts emerging growth companies from being required to comply with new or revised financial accounting standards until private companies (that is, those that have not had a Securities Act registration statement declared effective or do not have a class of securities registered under the Exchange Act) are required to comply with the new or revised financial accounting standards. The JOBS Act provides that an emerging growth company can elect to opt out of the extended transition period and comply with the requirements that apply to non-emerging growth companies but any such an election to opt out is irrevocable. The Company has elected not to opt out of such extended transition period, which means that when a standard is issued or revised and it has different application dates for public or private companies, the Company, as an emerging growth company, can adopt the new or revised standard at the time private companies adopt the new or revised standard. This may make comparison of the Company’s financial statement with another public company that is neither an emerging growth company nor an emerging growth company that has opted out of using the extended transition period difficult or impossible because of the potential differences in accounting standards used. Concentration of Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist of cash accounts in a financial institution, which, at times, may exceed the Federal Depository Insurance Coverage limit of $250,000. As of December 31, 2022 and 2021, the Company has not experienced losses on these accounts and management believes the Company is not exposed to significant risks on such accounts. Cash and Cash Equivalents The Company considers all short-term investments with an original maturity of three months or less when purchased to be cash equivalents. The Company had no cash equivalents as of December 31, 2022 and 2021. Investments Held in Trust Account The Company’s portfolio of investments is comprised of U.S. government securities, within the meaning set forth in Section 2(a)(16) of the Investment Company Act, with a maturity of 185 days or less, or investments in money market funds that invest in U.S. government securities and generally have a readily determinable fair value, or a combination thereof. When the Company’s investments held in the Trust Account are comprised of U.S. government securities, the investments are classified as trading securities. When the Company’s investments held in the Trust Account are comprised of money market funds, the investments are recognized at fair value. Trading securities and investments in money market funds are presented on the balance sheets at fair value at the end of each reporting period. Gains and losses resulting from the change in fair value of these securities is included in unrealized gain on investments held in Trust Account in the accompanying statements of operations. The estimated fair values of investments held in the Trust Account are determined using available market information, other than for investments in open-ended money market funds with published daily net asset values (“ NAV Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires the Company’s management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statement. Making estimates requires management to exercise significant judgment. It is at least reasonably possible that the estimate of the effect of a condition, situation or set of circumstances that existed at the date of the financial statement, which management considered in formulating its estimate, could change in the near term due to one or more future confirming events. Accordingly, the actual results could differ significantly from those estimates. Fair Value of Financial Instruments The fair value of the Company’s assets and liabilities, which qualify as financial instruments under the FASB ASC Topic 820, “Fair Value Measurements,” approximates the carrying amounts represented in the balance sheet. Fair Value Measurements Fair value is defined as the price that would be received for sale of an asset or paid for transfer of a liability, in an orderly transaction between market participants at the measurement date. GAAP establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). These tiers include: • Level 1, defined as observable inputs such as quoted prices for identical instruments in active markets; • Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable such as quoted prices for similar instruments in active markets or quoted prices for identical or similar instruments in markets that are not active; and • Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions, such as valuations derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable. In some circumstances, the inputs used to measure fair value might be categorized within different levels of the fair value hierarchy. In those instances, the fair value measurement is categorized in its entirety in the fair value hierarchy based on the lowest level input that is significant to the fair value measurement. Working Capital Loan Option On January 19, 2022, the Sponsor agreed to loan the Company up to $500,000 to be used for a portion of the expenses of the Company. The note is due upon consummation of our Business Combination, without interest. At the option of the Sponsor, the outstanding principle of $500,000 may be converted into that number of warrants (“ Conversion Warrants Working Capital Loan Option under ASC 815 and is required to be recognized at fair value with subsequent changes in fair value recognized in Company’s statements of operations each reporting period until the loan is repaid or converted. As of December 31, 2022, the fair value of the Working Capital Loan Option was $500,000, see Note 9. Derivative Warrant Liabilities The Company does not use derivative instruments to hedge exposures to cash flow, market, or foreign currency risks. The Company evaluates all of its financial instruments, including issued share purchase warrants, to determine if such instruments are derivatives or contain features that qualify as embedded derivatives, pursuant to FASB ASC Topic 480 and ASC Topic 815, “Derivatives and Hedging” (“ ASC 815 The warrants issued in the Initial Public Offering (the “ Public Warrants Offering Costs Associated with the Initial Public Offering Offering costs consisted of legal, accounting, underwriting and other costs incurred in connection with the Initial Public Offering that were directly related to the Initial Public Offering. Offering costs were allocated to the separable financial instruments issued in the Initial Public Offering based on a relative fair value basis, compared to total proceeds received. Offering costs associated with derivative warrant liabilities were expensed as incurred and presented as non-operating expenses in the statements of operations. Offering costs associated with the issuance of the Class A ordinary shares were charged against the carrying value of the Class A ordinary shares subject to possible redemption upon the completion of the Initial Public Offering. The Company classifies deferred underwriting commissions as non-current liabilities as their liquidation is not reasonably expected to require the use of current assets or require the creation of current liabilities. Class A Ordinary Shares Subject to Possible Redemption The Company accounts for its Class A ordinary shares subject to possible redemption in accordance with ASC 480. Class A ordinary shares subject to mandatory redemption (if any) are classified as liability instruments and are measured at fair value. Conditionally redeemable Class A ordinary shares (including Class A ordinary shares that feature redemption rights that are either within the control of the holder or subject to redemption upon the occurrence of uncertain events not solely within the Company’s control) are classified as temporary equity. At all other times, Class A ordinary shares are classified as shareholders’ equity. The Company’s Class A ordinary shares feature certain redemption rights that are considered to be outside of the Company’s control and subject to the occurrence of uncertain future events. Accordingly, as of December 31, 2022 and 2021, 48,300,000 Class A ordinary shares subject to possible redemption are presented at redemption value as temporary equity, outside of the shareholders’ equity section of the Company’s balance sheet. Effective with the closing of the Initial Public Offering, the Company recognized the accretion from initial book value to redemption amount, which resulted in charges against additional paid-in capital (to the extent available) and accumulated deficit. Income Taxes The Company complies with the accounting and reporting requirements of ASC Topic 740, “Income Taxes” (“ ASC 740 tax bases of assets and liabilities that will result in future taxable or deductible amounts, based on enacted tax laws and rates applicable to the periods in which the differences are expected to affect taxable income. Valuation allowances are established, when necessary, to reduce deferred tax assets to the amount expected to be realized. ASC 740 prescribes a recognition threshold and a measurement attribute for the financial statement recognition and measurement of tax positions taken or expected to be taken in a tax return. For those benefits to be recognized, a tax position must be more-likely-than-not to be sustained upon examination by taxing authorities. The Company’s management determined that the Cayman Islands is the Company’s only major tax jurisdiction. The Company recognizes accrued interest and penalties related to unrecognized tax benefits as income tax expense. There were no unrecognized tax benefits and no amounts accrued for interest and penalties as of December 31, 2022 and 2021. The Company is currently not aware of any issues under review that could result in significant payments, accruals or material deviation from its position. There is currently no taxation imposed on income by the Government of the Cayman Islands. In accordance with Cayman federal income tax regulations, income taxes are not levied on the Company. Consequently, income taxes are not reflected in the Company’s financial statement. The Company’s management does not expect that the total amount of unrecognized tax benefits will materially change over the next twelve months. Net Income per Ordinary Share The Company has two classes of shares issued and outstanding: Class A ordinary shares and Class B ordinary shares. Income and losses are shared pro rata between the two classes of shares. Net income per ordinary share is computed by dividing net income by the weighted-average number of ordinary shares outstanding during the periods. The Company has not considered the effect of the warrants sold in the Initial Public Offering and the Private Placement to purchase an aggregate of 17,876,330, of the Company’s Class A ordinary shares in the calculation of diluted net income per share, because their exercise is contingent upon future events and their exercise is contingent upon future events. As a result, diluted net income per share is the same as basic net income per share for the years ended December 31, 2022 and 2021. Accretion associated with the Class A ordinary shares subject to possible redemption is excluded from earnings per share, as the redemption value approximates fair value. The following table presents a reconciliation of the numerator and denominator used to compute basic and diluted net income per share for each ordinary share class: ​ ​ For the Year Ended December 31, 2022 ​ ​ For the Year Ended December 31, 2021 ​ ​ Class A ​ ​ Class B ​ ​ Class A ​ ​ Class B Basic and diluted net income per common share: ​ ​ ​ ​ ​ ​ ​ ​ Numerator: ​ ​ ​ ​ ​ ​ ​ ​ Allocation of net income (loss) ​ ​ $12,700,862 ​ ​ $ 3,175,215 ​ ​ $ 5,468,324 ​ ​ $ 1,509,295 Denominator: ​ ​ ​ ​ ​ ​ ​ ​ Basic and diluted weighted average common shares outstanding ​ ​ 48,300,000 ​ ​ 12,075,000 ​ ​ 43,139,178 ​ ​ 11,906,712 Basic and diluted net income per common share ​ ​ $ 0.26 ​ ​ $ 0.26 ​ ​ $ 0.13 ​ ​ $ 0.13 Recent Accounting Pronouncements The Company’s management does not believe there are any recently issued, but not yet effective, accounting pronouncements if currently adopted would have a material effect on the Company’s financial statements.

Initial Public Offering (Q3)

Initial Public Offering (Q3)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Initial Public Offering
Initial Public Offering	Note 3-Initial Public Offering On February 9, 2021, the Company consummated its Initial Public Offering of 48,300,000 Units, including 6,300,000 Over-Allotment Units, at $10.00 per Unit, generating gross proceeds of $483.0 million, and incurring offering costs of approximately $27.1 million, of which approximately $16.9 million was for deferred underwriting commissions and $250,000 was for deferred legal fees. Each Unit consists of one Class A ordinary share and one-fifth	Note 3-Initial Public Offering On February 9, 2021, the Company consummated its Initial Public Offering of 48,300,000 Units, including 6,300,000 Over-Allotment Units, at $10.00 per Unit, generating gross proceeds of $483.0 million, and incurring offering costs of approximately $27.1 million, of which approximately $16.9 million was for deferred underwriting commissions and $250,000 was for deferred legal fees. Each Unit consists of one Class A ordinary share and one-fifth Public Warrant

Related Party Transactions (Q3)

Related Party Transactions (Q3)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Related Party Transactions [Abstract]
Related Party Transactions	Note 4-Related Party Transactions Founder Shares In December 2020, the Sponsor paid an aggregate of $25,000 to cover certain expenses on behalf of the Company in exchange for issuance of 10,062,500 ordinary shares (the “Founder Shares”). On January 30, 2021, the Company effectuated a 5-for-6 The Initial Shareholders agreed not to transfer, assign or sell any of their Founder Shares until the earlier to occur of (1) one year after the completion of the initial Business Combination; and (2) subsequent to the initial Business Combination (x) if the last reported sale price of Class A ordinary shares equals or exceeds $12.00 per share (as adjusted for share sub-divisions, share dividends, rights issuances, consolidations, reorganizations, recapitalizations and the like) for any 20 trading days within any 30-trading day period commencing at least 150 days after the initial Business Combination or (y) the date on which the Company completes a liquidation, merger, amalgamation, share exchange, reorganization or other similar transaction that results in all of the Public Shareholders having the right to exchange their ordinary shares for cash, securities or other property. Private Placement Warrants Simultaneously with the closing of the Initial Public Offering, the Company consummated the Private Placement of 8,216,330 Private Placement Warrants at a price of $1.50 per Private Placement Warrant to the Sponsor, generating proceeds of approximately $12.3 million. Each whole Private Placement Warrant is exercisable for one whole share of Class A ordinary shares at a price of $11.50 per share. A portion of the proceeds from the sale of the Private Placement Warrants to the Sponsor was added to the proceeds from the Initial Public Offering held in the Trust Account. If the Company does not complete a Business Combination within the Combination Period, the Private Placement Warrants will expire worthless. The Private Placement Warrants will be non-redeemable for cash and exercisable on a cashless basis so long as they are held by the Sponsor or its permitted transferees. The Sponsor and the Company’s officers and directors agreed, subject to limited exceptions, not to transfer, assign or sell any of their Private Placement Warrants until 30 days after the completion of the initial Business Combination. Related Party Loans In order to finance transaction costs in connection with a Business Combination, the Sponsor, members of the Company’s founding team or any of their affiliates may, but are not obligated to, loan the Company funds as may be required (“ Working Capital Loans On December 30, 2020, the Sponsor agreed to loan the Company up to $300,000 to be used for the payment of costs related to the Initial Public Offering pursuant to a promissory note (the “ Note On January 19, 2022, the Sponsor agreed to loan the Company up to $500,000 to be used for a portion of the expenses of the Company (the “ January 2022 Note On July 27, 2022, the Sponsor agreed to loan the Company up to $475,000 pursuant to an unsecured, non-interest bearing promissory note (the “ July 2022 Note As of September 30, 2023 and December 31, 2022, the Company had $850,000 and $500,000, respectively, in total borrowings outstanding under the Working Capital Loans. As of September 30, 2023 and December 31, 2022, the carrying value and the principal value of the loan Administrative Services Agreement Commencing on the effective date of the Registration Statement, the Company agreed to pay an affiliate of the Sponsor a total of $20,000 per month for office space, administrative and support services (including salaries). Upon the Company’s liquidation, the Company will cease paying these monthly fees. Upon completion of the initial Business Combination, the Company will pay to such affiliate an amount equal to $20,000 multiplied by the number of whole months that have elapsed between the date of the completion of the initial Business Combination and the closing of the Initial Public Offering. The Company incurred $60,000 and $180,000 in expenses The Sponsor, officers and directors, or any of their respective affiliates, will be reimbursed for any out-of-pocket expenses incurred in connection with activities on the Company’s behalf such as identifying potential target businesses and performing due diligence on suitable business combinations. The audit committee will review on a quarterly basis all payments that were made by us to the Sponsor, directors, officers or the Company’s or any of their respective affiliates.	Note 4-Related Party Transactions Founder Shares In December 2020, the Sponsor paid an aggregate of $25,000 to cover certain expenses on behalf of the Company in exchange for issuance of 10,062,500 ordinary shares (the “ Founder Shares 5-for-6 The Initial Shareholders agreed not to transfer, assign or sell any of their Founder Shares until the earlier to occur of (1) one year after the completion of the initial Business Combination; and (2) subsequent to the initial Business Combination (x) if the last reported sale price of Class A ordinary shares equals or exceeds $12.00 per share (as adjusted for share sub-divisions, share dividends, rights issuances, consolidations, reorganizations, recapitalizations and the like) for any 20 trading days within any 30-trading day period commencing at least 150 days after the initial Business Combination or (y) the date on which the Company completes a liquidation, merger, amalgamation, share exchange, reorganization or other similar transaction that results in all of the Public Shareholders having the right to exchange their ordinary shares for cash, securities or other property. Private Placement Warrants Simultaneously with the closing of the Initial Public Offering, the Company consummated the Private Placement of 8,216,330 Private Placement Warrants at a price of $1.50 per Private Placement Warrant to the Sponsor, generating proceeds of approximately $12.3 million. Each whole Private Placement Warrant is exercisable for one whole share of Class A ordinary shares at a price of $11.50 per share. A portion of the proceeds from the sale of the Private Placement Warrants to the Sponsor was added to the proceeds from the Initial Public Offering held in the Trust Account. If the Company does not complete a Business Combination within the Combination Period, the Private Placement Warrants will expire worthless. The Private Placement Warrants will be non-redeemable for cash and exercisable on a cashless basis so long as they are held by the Sponsor or its permitted transferees. The Sponsor and the Company’s officers and directors agreed, subject to limited exceptions, not to transfer, assign or sell any of their Private Placement Warrants until 30 days after the completion of the initial Business Combination. Related Party Loans In order to finance transaction costs in connection with a Business Combination, the Sponsor, members of the Company’s founding team or any of their affiliates may, but are not obligated to, loan the Company funds as may be required (“ Working Capital Loans event that a Business Combination does not close, the Company may use a portion of proceeds held outside the Trust Account to repay the Working Capital Loans but no proceeds held in the Trust Account would be used to repay the Working Capital Loans. The Working Capital Loans would either be repaid upon consummation of a Business Combination, without interest, or, at the lenders’ discretion, up to $1,500,000 of such Working Capital Loans may be convertible into warrants of the post-Business Combination entity at a price of $1.50 per warrant. The warrants would be identical to the Private Placement Warrants. On December 30, 2020, the Sponsor agreed to loan the Company up to $300,000 to be used for the payment of costs related to the Initial Public Offering pursuant to a promissory note (the “ Note On January 19, 2022, the Sponsor agreed to loan the Company up to $500,000 to be used for a portion of the expenses of the Company. As of December 31, 2022, an aggregate of $500,000 had been funded under the loan agreement. At the option of the Sponsor, the outstanding principle of $500,000 may be converted into Conversion Warrants equal to the outstanding principle of the note divided by $1.50. Upon funding of the loan, the Company recognized the initial fair value of the Working Capital Loan Option of approximately $7,900 as a debt discount, which is classified as a component of the working capital loan and amortized to interest expense over the expected term of the loan. For the year ended December 31, 2022, the Company amortized approximately $8,000, of the debt discount, classified as interest expense in the accompanying statements of operations. On July 27, 2022, the Sponsor agreed to loan the Company up to $475,000 pursuant to an unsecured, non-interest bearing promissory note (the “ July 2022 Note As of December 31, 2022, the Company had $500,000 in borrowings outstanding under the Working Capital Loans. As of December 31, 2022, the carrying value and the principal value of the loan Administrative Services Agreement Commencing on the effective date of the Registration Statement, the Company agreed to pay an affiliate of the Sponsor a total of $20,000 per month for office space, administrative and support services (including salaries). Upon the Company’s liquidation, the Company will cease paying these monthly fees. Upon completion of the Initial Business Combination, the Company will pay to such affiliate an amount equal to $20,000 multiplied by the number of whole months that have elapsed between the date of the completion of the Initial Business Combination and the closing of the Initial Public Offering. The Company incurred approximately $240,000 and $220,000 in expenses The Sponsor, officers and directors, or any of their respective affiliates, will be reimbursed for any out-of-pocket expenses incurred in connection with activities on the Company’s behalf such as identifying potential target businesses and performing due diligence on suitable business combinations. The audit committee will review on a quarterly basis all payments that were made by us to the Sponsor, directors, officers or the Company’s or any of their respective affiliates. In December 2022, the Company engaged a capital market advisor to assist with the completion of the business combination. The Company agreed to pay the advisor $500,000 in cash and $250,000 paid in equivalent dollar amount in common stock, solely in the event that the Company completes its Business Combination. As of December 31, 2022, the Company determined that a Business Combination is not considered probable. If the fee is determined to be a transaction cost for the Business Combination then the amount payable to the advisor may be accounted for as an expense in the period the liability is recorded.

Commitments & Contingencies (Q3

Commitments & Contingencies (Q3)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Commitments & Contingencies [Abstract]
Commitments & Contingencies	Note 5-Commitments &Contingencies Registration and Shareholder Rights Agreement The holders of the Founder Shares, Private Placement Warrants and any warrants that may be issued upon conversion of Working Capital Loans (and any Class A ordinary shares issuable upon the exercise of the Private Placement Warrants or warrants issued upon conversion of the Working Capital Loans and upon conversion of the Founder Shares) were entitled to registration rights pursuant to a registration and shareholder rights agreement signed upon the effective date of the Initial Public Offering. The holders of these securities were entitled to make up to three demands, excluding short form demands, that the Company registers such securities. In addition, the holders have certain “piggy-back” registration rights with respect to registration statements filed subsequent to the completion of the initial Business Combination. The Company will bear the expenses incurred in connection with the filing of any such registration statements. Underwriting Agreement The Company granted the underwriters a 45-day option from the date of this prospectus to purchase up to 6,300,000 additional Units at the Initial Public Offering price less the underwriting discounts and commissions. The underwriter exercised its over-allotment option in full on February 9, 2021. The underwriters were entitled to an underwriting discount of $0.20 per unit, or approximately $9.7 million in the aggregate, paid upon the closing of the Initial Public Offering. In addition, $0.35 per unit, or approximately $16.9 million in the aggregate will be payable to the underwriters for deferred underwriting commissions. On April 16, 2023, one of the underwriters waived its entitlement to the payment of any deferred fee, of approximately $10,143,000, to be paid under the terms of the underwriting agreement and is no longer serving in any advisor capacity. As a result, the Company recognized $440,592 of income and $9,702,408 was recorded to additional paid-in capital in relation to the reduction of the deferred underwriter fee. As of September 30, 2023 and December 31, 2022, the deferred underwriting fee payable is $6,762,000 and $16,905,000, respectively. The deferred fee will become payable to the underwriters from the amounts held in the Trust Account solely in the event that the Company completes a Business Combination, subject to the terms of the underwriting agreement. On April 17, 2023, one of the underwriters waived its entitlement to the payment of any deferred fee, of approximately $6,762,000, to be paid under the terms of the underwriting agreement specifically to closing of the Merger Agreement (as defined below) with H2B2 Electrolysis Technologies (“H2B2”). Due to the waiver of the deferred fees being contingent upon the closing of a business combination with H2B2, the deferred underwriting fee remains payable on the unaudited condensed balance sheets until the closing of the business combination with H2B2. Contingent Fee Agreements In December 2022, the Company engaged a capital market advisor to assist with the completion of the Business Combination. The Company agreed to pay the advisor $500,000 in cash and $250,000 paid in equivalent dollar amount in common stock, solely in the event that the Company completes its Business Combination. As of September 30, 2023, the Company determined that a Business Combination is not considered probable. If the fee is determined to be a transaction cost for the Business Combination then the amount payable to the advisor may be accounted for as an expense in the period the liability is recorded. Risks and Uncertainties Management continues to evaluate the impact of the COVID-19 pandemic and has concluded that while it is reasonably possible that the virus could have a negative effect on the Company’s financial position, results of its operations, and/or search for a target company, the specific impact is not readily determinable as of the date of these unaudited condensed financial statements. These unaudited condensed financial statements do not include any adjustments that might result from the outcome of this uncertainty. In February 2022, the Russian Federation and Belarus commenced a military action with the country of Ukraine. As a result of this action, various nations, including the United States, have instituted economic sanctions against the Russian Federation and Belarus. Further, the impact of this action and related sanctions on the world economy are not determinable as of the date of these unaudited condensed financial statements and the specific impact on the Company’s financial condition, results of operations, and cash flows is also not determinable as of the date of these unaudited condensed financial statements. Proposed Business Combination On May 9, 2023, the Company entered into an Agreement and Plan of Merger (the “Merger Agreement”), by and between the Company and H2B2, which provides for, among other things, the deregistration of the Company under the Companies Act (as revised) of the Cayman Islands and the domestication of the Company as a Delaware corporation (the “Domestication”) and, following the Domestication, the merger of H2B2 with and into the Company, with the Company continuing as the surviving corporation (the “Merger” and, together with the Domestication and the other transactions contemplated by the Merger Agreement, the “Transactions”). As a result of the Transactions, H2B2 will cease to exist and the stockholders of H2B2 will become stockholders of the Company. The transactions set forth in the Merger Agreement, including the Domestication and the Merger, will constitute a “Business Combination” as contemplated by the Company’s Amended and Restated Memorandum and Articles of Association. Under the Merger Agreement, the stockholders of H2B2 will receive a number of shares of the domesticated Company’s common stock based on an exchange ratio (the “Exchange Ratio”), the numerator of which is equal to $750 million (which amount will be subject to adjustment in the event that H2B2 issues debt or equity prior to the closing of the Transactions) divided by $10.00, and the denominator of which is equal to the number of outstanding shares of H2B2, including shares that would be issuable upon the exercise in full of all H2B2 options. The holders of H2B2 options will receive the Company’s options equal to the number of shares of H2B2 common stock subject to the H2B2 options multiplied by the Exchange Ratio at an exercise price per share divided by the Exchange Ratio. In connection with the Transactions, the Company, Sponsor, certain of H2B2’s directors and officers and certain former stockholders of H2B2 agreed to enter into lock-up agreements at the closing of the Merger, which will restrict the transfer of (i) a number of shares of the surviving corporation common stock held by such securityholder, as set forth in the lock-up agreement, (ii) any shares of the surviving corporation common stock held issuable upon the exercise or settlement, as applicable, of surviving corporation options held by a securityholder, or (iii) any other securities convertible into or exercisable or exchangeable for surviving corporation common stock held by a securityholder. The lock-up agreements will restrict the transfer until 180 days after the closing of the Merger, subject to limited exceptions and early release provisions set forth under the lock-up agreements. The Merger Agreement contains certain representations and warranties of the parties to the Merger Agreement and consummation of the Transactions is conditioned on approval thereof by the Company’s shareholders and is further conditioned upon, representations and warranties of the parties and other closing conditions. The Merger Agreement may be terminated at any time, but not later than the closing of the Merger, as follows: • by written consent of H2B2 and the Company; • by H2B2 or the Company if any governmental authority has enacted, issued, promulgated, enforced or entered any law or governmental order which has become final and non-appealable and has the effect of making consummation of the transactions contemplated by the Merger Agreement and the Ancillary Agreements (as defined in the Merger Agreement) illegal or otherwise enjoining, preventing or prohibiting the consummation of the transactions contemplated by the Merger Agreement and the Ancillary Agreements (provided that such party did not cause such enactment); • by H2B2 or the Company if the consummation of the Transactions has not occurred on or prior to June 30, 2024, subject to certain automatic extensions, for reasons not primarily due to the terminating party’s breach or violation of the terms of the Merger Agreement; • by H2B2 or the Company if such party disagrees with the final determination of the Closing Date Purchase Price (as defined in the Merger Agreement) by the valuation firm as further described in the Merger Agreement; • by H2B2 if there has been a modification in recommendation of the Company’s board of directors with respect to any of the Proposals (as defined in the Merger Agreement); • by H2B2 if the Company has not obtained shareholder approval for the Transactions by reason of the failure to obtain the required vote at a meeting of the Company’s shareholders; • by H2B2 if (i) prior to completion of a Capital Raise Transaction (as defined in the Merger Agreement), a Capital Raise Investor (as defined in the Merger Agreement) or group of Capital Raise Investors, with legal, valid and binding commitments to fund in such Capital Raise Transaction represent in the aggregate at least the Minimum Investment Amount (as defined in the Merger Agreement) object to the Merger and the other transactions contemplated by the Merger Agreement by delivering a written notice to the board of directors of H2B2 by no later than fifteen days following execution of definitive agreements relating to the Capital Raise Transaction after which time no Capital Raise Investor will be entitled to object to the Merger and the other transactions contemplated by the Merger Agreement; provided that, upon receipt of the written notice described above, H2B2 will be required to terminate the Merger Agreement on the tenth • by H2B2 in the event of an uncured breach of any representation, warranty, covenant or agreement on the part of the Company, except if the breach is curable by the Company through the exercise of its reasonable best efforts, then, for a period of up to thirty • by the Company in the event of an uncured breach of any representation, warranty, covenant or agreement on the part of H2B2, except if the breach is curable by H2B2 through the exercise of its reasonable best efforts, then, for a period of up to thirty • by the Company if the H2B2 stockholder approval has not been obtained; and • by the Company if an H2B2 stockholder exercises any right or takes any action or fails to take any action required to satisfy the conditions or any closing deliverables required to be delivered under the Merger Agreement that prevents consummation of the Merger and the other transactions contemplated by the Merger Agreement and the Ancillary Agreements. At the closing of the Merger, the Company, the Sponsor and certain of H2B2’s stockholders will enter into an Amended and Restated Registration Rights Agreement (the “Registration Rights Agreement”) pursuant to which the Company agreed to file a shelf registration statement with respect to the registrable securities under the Registration Rights Agreement. The Company also agreed to provide customary “piggyback” registration rights. The Registration Rights Agreement also provides that the Company will pay certain expenses relating to such registrations and indemnify the stockholders against certain liabilities. In connection with the execution of the Merger Agreement, the Sponsor and certain other persons have entered into a Support Agreement (the “Sponsor Support Agreement”) with the Company, pursuant to holders of the Company’s Class B ordinary shares have agreed to, among other things, (i) vote at any meeting or pursuant to any action of written resolution of our shareholders all of their Class B ordinary shares held of record or thereafter acquired in favor of the Transactions and (ii) be bound by certain other covenants and agreements related to the Transactions, in each case, on the terms and subject to the conditions set forth in the Sponsor Support Agreement. In connection with the execution of the Merger Agreement, certain stockholders of H2B2 who hold a majority of the outstanding stock of H2B2 have entered into support agreements pursuant to which they will agree to vote in favor of the Transactions at a meeting called to approve the Transactions by H2B2 stockholders (or to act by written consent approving the Transactions). The summaries of the Merger Agreement and the other agreements to be entered into by the parties are qualified in their entirety by reference to the text of the Merger Agreement and agreements entered into in connection therewith. Reimbursable Costs As a condition of the Merger Agreement, H2B2 agreed to reimburse the Company for 50% of the costs incurred as a result of the need to extend the life of the Company to complete a Business Combination if the extension is required for reasons that are not predominantly attributable to the Company or H2B2, up to a maximum of $250,000. The Company determined the reimbursable costs totaled $238,917 as of September 30, 2023. As of September 30, 2023, H2B2 reimbursed the Company in full for a total of $119,458, which is recorded as a reduction in related expenses included in general and administrative expenses on the unaudited condensed statement of operations.	Note 5-Commitments & Contingencies Registration and Shareholder Rights Agreement The holders of the Founder Shares, Private Placement Warrants and any warrants that may be issued upon conversion of Working Capital Loans (and any Class A ordinary shares issuable upon the exercise of the Private Placement Warrants or warrants issued upon conversion of the Working Capital Loans and upon conversion of the Founder Shares) were entitled to registration rights pursuant to a registration and shareholder rights agreement signed upon the effective date of the Initial Public Offering. The holders of these securities were entitled to make up to three demands, excluding short form demands, that the Company registers such securities. In addition, the holders have certain “piggy-back” registration rights with respect to registration statements filed subsequent to the completion of the initial Business Combination. The Company will bear the expenses incurred in connection with the filing of any such registration statements. Underwriting Agreement The Company granted the underwriters a 45-day option from the date of this prospectus to purchase up to 6,300,000 additional Units at the Initial Public Offering price less the underwriting discounts and commissions. The underwriter exercised its over-allotment option in full on February 9, 2021. The underwriters were entitled to an underwriting discount of $0.20 per unit, or approximately $9.7 million in the aggregate, paid upon the closing of the Initial Public Offering. In addition, $0.35 per unit, or approximately $16.9 million in the aggregate will be payable to the underwriters for deferred underwriting commissions. The deferred fee will become payable to the underwriters from the amounts held in the Trust Account solely in the event that the Company completes a Business Combination, subject to the terms of the underwriting agreement. Risks and Uncertainties Management continues to evaluate the impact of COVID-19 and has concluded that while it is reasonably possible that the virus could have a negative effect on the Company’s financial position, results of its operations, and/or search for a target company, the specific impact is not readily determinable as of the date of these financial statements. These financial statements do not include any adjustments that might result from the outcome of this uncertainty. In February 2022, the Russian Federation and Belarus commenced a military action with the country of Ukraine. As a result of this action, various nations, including the United States, have instituted economic sanctions against the Russian Federation and Belarus. Further, the impact of this action and related sanctions on the world economy are not determinable as of the date of these financial statements and the specific impact on the Company’s financial condition, results of operations, and cash flows is also not determinable as of the date of these financial statements.

Class A Ordinary Shares Subject

Class A Ordinary Shares Subject to Possible Redemption (Q3)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Temporary Equity Disclosure [Abstract]
Class A Ordinary Shares Subject to Possible Redemption	Note 6-Class A Ordinary Shares Subject to Possible Redemption The Company’s Class A ordinary shares feature certain redemption rights that are considered to be outside of the Company’s control and subject to the occurrence of future events. The Company is authorized to issue 500,000,000 Class A ordinary shares with a par value of $0.0001 per share. As of September 30, 2023 and December 31, 2022, there were 635,778 and 48,300,000 Class A ordinary shares issued and outstanding, respectively, which were all subject to possible redemption and are classified outside of permanent equity in the balance sheets. In connection with the extraordinary general meeting held on January 11, 2023, holders of 47,381,598 shares of the Company’s Class A ordinary shares exercised their right to redeem for a redemption value totaling $478,003,632. In connection with the extraordinary general meeting held on August 4, 2023, holders of 282,624 shares of the Company’s Class A ordinary shares exercised their right to redeem for a redemption value totaling $2,942,664. During the nine months ended September 30, 2023, the Company had withdrawn $1,230,308 for working capital purposes. During the year ended December 31, 2022, the Company had withdrawn from the Trust Account $43,317 for working capital purposes. The Class A ordinary shares issued in the Initial Public Offering were recognized in Class A ordinary shares subject to possible redemption as follows: Class A ordinary shares subject to possible redemption at December 31, 2021 ​ ​ $ 483,000,000 Increase in redemption value of Class A ordinary shares subject to possible redeem ​ ​ 4,168,822 Class A ordinary shares subject to possible redemption at December 31, 2022 ​ ​ 487,168,822 Redemptions of Class A ordinary shares ​ ​ (480,946,296) Increase in redemption value of Class A ordinary shares subject to possible redeem ​ ​ 135,254 Class A ordinary shares subject to possible redemption at September 30, 2023 ​ ​ $ 6,357,780	Note 6-Class A Ordinary Shares Subject to Possible Redemption The Company’s Class A ordinary shares feature certain redemption rights that are considered to be outside of the Company’s control and subject to the occurrence of future events. The Company is authorized to issue 500,000,000 Class A ordinary shares with a par value of $0.0001 per share. As of December 31, 2022 and 2021, there were 48,300,000 Class A ordinary shares issued and outstanding, which were all subject to possible redemption and are classified outside of permanent equity in the balance sheets. The Class A ordinary shares issued in the Initial Public Offering were recognized in Class A ordinary shares subject to possible redemption as follows: Gross Proceeds ​ ​ $483,000,000 Less: ​ ​ Offering costs allocated to Class A shares subject to possible redemption ​ ​ (26,406,165) Proceeds allocated to Public Warrants at issuance ​ ​ (12,863,680) Plus: ​ ​ Accrection on Class A ordinary shares subject to possible redemption amount ​ ​ 39,269,845 Class A ordinary shares subject to possible redemption at December 31, 2021 ​ ​ 483,000,000 Increase in redemption value of Class A ordinary shares subject to possible redeem ​ ​ 4,168,822 Class A ordinary shares subject to possible redemption at December 31, 2022 ​ ​ $487,168,822

Shareholders' Deficit (Q3)

Shareholders' Deficit (Q3)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Shareholders' (Deficit) Equity [Abstract]
Shareholders' Deficit	Note 7-Shareholders’ Deficit Preference Shares - The Company is authorized to issue 5,000,000 preference shares with a par value of $0.0001 per share. At September 30, 2023 and December 31, 2022, there were no preference shares issued or outstanding. Class A Ordinary Shares - The Company is authorized to issue 500,000,000 Class A ordinary shares with a par value of $0.0001 per share. Holders of the Company’s Class A ordinary shares are entitled to one vote for each share. At September 30, 2023 and December 31, 2022, there were 635,778 and 48,300,000 shares issued and outstanding, all of which are subject to possible redemption and have been classified as temporary equity (see Note 7). Class B Ordinary Shares - The Company is authorized to issue 50,000,000 Class B ordinary shares with a par value of $0.0001 per share. On February 9, 2021, 10,062,500 Class B ordinary shares were issued and outstanding. On January 30, 2021, the Company effectuated a 5-for-6 Only holders of Class B ordinary shares will have the right to vote on the election of directors prior to the initial Business Combination. Holders of the Class A ordinary shares and holders of the Class B ordinary shares will vote together as a single class on all other matters submitted to a vote of the shareholders, except as required by law. Each ordinary share will have one vote on all such matters. The Class B ordinary shares will automatically convert into Class A ordinary shares at the time of the initial Business Combination, or earlier at the option of the holder, on a one-for-one basis, subject to adjustment for share sub-divisions, share dividends, rights issuances, consolidations, reorganizations, recapitalizations and the like, and subject to further adjustment as provided herein. In the case that additional Class A ordinary shares, or equity-linked securities, are issued or deemed issued in excess of the amounts issued in the Initial Public Offering and related to the closing of the initial Business Combination, the ratio at which the Class B ordinary shares will convert into Class A ordinary shares will be adjusted (unless the holders of a majority of the issued and outstanding Class B ordinary shares agree to waive such anti-dilution adjustment with respect to any such issuance or deemed issuance) so that the number of Class A ordinary shares issuable upon conversion of all Class B ordinary shares will equal, in the aggregate, on an as-converted basis, 20% of the sum of all ordinary shares issued and outstanding upon the completion of the Initial Public Offering plus all Class A ordinary shares and equity-linked securities issued or deemed issued in connection with the initial Business Combination, excluding any shares or equity-linked securities issued, or to be issued, to any seller in the initial Business Combination. In no event will the Class B ordinary shares convert into Class A ordinary shares at a rate of less than one to one.	Note 7-Shareholders’ Equity Preference Shares - The Company is authorized to issue 5,000,000 preference shares with a par value of $0.0001 per share. At December 31, 2022 and 2021, there were no preference shares issued or outstanding. Class A Ordinary Shares - The Company is authorized to issue 500,000,000 Class A ordinary shares with a par value of $0.0001 per share. Holders of the Company’s Class A ordinary shares are entitled to one vote for each share. At December 31, 2022 and 2021, there were 48,300,000 shares issued and outstanding, all of which are subject to possible redemption and have been classified as temporary equity (see Note 7). Class B Ordinary Shares - The Company is authorized to issue 50,000,000 Class B ordinary shares with a par value of $0.0001 per share. On February 9, 2021, 10,062,500 Class B ordinary shares were issued and outstanding. On January 30, 2021, the Company effectuated a 5-for- 6 Only holders of Class B ordinary shares will have the right to vote on the election of directors prior to the initial Business Combination. Holders of the Class A ordinary shares and holders of the Class B ordinary shares will vote together as a single class on all other matters submitted to a vote of the shareholders, except as required by law. Each ordinary share will have one vote on all such matters. The Class B ordinary shares will automatically convert into Class A ordinary shares at the time of the initial business Combination, or earlier at the option of the holder, on a one-for-one basis, subject to adjustment for share sub-divisions, share dividends, rights issuances, consolidations, reorganizations, recapitalizations and the like, and subject to further adjustment as provided herein. In the case that additional Class A ordinary shares, or equity-linked securities, are issued or deemed issued in excess of the amounts issued in the Initial Public Offering and related to the closing of the initial Business Combination, the ratio at which the Class B ordinary shares will convert into Class A ordinary shares will be adjusted (unless the holders of a majority of the issued and outstanding Class B ordinary shares agree to waive such anti-dilution adjustment with respect to any such issuance or deemed issuance) so that the number of Class A ordinary shares issuable upon conversion of all Class B ordinary shares will equal, in the aggregate, on an as-converted basis, 20% of the sum of all ordinary shares issued and outstanding upon the completion of the Initial Public Offering plus all Class A ordinary shares and equity-linked securities issued or deemed issued in connection with the initial Business Combination, excluding any shares or equity-linked securities issued, or to be issued, to any seller in the initial Business Combination. In no event will the Class B ordinary shares convert into Class A ordinary shares at a rate of less than one to one.

Derivative Warrant Liabilities

Derivative Warrant Liabilities (Q3)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Derivative Warrant Liabilities [Abstract]
Derivative Warrant Liabilities	Note 8-Derivative Warrant Liabilities As of September 30, 2023 and December 31, 2022, the Company had 9,660,000 and 8,216,330 Public Warrants and Private Placement Warrants, respectively, outstanding. Public Warrants may only be exercised for a whole number of shares. No fractional Public Warrants will be issued upon separation of the Units and only whole Public Warrants will trade. The Public Warrants will become exercisable on the later of (a) 30 days after the completion of a Business Combination or (b) 12 months from the closing of the Initial Public Offering; provided in each case that the Company has an effective registration statement under the Securities Act covering the issuance of the Class A ordinary shares issuable upon exercise of the warrants and a current prospectus relating to them is available and such shares are registered, qualified or exempt from registration under the securities, or blue sky, laws of the state of residence of the holder (or the Company permits holders to exercise their warrants on a cashless basis under the circumstances specified in the warrant agreement). The Company agreed that as soon as practicable, but in no event later than 20 business days after the closing of the initial Business Combination, the Company will use its commercially reasonable efforts to file with the SEC a registration statement covering the issuance of the Class A ordinary shares issuable upon exercise of the warrants, and the Company will use its commercially reasonable efforts to cause the same to become effective within 60 business days after the closing of the initial Business Combination and to maintain the effectiveness of such registration statement and a current prospectus relating to those Class A ordinary shares until the warrants expire or are redeemed; provided that if the Class A ordinary shares are at the time of any exercise of a warrant not listed on a national securities exchange such that they satisfy the definition of a “covered security” under Section 18(b)(1) of the Securities Act, the Company may, at its option, requires holders of Public Warrants who exercise their warrants to do so on a “cashless basis” in accordance with Section 3(a)(9) of the Securities Act and, in the event the Company so elects, it will not be required to file or maintain in effect a registration statement. The warrants have an exercise price of $11.50 per share, subject to adjustments, and will expire five years after the completion of a Business Combination or earlier upon redemption or liquidation. In addition, if (x) the Company issues additional Class A ordinary shares or equity-linked securities for capital raising purposes in connection with the closing of the initial Business Combination at an issue price or effective issue price of less than $9.20 per ordinary share (with such issue price or effective issue price to be determined in good faith by the board of directors and, in the case of any such issuance to the Sponsor or its affiliates, without taking into account any Founder Shares held by the Sponsor or such affiliates, as applicable, prior to such issuance) (the “Newly Issued Price”), (y) the aggregate gross proceeds from such issuances represent more than 60% of the total equity proceeds, and interest thereon, available for the funding of the initial Business Combination on the date of the consummation of the initial Business Combination (net of redemptions), and (z) the volume weighted average trading price of Class A ordinary shares during the 20 trading day period starting on the trading day prior to the day on which the Company consummates its initial Business Combination (such price, the “Market Value”) is below $9.20 per share, the exercise price of the warrants will be adjusted (to the nearest cent) to be equal to 115% of the higher of the Market Value and the Newly Issued Price, the $18.00 per share redemption trigger price described under “Redemption of warrants for cash when the price per Class A ordinary share equals or exceeds $18.00” and “Redemption of warrants for Class A ordinary shares when the price per Class A ordinary share equals or exceeds $10.00” will be adjusted (to the nearest cent) to be equal to 180% of the higher of the Market Value and the Newly Issued Price, and the $10.00 per share redemption trigger price described under the caption “Redemption of warrants when the price per Class A ordinary share equals or exceeds $10.00” will be adjusted (to the nearest cent) to be equal to the higher of the Market Value and the Newly Issued Price. The Private Placement Warrants are identical to the Public Warrants underlying the Units sold in the Initial Public Offering, except that the Private Placement Warrants and the Class A ordinary shares issuable upon exercise of the Private Placement Warrants will not be transferable, assignable or salable until 30 days after the completion of a Business Combination, subject to certain limited exceptions. Additionally, the Private Placement Warrants will be non-redeemable so long as they are held by the initial purchasers or such purchasers’ permitted transferees. If the Private Placement Warrants are held by someone other than the Initial Shareholders or their permitted transferees, the Private Placement Warrants will be redeemable by the Company and exercisable by such holders on the same basis as the Public Warrants. Redemption of warrants for cash when the price per Class A ordinary share equals or exceeds $18.00: Once the warrants become exercisable, the Company may redeem the outstanding warrants (except as described herein with respect to the Private Placement Warrants): • in whole and not in part; • at a price of $0.01 per warrant; • upon not less than 30 days’ prior written notice of redemption to each warrant holder; and • if, and only if, the last reported sale price (the “closing price”) of Class A ordinary shares equals or exceeds $18.00 per share (as adjusted) for any 20 trading days within a 30-trading day period ending on the third trading day prior to the date on which the Company sends the notice of redemption to the warrant holders. The Company will not redeem the warrants as described above unless a registration statement under the Securities Act covering the issuance of the Class A ordinary shares issuable upon exercise of the warrants is then effective and a current prospectus relating to those Class A ordinary shares is available throughout the 30-day redemption period. If and when the warrants become redeemable by the Company, it may exercise its redemption right even if the company is unable to register or qualify the underlying securities for sale under all applicable state securities laws. Redemption of warrants for Class A ordinary shares when the price per Class A ordinary share equals or exceeds $10.00: Once the warrants become exercisable, the Company may redeem the outstanding warrants: • in whole and not in part; • at $0.10 per warrant upon a minimum of 30 days’ prior written notice of redemption provided • if, and only if, the closing price of Class A ordinary shares equals or exceeds $10.00 per Public Share (as adjusted) for any 20 trading days within the 30 - trading day period ending three trading days before the Company sends the notice of redemption to the warrant holders; and • if the closing price of the Class A ordinary shares for any 20 trading days within a 30-trading day period ending on the third trading day prior to the date on which the Company sends the notice of redemption to the warrant holders is less than $18.00 per share (as adjusted), the Private Placement Warrants must also be concurrently called for redemption on the same terms as the outstanding Public Warrants, as described above. The “fair market value” of Class A ordinary shares shall mean the average reported last sale price of Class A ordinary shares for the 10 trading days ending on the third trading day prior to the date on which the notice of redemption is sent to the holders of warrants. In no event will the Company be required to net cash settle any warrant. If the Company is unable to complete a Business Combination within the Combination Period and the Company liquidates the funds held in the Trust Account, holders of warrants will not receive any of such funds with respect to their warrants, nor will they receive any distribution from the Company’s assets held outside of the Trust Account with the respect to such warrants. Accordingly, the warrants may expire worthless.	Note 8-Derivative Warrant Liabilities As of December 31, 2022 and 2021, the Company had 9,660,000 and 8,216,330 Public Warrants and Private Placement Warrants, respectively, outstanding. As of December 31, 2020, the Company did not have any Public Warrants or Private Placement Warrants outstanding. Public Warrants may only be exercised for a whole number of shares. No fractional Public Warrants will be issued upon separation of the Units and only whole Public Warrants will trade. The Public Warrants will become exercisable on the later of (a) 30 days after the completion of a Business Combination or (b) 12 months from the closing of the Initial Public Offering; provided in each case that the Company has an effective registration statement under the Securities Act covering the issuance of the Class A ordinary shares issuable upon exercise of the warrants and a current prospectus relating to them is available and such shares are registered, qualified or exempt from registration under the securities, or blue sky, laws of the state of residence of the holder (or the Company permits holders to exercise their warrants on a cashless basis under the circumstances specified in the warrant agreement). The Company agreed that as soon as practicable, but in no event later than 20 business days after the closing of the initial Business Combination, the Company will use its commercially reasonable efforts to file with the SEC a registration statement covering the issuance of the Class A ordinary shares issuable upon exercise of the warrants, and the Company will use its commercially reasonable efforts to cause the same to become effective within 60 business days after the closing of the initial Business Combination and to maintain the effectiveness of such registration statement and a current prospectus relating to those Class A ordinary shares until the warrants expire or are redeemed; provided that if the Class A ordinary shares are at the time of any exercise of a warrant not listed on a national securities exchange such that they satisfy the definition of a “covered security” under Section 18(b)(1) of the Securities Act, the Company may, at its option, requires holders of Public Warrants who exercise their warrants to do so on a “cashless basis” in accordance with Section 3(a)(9) of the Securities Act and, in the event the Company so elects, it will not be required to file or maintain in effect a registration statement. The warrants have an exercise price of $11.50 per share, subject to adjustments, and will expire five years after the completion of a Business Combination or earlier upon redemption or liquidation. In addition, if (x) the Company The warrants have an exercise price of $11.50 per share, subject to adjustments, and will expire five years after the completion of a Business Combination or earlier upon redemption or liquidation. In addition, if (x) the Company issues additional Class A ordinary shares or equity-linked securities for capital raising purposes in connection with the closing of the initial Business Combination at an issue price or effective issue price of less than $9.20 per ordinary share (with such issue price or effective issue price to be determined in good faith by the board of directors and, in the case of any such issuance to the Sponsor or its affiliates, without taking into account any Founder Shares held by the Sponsor or such affiliates, as applicable, prior to such issuance) (the “ Newly Issued Price Market Value The Private Placement Warrants are identical to the Public Warrants underlying the Units sold in the Initial Public Offering, except that the Private Placement Warrants and the Class A ordinary shares issuable upon exercise of the Private Placement Warrants will not be transferable, assignable or salable until 30 days after the completion of a Business Combination, subject to certain limited exceptions. Additionally, the Private Placement Warrants will be non-redeemable so long as they are held by the initial purchasers or such purchasers’ permitted transferees. If the Private Placement Warrants are held by someone other than the Initial Shareholders or their permitted transferees, the Private Placement Warrants will be redeemable by the Company and exercisable by such holders on the same basis as the Public Warrants. Redemption of warrants for cash when the price per Class A ordinary share equals or exceeds $18.00: Once the warrants become exercisable, the Company may redeem the outstanding warrants (except as described herein with respect to the Private Placement Warrants): • in whole and not in part; • at a price of $0.01 per warrant; • upon not less than 30 days’ prior written notice of redemption to each warrant holder; and • if, and only if, the last reported sale price (the “closing price”) of Class A ordinary shares equals or exceeds $18.00 per share (as adjusted) for any 20 trading days within a 30-trading day period ending on the third trading day prior to the date on which the Company sends the notice of redemption to the warrant holders. The Company will not redeem the warrants as described above unless a registration statement under the Securities Act covering the issuance of the Class A ordinary shares issuable upon exercise of the warrants is then effective and a current prospectus relating to those Class A ordinary shares is available throughout the 30-day redemption period. If and when the warrants become redeemable by the Company, it may exercise its redemption right even if the company is unable to register or qualify the underlying securities for sale under all applicable state securities laws. Redemption of warrants for Class A ordinary shares when the price per Class A ordinary share equals or exceeds $10.00: Once the warrants become exercisable, the Company may redeem the outstanding warrants: • in whole and not in part; • at $0.10 per warrant upon a minimum of 30 days’ prior written notice of redemption provided • if, and only if, the closing price of Class A ordinary shares equals or exceeds $10.00 per Public Share (as adjusted) for any 20 trading days within the 30 - trading day period ending three trading days before the Company sends the notice of redemption to the warrant holders; and • if the closing price of the Class A ordinary shares for any 20 trading days within a 30-trading day period ending on the third trading day prior to the date on which the Company sends the notice of redemption to the warrant holders is less than $18.00 per share (as adjusted), the Private Placement Warrants must also be concurrently called for redemption on the same terms as the outstanding Public Warrants, as described above. The “fair market value” of Class A ordinary shares shall mean the average reported last sale price of Class A ordinary shares for the 10 trading days ending on the third trading day prior to the date on which the notice of redemption is sent to the holders of warrants. In no event will the Company be required to net cash settle any warrant. If the Company is unable to complete a Business Combination within the Combination Period and the Company liquidates the funds held in the Trust Account, holders of warrants will not receive any of such funds with respect to their warrants, nor will they receive any distribution from the Company’s assets held outside of the Trust Account with the respect to such warrants. Accordingly, the warrants may expire worthless.

Fair Value Measurements (Q3)

Fair Value Measurements (Q3)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Fair Value Measurements	Note 9-Fair Value Measurements At September 30, 2023, cash held in the Trust Account was comprised of $6,655,195 held in a demand deposit account that accrues interest monthly. During the nine months ended September 30, 2023, the Company had withdrawn $1,230,308 for working capital purposes. At December 31, 2022, assets held in the Trust Account was comprised of $487,268,822 held in money market funds which are primarily invested in U.S. Treasury securities. During the year ended December 31, 2022, the Company had withdrawn from the Trust Account $43,317 for working capital purposes. The following table presents information about the Company’s assets and liabilities that are measured at fair value on a recurring basis as of September 30, 2023 and December 31, 2022 and indicates the fair value hierarchy of the valuation techniques that the Company utilized to determine such fair value. September 30, 2023 Description ​ ​ Level 1 ​ ​ Level 2 ​ ​ Level 3 Assets: ​ ​ ​ ​ ​ ​ Cash held in Trust Account ​ ​ $6,655,195 ​ ​ $— ​ ​ $ — Liabilities: ​ ​ ​ ​ ​ ​ Derivative liabilities - Public Warrants ​ ​ $1,255,800 ​ ​ $— ​ ​ $ — Derivative liabilities - Private Warrants ​ ​ $ — ​ ​ $— ​ ​ $1,068,123 December 31, 2022 Description ​ ​ Level 1 ​ ​ Level 2 ​ ​ Level 3 Assets: ​ ​ ​ ​ ​ ​ Investments held in Trust Account - Money Market Funds ​ ​ $487,268,822 ​ ​ $— ​ ​ $ — Liabilities: ​ ​ ​ ​ ​ ​ Derivative liabilities - Public Warrants ​ ​ $ 289,800 ​ ​ $— ​ ​ $ — Derivative liabilities - Private Warrants ​ ​ $ — ​ ​ $— ​ ​ $246,500 There were no other transfers between levels for the period ended September 30, 2023 and December 31, 2022. Level 1 assets include investments in cash, money market funds and U.S. Treasury securities. The Company uses inputs such as actual trade data, benchmark yields, quoted market prices from dealers or brokers, and other similar sources to determine the fair value of its investments. The fair value of the Public Warrants issued in connection with the Initial Public Offering and Private Placement Warrants were initially measured at fair value using a Monte Carlo simulation model and subsequently, the fair value of the Private Placement Warrants have been estimated using a Monte Carlo simulation model each measurement date. For the period ended September 30, 2023 and December 31, 2022, the Company recognized a change to the statement of operations resulting from a increase/decrease in the fair value of liabilities of approximately $1.8 million and $13.8 million, respectively, presented as change in fair value of derivative warrant liabilities on the accompanying statement of operations. The estimated fair value of the Private Placement Warrants, and the Public Warrants prior to being separately listed and traded, is determined using Level 3 inputs. Inherent in a Monte Carlo simulation are assumptions related to expected share-price volatility, expected life, risk-free interest rate and dividend yield. The Company estimates the volatility for its Private Placement Warrants based on the implied volatility from the Company’s traded warrants and from historical volatility of select peer companies ordinary shares that matches the expected remaining life of the warrants. The risk-free interest rate is based on the U.S. Treasury zero-coupon yield curve on the grant date for a maturity similar to the expected remaining life of the warrants. The expected life of the warrants is assumed to be equivalent to their remaining contractual term. The dividend rate is based on the historical rate, which the Company anticipates remaining at zero. The following table provides quantitative information regarding Level 3 fair value measurements inputs at their measurement dates: Private Warrants Private Warrants ​ ​ As of December 31, 2022 ​ ​ As of September 30, 2023 Stock price ​ ​ $10.09 ​ ​ $10.55 Volatility ​ ​ 6.9% ​ ​ 6.7% Expected life of the options to convert ​ ​ 5.47 ​ ​ 0.94 Risk-free rate ​ ​ 4.73% ​ ​ 5.47% Dividend yield ​ ​ — ​ ​ — Working Capital Loan Option ​ ​ December 31, 2022 ​ ​ September 30, 2023 Strike price of debt conversion ​ ​ $1.50 ​ ​ $1.50 Volatility ​ ​ 6.9% ​ ​ 6.7% Expected life of the options to convert ​ ​ 5.47 ​ ​ 5.31 Risk-free rate ​ ​ 4.72% ​ ​ 5.55% Dividend yield ​ ​ — ​ ​ — The change in the level 3 fair value of the derivative warrant liabilities for the period ended September 30, 2023 and December 31, 2022 is summarized as follows: ​ ​ Private Warrants Derivative warrant liabilities at December 31, 2022 ​ ​ $ 246,500 Change in fair value of derivative warrant liabilities ​ ​ 944,868 Derivative warrant liabilities at March 31, 2023 ​ ​ 1,191,368 Change in fair value of derivative warrant liabilities ​ ​ (286,750) Derivative warrant liabilities at June 30, 2023 ​ ​ $ 904,618 Change in fair value of derivative warrant liabilities ​ ​ 163,505 Derivative warrant liabilities at September 30, 2023 ​ ​ $ 1,068,123 Derivative warrant liabilities at December 31, 2021 ​ ​ $ 6,573,100 Change in fair value of derivative warrant liabilities ​ ​ (2,946,400) Derivative warrant liabilities at March 31, 2022 ​ ​ 3,626,700 ​ ​ Private Warrants Change in fair value of derivative warrant liabilities ​ ​ (2,969,400) Derivative warrant liabilities at June 30, 2022 ​ ​ $ 657,300 Change in fair value of derivative warrant liabilities ​ ​ 320,400 Derivative warrant liabilities at September 30, 2022 ​ ​ $ 977,700 The change in the fair value of the Working Capital Loan Option measured with Level 3 inputs for the period ended September 30, 2023 and December 31, 2022 is summarized as follows: Balance at December 31, 2021 ​ ​ $ — Initial fair value of the Working Capital Loan Option ​ ​ 7,885 Change in fair value ​ ​ (7,885) Balance at December 31, 2022 and September 30, 2023 ​ ​ $ —	Note 9-Fair Value Measurements The following table presents information about the Company’s assets and liabilities that are measured at fair value on a recurring basis as of December 31, 2022 and 2021 and indicates the fair value hierarchy of the valuation techniques that the Company utilized to determine such fair value. DECEMBER 31, 2022 Description ​ ​ Level 1 ​ ​ Level 2 ​ ​ Level 3 Assets: ​ ​ ​ ​ ​ ​ Investments held in Trust Account - Money Market Funds ​ ​ $487,268,822 ​ ​ $— ​ ​ $ — Liabilities: ​ ​ ​ ​ ​ ​ Derivative liabilities - Public Warrants ​ ​ $ 289,800 ​ ​ $— ​ ​ $ — Derivative liabilities - Private Warrants ​ ​ $ — ​ ​ $— ​ ​ $246,500 DECEMBER 31, 2021 Description ​ ​ Level 1 ​ ​ Level 2 ​ ​ Level 3 Assets: ​ ​ ​ ​ ​ ​ Investments held in Trust Account - U.S. Treasury Securities ​ ​ $483,012,312 ​ ​ $— ​ ​ $ — Liabilities: ​ ​ ​ ​ ​ ​ Derivative liabilities - Public Warrants ​ ​ $ 7,728,000 ​ ​ $— ​ ​ $ — Derivative liabilities - Private Warrants ​ ​ $ — ​ ​ $— ​ ​ $6,573,100 Transfers to/from Levels 1, 2, and 3 are recognized at the beginning of the reporting period. The estimated fair value of the Public Warrants transferred from a Level 3 measurement to a Level 1 fair value measurement in March 2021, upon trading of the Public Warrants in an active market. There were no other transfers between levels for the years ended December 31, 2022 and 2021. Level 1 assets include investments in money market funds and U.S. Treasury securities. The Company uses inputs such as actual trade data, benchmark yields, quoted market prices from dealers or brokers, and other similar sources to determine the fair value of its investments. The fair value of the Public Warrants issued in connection with the Public Offering and Private Placement Warrants were initially measured at fair value using a Monte Carlo simulation model and subsequently, the fair value of the Private Placement Warrants have been estimated using a Monte Carlo simulation model each measurement date. For the years ended December 31, 2022 and 2021, the Company recognized a change to the statement of operations resulting from a decrease in the fair value of liabilities of approximately $13.8 million and $9.5 million, respectively, presented as change in fair value of derivative warrant liabilities on the accompanying statement of operations. The estimated fair value of the Private Placement Warrants, and the Public Warrants prior to being separately listed and traded, is determined using Level 3 inputs. Inherent in a Monte Carlo simulation are assumptions related to expected share-price volatility, expected life, risk-free interest rate and dividend yield. The Company estimates the volatility for its Private Placement Warrants based on the implied volatility from the Company’s traded warrants and from historical volatility of select peer companies ordinary shares that matches the expected remaining life of the warrants. The risk-free interest rate is based on the U.S. Treasury zero-coupon yield curve on the grant date for a maturity similar to the expected remaining life of the warrants. The expected life of the warrants is assumed to be equivalent to their remaining contractual term. The dividend rate is based on the historical rate, which the Company anticipates remaining at zero. The following table provides quantitative information regarding Level 3 fair value measurements inputs at their measurement dates: Private Warrants Private Warrants ​ ​ As of December 31, 2022 ​ ​ As of December 31, 2021 Stock price ​ ​ $10.09 ​ ​ $9.77 Volatility ​ ​ 6.9% ​ ​ 15.3% Expected life of the options to convert ​ ​ 5.47 ​ ​ 5.60 Risk-free rate ​ ​ 4.73% ​ ​ 1.32% Dividend yield ​ ​ — ​ ​ — Working Capital Loan Option ​ ​ December 31, 2022 Strike price of debt conversion ​ ​ $1.50 Volatility ​ ​ 6.9% Expected life of the options to convert ​ ​ 5.47 Risk-free rate ​ ​ 4.72% Dividend yield ​ ​ — The change in the level 3 fair value of the derivative warrant liabilities for the years ended December 31, 2022 and 2021 is summarized as follows: ​ ​ Public Warrants ​ ​ Private Warrants ​ ​ Total Derivative warrant liabilities at December 31, 2020 ​ ​ $ — ​ ​ $ — ​ ​ $ — Issuance of Public and Private Warrants ​ ​ 12,863,680 ​ ​ 10,941,230 ​ ​ 23,804,910 Transfer of Public Warrants to Level 1 ​ ​ (13,524,000) ​ ​ — ​ ​ (13,524,000) Change in fair value of derivative warrant liabilities ​ ​ 660,320 ​ ​ (4,368,130) ​ ​ (3,707,810) Derivative warrant liabilities at December 31, 2021 ​ ​ — ​ ​ 6,573,100 ​ ​ 6,573,100 Change in fair value of derivative ​ ​ — ​ ​ (6,326,600) ​ ​ (6,326,600) Derivative warrant liabilities at December 31, 2022 ​ ​ $ — ​ ​ $ 246,500 ​ ​ $ 246,500 The change in the fair value of the Working Capital Loan Option measured with Level 3 inputs for the year ended December 31, 2022 is summarized as follows: Balance at December 31, 2021 ​ ​ $ — Initial fair value of the Working Capital Loan Option ​ ​ 7,885 Change in fair value ​ ​ (7,885) Balance at December 31, 2022 ​ ​ $ —

Subsequent Events (Q3)

Subsequent Events (Q3)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Subsequent Events [Abstract]
Subsequent Events	Note 10-Subsequent Events The Company evaluated subsequent events and transactions that occurred up to the date unaudited condensed financial statements were available to be issued. Based upon this review, the Company determined that there have been no events that have occurred that would require adjustments to the disclosures in the unaudited condensed financial statements, other than as described below. Amendment to the Merger Agreement On December 15, 2023, RMG III and H2B2 entered into the Merger Agreement Amendment. The Merger Agreement Amendment, amended certain terms of the Existing Merger Agreement to reflect the following amendments, among others: • Base Purchase Price. • Closing Date Purchase Price. • AVR Option Amount. • Minimum Investment Amount. • 10% Premium. • Minimum Net Tangible Assets Condition. • Conversion of RMG III Class B Ordinary Shares. • Warrant Amendment. • Director Nominees. The Business Combination would be consummated in accordance with the terms and subject to the conditions as further described in the Merger Agreement Amendment as filed with the SEC on a Current Report on Form 8-K on December 18, 2023. Other than as expressly modified by the Merger Agreement Amendment, the Merger Agreement, which was filed as Exhibit 2.1 to the Current Report on Form 8-K filed by the Company with the SEC on May 11, 2023, remains in full force and effect.	Note 10-Subsequent Events The Company evaluated subsequent events and transactions that occurred up to the date financial statements were available to be issued. Based upon this review, the Company determined that, except as disclosed below, there have been no events that have occurred that would require adjustments to the disclosures in the financial statements, except as disclosed below. On January 4, 2023, the Company entered into a non-binding letter of intent (“ LOI H2B2 Target energy systems, services, and equipment. Under the terms of the LOI, the Company and H2B2 would be become a combined entity, with H2B2’s existing equity holders continuing to hold substantially all of their equity in the combined public company. We expect to announce additional details regarding the proposed business combination when a definitive merger agreement is executed, which is expected in the first half of 2023. On January 11, 2023, the Company held an extraordinary general meeting of shareholders for the purpose of approving an amendment to the amended and restated memorandum and articles of association to extend the date by which the Company must complete a business combination from February 9, 2023, to May 9, 2023 (the “ Extended Date First Extension In connection with the First Extension, a total of 260 shareholders elected to redeem an aggregate of 47,381,598 Class A ordinary shares, representing approximately 98.10% of our issued and outstanding Class A ordinary shares, for an aggregate of approximately $478,003,632 in cash. Subsequent to the redemption, 918,402 Class A ordinary shares remained outstanding. In March 2023, the Company borrowed $250,000 under the July 2022 Note.

Description of Organization a_2

Description of Organization and Business Operations (FY)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Organization and Business Operations	Note 1-Description of Organization and Business Operations RMG Acquisition Corp. III (the “Company”) is a blank check company, also referred to as a special purpose acquisition company, incorporated as a Cayman Islands exempted company on December 23, 2020. The Company was incorporated for the purpose of effecting a merger, share exchange, asset acquisition, share purchase, reorganization or similar business combination with one or more businesses that the Company has not yet identified (“Business Combination”). As of September 30, 2023, the Company had not yet commenced operations. All activity for the period from December 23, 2020 (inception) through September 30, 2023 relates to the Company’s formation and the initial public offering (the “Initial Public Offering”), and identifying a target company for an initial Business Combination, which is described below. The Company will not generate any operating revenues until after the completion of its initial Business Combination, at the earliest. The Company will generate non-operating income in the form of interest income on cash and cash equivalents from the proceeds derived from the Initial Public Offering. The Company has selected December 31 as its fiscal year end. The Company’s sponsor is RMG Sponsor III, LLC, a Delaware limited liability company (the “Sponsor”). The registration statement for the Company’s Initial Public Offering was declared effective on February 4, 2021. On February 9, 2021, the Company consummated its Initial Public Offering of 48,300,000 units (the “Units” and, with respect to the Class A ordinary shares included in the Units being offered, the “Public Shares”), including 6,300,000 additional Units to cover over-allotments (the “Over-Allotment Units”), at $10.00 per Unit, generating gross proceeds of $483.0 million, and incurring offering costs of approximately $27.1 million, of which approximately $16.9 million was for deferred underwriting commissions and $250,000 was for deferred legal fees (Note 7). Simultaneously with the closing of the Initial Public Offering, the Company consummated the private placement (“Private Placement”) of 8,216,330 warrants (each, a “Private Placement Warrant” and collectively, the “Private Placement Warrants”) at a price of $1.50 per Private Placement Warrant to the Sponsor, generating proceeds of approximately $12.3 million (Note 5). Upon the closing of the Initial Public Offering and the Private Placement, $483.0 million ($10.00 per Unit) of the net proceeds of the Initial Public Offering and certain of the proceeds of the Private Placement was placed in a trust account (“Trust Account”) with Continental Stock Transfer & Trust Company acting as trustee and have been invested in United States government treasury bills with a maturity of 185 days or less or in money market funds investing solely in U.S. Treasuries and meeting certain conditions under Rule 2a-7 under the Investment Company Act 1940, as amended, or the Investment Company Act, as determined by the Company, until the earlier of: (i) the completion of a Business Combination and (ii) the distribution of the Trust Account as described below. The Company’s management has broad discretion with respect to the specific application of the net proceeds of its Initial Public Offering and the sale of Private Placement Warrants, although substantially all of the net proceeds are intended to be applied generally toward consummating a Business Combination. The Company’s initial Business Combination must be with one or more operating businesses or assets with a fair market value equal to at least 80% of the net assets held in the Trust Account (excluding the deferred underwriting commissions and taxes payable on the income earned on the Trust Account) at the time the Company signs a definitive agreement in connection with the initial Business Combination. However, the Company will only complete a Business Combination if the post-transaction company owns or acquires 50% or more of the outstanding voting securities of the target or otherwise acquires a controlling interest in the target sufficient for it not to be required to register as an investment company under the Investment Company Act. The Company will provide its holders of Public Shares (the “Public Shareholders”) with the opportunity to redeem all or a portion of their Public Shares upon the completion of a Business Combination either (i) in connection with a shareholder meeting called to approve the Business Combination or (ii) by means of a tender offer. The decision as to whether the Company will seek shareholder approval of a Business Combination or conduct a tender offer will be made by the Company, solely in its discretion. The Public Shareholders will be entitled to redeem their Public Shares for a pro rata portion of the amount then in the Trust Account (initially anticipated to be $10.00 per share, plus any pro rata interest earned on the funds held in the Trust Account and not previously released to the Company to pay its tax obligations, expenses relating to the administration of the Trust Account and withdrawals for working capital). The per-share amount to be distributed to Public Shareholders who redeem their Public Shares will not be reduced by the deferred underwriting commissions the Company will pay to the underwriters (as discussed in Note 7). These Public Shares will be recorded at a redemption value and classified as temporary equity upon the completion of the Initial Public Offering, in accordance with the Financial Accounting Standards Board’s (“FASB”) Accounting Standards Codification (“ASC”) Topic 480 “Distinguishing Liabilities from Equity” (“ASC 480”). In such case, the Company will proceed with a Business Combination if the Company has net tangible assets of at least $5,000,001 upon such consummation of a Business Combination and a majority of the shares voted are voted in favor of the Business Combination. If a shareholder vote is not required by law and the Company does not decide to hold a shareholder vote for business or other legal reasons, the Company will, pursuant to the amended and restated memorandum and articles of association which will be adopted by the Company upon the consummation of the Initial Public Offering (the “Amended and Restated Memorandum and Articles of Association”), conduct the redemptions pursuant to the tender offer rules of the U.S. Securities and Exchange Commission (the “SEC”), and file tender offer documents with the SEC prior to completing a Business Combination. If, however, a shareholder approval of the transactions is required by law, or the Company decides to obtain shareholder approval for business or legal reasons, the Company will offer to redeem shares in conjunction with a proxy solicitation pursuant to the proxy rules and not pursuant to the tender offer rules. Additionally, each Public Shareholder may elect to redeem their Public Shares irrespective of whether they vote for or against the proposed transaction. If the Company seeks shareholder approval in connection with a Business Combination, the holders of the Founder Shares prior to this Initial Public Offering (the “Initial Shareholders”) agreed to vote their Founder Shares (as defined in Note 6) and any Public Shares purchased during or after the Initial Public Offering in favor of a Business Combination. In addition, the Initial Shareholders agreed to waive their redemption rights with respect to their Founder Shares and Public Shares in connection with the completion of a Business Combination. In addition, the Company agreed not to enter into a definitive agreement regarding an initial Business Combination without the prior consent of the Sponsor. Notwithstanding the foregoing, the Company’s Amended and Restated Memorandum and Articles of Association will provide that a Public Shareholder, together with any affiliate of such shareholder or any other person with whom such shareholder is acting in concert or as a “group” (as defined under Section 13 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”)), will be restricted from redeeming its shares with respect to more than an aggregate of 15% or more of the Class A ordinary shares sold in the Initial Public Offering, without the prior consent of the Company. The Company’s Sponsor, executive officers and directors agreed not to propose an amendment to the Company’s Amended and Restated Memorandum and Articles of Association that would affect the substance or timing of the Company’s obligation to provide for the redemption of its Public Shares in connection with a Business Combination or to redeem 100% of its Public Shares if the Company does not complete a Business Combination, unless the Company provides the Public Shareholders with the opportunity to redeem their Class A ordinary shares in conjunction with any such amendment. On January 11, 2023, the Company held an extraordinary general meeting of shareholders for the purpose of approving an amendment to the amended and restated memorandum and articles of association to extend the date by which the Company must complete a Business Combination from February 9, 2023, to May 9, 2023 (the “Extended Date”), and to allow the Company, without another shareholder vote, to elect to further extend the date to consummate a Business Combination up to three times by an additional month each time after the Extended Date, upon two days’ advance notice prior to the applicable deadline, for a total of up to six months, to August 9, 2023, if the Company had entered into a definitive business combination agreement (the “First Extension”). In connection with the First Extension, holders of 47,381,598 Class A ordinary shares elected to redeem their Class A ordinary shares for an aggregate of approximately $478 million in cash. On August 4, 2023, the Company held an extraordinary general meeting for the purpose of approving an amendment and restatement of the amended and restated memorandum and articles of association to extend the date by which the Company must complete a Business Combination from August 9, 2023 to February 9, 2024 (the “Second Extension”). In addition, the shareholders approved the proposal to amend and restate the Company’s charter to eliminate the limitation that the Company shall not redeem public shares to the extent that such redemptions would cause the Company’s net tangible assets to be less than $5,000,001 following such redemptions. In connection with the Second Extension, holders of 282,624 Class A ordinary shares elected to redeem their Class A ordinary shares for an aggregate of approximately $3 million in cash. If the Company is unable to complete a Business Combination by February 9, 2024, (the “Combination Period”), the Company will (1) cease all operations except for the purpose of winding up; (2) as promptly as reasonably possible but not more than 10 business days thereafter, redeem the Public Shares, at a per-share price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account, including interest (less up to $100,000 of interest to pay dissolution expenses and which interest shall be net of taxes payable, expenses relating to the administration of the Trust Account and limited withdrawals for working capital), divided by the number of then issued and outstanding Public Shares, which redemption will completely extinguish Public Shareholders’ rights as shareholders (including the right to receive further liquidating distributions, if any); and (3) as promptly as reasonably possible following such redemption, subject to the approval of the remaining shareholders and the board of directors, liquidate and dissolve, subject in each case to the Company’s obligations under Cayman Islands law to provide for claims of creditors and the requirements of other applicable law. The Initial Shareholders agreed to waive their liquidation rights with respect to the Founder Shares if the Company fails to complete a Business Combination within the Combination Period. However, if the Initial Shareholders should acquire Public Shares in or after the Initial Public Offering, they will be entitled to liquidating distributions from the Trust Account with respect to such Public Shares if the Company fails to complete a Business Combination within the Combination Period. The underwriters agreed to waive their rights to their deferred underwriting commission (see Note 7) held in the Trust Account in the event the Company does not complete a Business Combination within the Combination Period and, in such event, such amounts will be included with the funds held in the Trust Account that will be available to fund the redemption of the Company’s Public Shares. In the event of such distribution, it is possible that the per share value of the residual assets remaining available for distribution (including Trust Account assets) will be only $10.00 per share initially held in the Trust Account. In order to protect the amounts held in the Trust Account, the Sponsor agreed that it will be liable to the Company if and to the extent any claims by a third party for services rendered or products sold to the Company, or a prospective target business with which the Company has entered into a written letter of intent, confidentiality or other similar agreement or business combination agreement, reduce the amount of funds in the Trust Account to below the lesser of (i) $10.00 per Public Share and (ii) the actual amount per Public Share held in the Trust Account as of the date of the liquidation of the Trust Account, if less than $10.00 per share due to reductions in the value of the trust assets, less taxes payable, expenses relating to the administration of the Trust Account and limited withdrawals for working capital, provided that such liability will not apply to any claims by a third party or prospective target business who executed a waiver of any and all rights to the monies held in the Trust Account (whether or not such waiver is enforceable) nor will it apply to any claims under the Company’s indemnity of the underwriters of the Initial Public Offering against certain liabilities, including liabilities under the Securities Act of 1933, as amended (the “Securities Act”). In the event that an executed waiver is deemed to be unenforceable against a third party, the Sponsor will not be responsible to the extent of any liability for such third-party claims. The Company will seek to reduce the possibility that the Sponsor will have to indemnify the Trust Account due to claims of creditors by endeavoring to have vendors, service providers (except the Company’s independent registered public accounting firm), prospective target businesses or other entities with which the Company does business, execute agreements with the Company waiving any right, title, interest or claim of any kind in or to monies held in the Trust Account. On June 20, 2023, the Company received a written notice (the “Notice”) from the Listing Qualifications Department (the “Staff”) of The Nasdaq Stock Market LLC (“Nasdaq”) notifying the Company that, for the last 30 consecutive business days, the Company’s Market Value of Listed Securities (“MVLS”) was below the minimum of $35 million required for continued listing on the Nasdaq Capital Market pursuant to Nasdaq Listing Rule 5550(b)(2) (the “Market Value Standard”). The Staff also noted that the Company does not meet the requirements under Nasdaq Listing Rules 5550(b)(1) (Equity Standard) and 5550(b)(3) (Net Income Standard). The Notice does not impact the listing of the Company’s Class A ordinary shares par value $0.0001 per share (“Class A ordinary shares”), on the Nasdaq Capital Market at this time. The Notice provided that, in accordance with Nasdaq Listing Rule 5810(c)(3)(C) (the “Compliance Period Rule”), the Company has a period of 180 calendar days from the date of the Notice, or until December 18, 2023 (the “Compliance Date”), to regain compliance with the Market Value Standard. During this period, Class A ordinary shares will continue to trade on the Nasdaq Capital Market. If at any time before the Compliance Date the Company’s MVLS closes at or above $35 million for a minimum of 10 consecutive business days as required under the Compliance Period Rule, the Staff will provide written notification to the Company that it has regained compliance with the Market Value Standard and will close the matter (unless the Staff exercises its discretion to extend this 10 business day period pursuant to Nasdaq Listing Rule 5810(c)(3)(H)). If the Company does not regain compliance with the Market Value Standard by the Compliance Date, the Staff will provide a written notification to the Company that Class A ordinary shares will be subject to delisting. At that time, the Company may appeal the Staff’s delisting determination to a Hearings Panel (the “Panel”). However, there can be no assurance that, if the Company receives a delisting notice and appeals the delisting determination by the Staff to the Panel, such appeal would be successful. The Company intends to monitor its MVLS between now and the Compliance Date, and may, if appropriate, evaluate available options to resolve the deficiency under the Market Value Standard and regain compliance with the Market Value Standard. The Company may also try to comply with another Nasdaq listing criteria, such as the one under Nasdaq Listing Rule 5550(b)(1) (Equity Standard). However, there can be no assurance that the Company will be able to regain or maintain compliance with Nasdaq listing criteria. Going Concern As of September 30, 2023, the Company had approximately $311,000 in its operating bank account and a working capital deficit of approximately $7.5 million. Further, the Company has incurred and expects to continue to incur significant costs in pursuit of its financing and acquisition plans. These factors, among others, raise substantial doubt about the Company’s ability to continue as a going concern within one year after the date that the unaudited condensed financial statements are issued. The Company’s liquidity needs to date have been satisfied through a payment of $25,000 from Sponsor to cover certain expenses in exchange for the issuance of the Founder Shares (as defined in Note 4), the loan of $135,000 from the Sponsor pursuant to the Note (as defined in Note 4), the proceeds from the consummation of the Private Placement not held in the Trust Account, and the funds withdrawn from the Trust Account for working capital purposes. The Company fully repaid the Note on February 12, 2021. In addition, in order to finance transaction costs in connection with a Business Combination, the Sponsor or an affiliate of the Sponsor, or certain of the Company’s officers and directors may provide the Company Working Capital Loans (as defined in Note 4). As of September 30, 2023 and December 31, 2022, there was $850,000 and $500,000, respectively, outstanding under Working Capital Loans. Pursuant to the Investment Management Trust Agreement between the Company and Continental Stock Transfer & Trust Company, dated as of February 4, 2021 (the “Investment Management Trust Agreement”), the Company is permitted to withdraw funds for working capital requirements. These permitted withdrawals are limited to only the interest available that has been earned in excess of the initial deposit at the Initial Public Offering. As of September 30, 2023, the Company has earned a total of $5,913,216 of investment income from the Trust Account, of which a total of $4,304,076 has been withdrawn to redeeming shareholders and a total of $1,311,725 has been withdrawn for working capital purposes. As of September 30, 2023 and December 31, 2022, the Company withdrew $1,230,308 and $43,317, respectively, for working capital purposes. In connection with the Company’s assessment of going concern considerations in accordance with FASB ASC Topic 205-40, “Presentation of Financial Statements-Going Concern,” management has determined that the working capital deficit and the mandatory liquidation date and subsequent dissolution raises substantial doubt about the Company’s ability to continue as a going concern. If the Company is unable to complete a Business Combination by February 9, 2024, then the Company will cease all operations except for the purpose of liquidating. No adjustments have been made to the carrying amounts of assets or liabilities should we be required to liquidate after February 9, 2024. The unaudited condensed financial statements do not include any adjustment that might be necessary if the Company is unable to continue as a going concern.	Note 1-Description of Organization and Business Operations RMG Acquisition Corp. III (the “ Company SPAC Business Combination As of December 31, 2022, the Company had not yet commenced operations. All activity for the period from December 23, 2020 (inception) through December 31, 2022 relates to the Company’s formation and the initial public offering (the “ Initial Public Offering The Company’s sponsor is RMG Sponsor III, LLC, a Delaware limited liability company (the “ Sponsor Over-Allotment Units Simultaneously with the closing of the Initial Public Offering, the Company consummated the private placement (“ Private Placement Private Placement Warrant Private Placement Warrants Upon the closing of the Initial Public Offering and the Private Placement, $483.0 million ($10.00 per Unit) of the net proceeds of the Initial Public Offering and certain of the proceeds of the Private Placement was placed in a trust account (“ Trust Account The Company’s management has broad discretion with respect to the specific application of the net proceeds of its Initial Public Offering and the sale of Private Placement Warrants, although substantially all of the net proceeds are intended to be applied generally toward consummating a Business Combination. The Company’s initial Business Combination must be with one or more operating businesses or assets with a fair market value equal to at least 80% of the net assets held in the Trust Account (excluding the deferred underwriting commissions and taxes payable on the income earned on the Trust Account) at the time the Company signs a definitive agreement in connection with the initial Business Combination. However, the Company will only complete a Business Combination if the post-transaction company owns or acquires 50% or more of the outstanding voting securities of the target or otherwise acquires a controlling interest in the target sufficient for it not to be required to register as an investment company under the Investment Company Act. The Company will provide its holders of Public Shares (the “ Public Shareholders not previously released to the Company to pay its tax obligations, expenses relating to the administration of the trust account and limited withdrawals for working capital). The per-share amount to be distributed to Public Shareholders who redeem their Public Shares will not be reduced by the deferred underwriting commissions the Company will pay to the underwriters (as discussed in Note 7). These Public Shares will be recorded at a redemption value and classified as temporary equity upon the completion of the Initial Public Offering, in accordance with the Financial Accounting Standards Board’s (“ FASB ASC ASC 480 Amended and Restated Memorandum and Articles of Association SEC Initial Shareholders Notwithstanding the foregoing, the Company’s Amended and Restated Memorandum and Articles of Association will provide that a Public Shareholder, together with any affiliate of such shareholder or any other person with whom such shareholder is acting in concert or as a “group” (as defined under Section 13 of the Securities Exchange Act of 1934, as amended (the “ Exchange Act The Company’s Sponsor, executive officers and directors agreed not to propose an amendment to the Company’s Amended and Restated Memorandum and Articles of Association that would affect the substance or timing of the Company’s obligation to provide for the redemption of its Public Shares in connection with a Business Combination or to redeem 100% of its Public Shares if the Company does not complete a Business Combination, unless the Company provides the Public Shareholders with the opportunity to redeem their Class A ordinary shares in conjunction with any such amendment. If the Company is unable to complete a Business Combination by May 9, 2023 or, if the Company has entered into a definitive business combination agreement, August 9, 2023, (the “ Combination Period The Initial Shareholders agreed to waive their liquidation rights with respect to the Founder Shares if the Company fails to complete a Business Combination within the Combination Period. However, if the Initial Shareholders should acquire Public Shares in or after the Initial Public Offering, they will be entitled to liquidating distributions from the Trust Account with respect to such Public Shares if the Company fails to complete a Business Combination within the Combination Period. The underwriters agreed to waive their rights to their deferred underwriting commission (see Note 7) held in the Trust Account in the event the Company does not complete a Business Combination within the Combination Period and, in such event, such amounts will be included with the funds held in the Trust Account that will be available to fund the redemption of the Company’s Public Shares. In the event of such distribution, it is possible that the per share value of the residual assets remaining available for distribution (including Trust Account assets) will be only $10.00 per share initially held in the Trust Account. In order to protect the amounts held in the Trust Account, the Sponsor agreed that it will be liable to the Company if and to the extent any claims by a third party for services rendered or products sold to the Company, or a prospective target business with which the Company has entered into a written letter of intent, confidentiality or other similar agreement or business combination agreement, reduce the amount of funds in the Trust Account to below the lesser of (i) $10.00 per Public Share and (ii) the actual amount per Public Share held in the Trust Account as of the date of the liquidation of the Trust Account, if less than $10.00 per share due to reductions in the value of the trust assets, less taxes payable, expenses relating to the administration of the trust account and limited withdrawals for working capital, provided that such liability will not apply to any claims by a third party or prospective target business who executed a waiver of any and all rights to the monies held in the Trust Account (whether or not such waiver is enforceable) nor will it apply to any claims under the Company’s indemnity of the underwriters of the Initial Public Offering against certain liabilities, including liabilities under the Securities Act of 1933, as amended (the “ Securities Act Going Concern As of December 31, 2022, the Company had approximately $22,000 in its operating bank account and a working capital deficit of approximately $1.1 million. Further, the Company has incurred and expects to continue to incur significant costs in pursuit of its financing and acquisition plans. These factors, among others, raise substantial doubt about the Company’s ability to continue as a going concern within one year after the date that the financial statements are issued. The Company’s liquidity needs to date have been satisfied through a payment of $25,000 from Sponsor to cover certain expenses in exchange for the issuance of the Founder Shares (as defined in Note 4), the loan of $135,000 from the Sponsor pursuant to the Note (as defined in Note 4), and the proceeds from the consummation of the Private Placement not held in the Trust Account. The Company fully repaid the Note on February 12, 2021. In addition, in order to finance transaction costs in connection with a Business Combination, the Sponsor or an affiliate of the Sponsor, or certain of the Company’s officers and directors may provide the Company Working Capital Loans (as defined in Note 4). As of December 31, 2022 and 2021, there was $500,000 and $0, respectively, outstanding under any Working Capital Loan. In connection with the Company’s assessment of going concern considerations in accordance with FASB ASC Topic 205-40, “Presentation of Financial Statements-Going Concern,” management has determined that the working capital deficit and the mandatory liquidation date and subsequent dissolution raises substantial doubt about the Company’s ability to continue as a going concern. If the Company is unable to complete a business combination by May 9, 2023 (unless such a period is extended as described herein), then the Company will cease all operations except for the purpose of liquidating. No adjustments have been made to the carrying amounts of assets or liabilities should we be required to liquidate after May 9, 2023 or, if we have entered into a definitive business combination agreement, August 9, 2023. The financial statements do not include any adjustment that might be necessary if the Company is unable to continue as a going concern.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (FY)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Summary of Significant Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Note 2-Summary of Significant Accounting Policies Basis of Presentation The accompanying unaudited condensed financial statements of the Company are presented in U.S. dollars and have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information and Article 10 of Regulation S-X. Accordingly, certain disclosures included in the annual financial statements have been condensed or omitted from these financial statements as they are not required for interim financial statements under GAAP and the rules of the SEC. In the opinion of management, the unaudited condensed financial statements reflect all adjustments, which include only normal recurring adjustments necessary for the fair statement of the balances and results for the periods presented. Operating results for the three and nine months ended September 30, 2023 are not necessarily indicative of the results that may be expected for the year ended December 31, 2023. The accompanying unaudited condensed financial statements should be read in conjunction with the audited financial statements and notes thereto included in the Annual Report on Form 10-K filed by the Company with the SEC on April 18, 2023. Emerging Growth Company The Company is an “emerging growth company,” as defined in Section 2(a) of the Securities Act, as modified by the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”), and it may take advantage of certain exemptions from various reporting requirements that are applicable to other public companies that are not emerging growth companies including, but not limited to, not being required to comply with the independent registered public accounting firm attestation requirements of Section 404 of the Sarbanes-Oxley Act, reduced disclosure obligations regarding executive compensation in its periodic reports and proxy statements, and exemptions from the requirements of holding a nonbinding advisory vote on executive compensation and shareholder approval of any golden parachute payments not previously approved. Further, Section 102(b)(1) of the JOBS Act exempts emerging growth companies from being required to comply with new or revised financial accounting standards until private companies (that is, those that have not had a Securities Act registration statement declared effective or do not have a class of securities registered under the Exchange Act) are required to comply with the new or revised financial accounting standards. The JOBS Act provides that an emerging growth company can elect to opt out of the extended transition period and comply with the requirements that apply to non-emerging growth companies but any such an election to opt out is irrevocable. The Company has elected not to opt out of such extended transition period, which means that when a standard is issued or revised and it has different application dates for public or private companies, the Company, as an emerging growth company, can adopt the new or revised standard at the time private companies adopt the new or revised standard. This may make comparison of the Company’s financial statement with another public company that is neither an emerging growth company nor an emerging growth company that has opted out of using the extended transition period difficult or impossible because of the potential differences in accounting standards used. Concentration of Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist of cash accounts in a financial institution, which, at times, may exceed the Federal Depository Insurance Coverage limit of $250,000. As of September 30, 2023 and December 31, 2022, the Company has not experienced losses on these accounts and management believes the Company is not exposed to significant risks on such accounts. Cash and Cash Equivalents The Company considers all short-term investments with an original maturity of three months or less when purchased to be cash equivalents. The Company had no cash equivalents as of September 30, 2023 and December 31, 2022. Cash and Investments Held in Trust Account The Company’s portfolio of investments is comprised of cash and U.S. government securities, within the meaning set forth in Section 2(a)(16) of the Investment Company Act, with a maturity of 185 days or less, or investments in money market funds that invest in U.S. government securities and generally have a readily determinable fair value, or a combination thereof. Cash held in the Trust Account is in a demand deposit account that accrues interest monthly. When the Company’s investments held in the Trust Account are comprised of U.S. government securities, the investments are classified as trading securities. When the Company’s investments held in the Trust Account are comprised of money market funds, the investments are recognized at fair value. Trading securities and investments in money market funds are presented on the balance sheets at fair value at the end of each reporting period. Gains and losses resulting from the change in fair value of these securities is included in unrealized gain on investments held in Trust Account in the accompanying statements of operations. The estimated fair values of investments held in the Trust Account are determined using available market information, other than for investments in open-ended money market funds with published daily net asset values (“NAV”), in which case the Company uses NAV as a practical expedient to fair value. The NAV on these investments is typically held constant at $1.00 per unit. The Trust Account may also contain balances of cash as result of investment activity. Use of Estimates The preparation of unaudited condensed financial statements in conformity with U.S. GAAP requires the Company’s management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statement. Making estimates requires management to exercise significant judgment. It is at least reasonably possible that the estimate of the effect of a condition, situation or set of circumstances that existed at the date of the financial statement, which management considered in formulating its estimate, could change in the near term due to one or more future confirming events. Accordingly, the actual results could differ significantly from those estimates. Fair Value of Financial Instruments The fair value of the Company’s assets and liabilities, which qualify as financial instruments under the FASB ASC Topic 820, “Fair Value Measurements,” approximates the carrying amounts represented in the balance sheet. Fair Value Measurements Fair value is defined as the price that would be received for sale of an asset or paid for transfer of a liability, in an orderly transaction between market participants at the measurement date. GAAP establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). These tiers include: • Level 1, defined as observable inputs such as quoted prices for identical instruments in active markets; • Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable such as quoted prices for similar instruments in active markets or quoted prices for identical or similar instruments in markets that are not active; and • Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions, such as valuations derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable. In some circumstances, the inputs used to measure fair value might be categorized within different levels of the fair value hierarchy. In those instances, the fair value measurement is categorized in its entirety in the fair value hierarchy based on the lowest level input that is significant to the fair value measurement. Working Capital Loan Option On January 19, 2022, the Sponsor agreed to loan the Company up to $500,000 to be used for a portion of the expenses of the Company. On July 27, 2022, the Sponsor agreed to loan the Company up to $475,000. The notes are due upon consummation of our Business Combination, without interest. At the option of the Sponsor, the outstanding principle of the notes may be converted into that number of warrants (“Conversion Warrants”) equal to the outstanding principle of the note divided by $1.50. The option (“Working Capital Loan Option”) to convert the working capital loans into warrants qualifies as an embedded derivative under ASC 815 and is required to be recognized at fair value with subsequent changes in fair value recognized in Company’s statements of operations each reporting period until the loan is repaid or converted. As of September 30, 2023 and December 31, 2022, the fair value of the Working Capital Loan Option was $0, and the Working Capital Loan is held at cost of $850,000 and $500,000, respectively, see Note 9. Derivative Warrant Liabilities The Company does not use derivative instruments to hedge exposures to cash flow, market, or foreign currency risks. The Company evaluates all of its financial instruments, including issued share purchase warrants, to determine if such instruments are derivatives or contain features that qualify as embedded derivatives, pursuant to FASB ASC Topic 480 and ASC Topic 815, “Derivatives and Hedging” (“ASC 815”). The classification of derivative instruments, including whether such instruments should be recorded as liabilities or as equity, is re-assessed at the end of each reporting period. The warrants issued in the Initial Public Offering (the “Public Warrants”) and the Private Placement Warrants are recognized as derivative liabilities in accordance with ASC 815. Accordingly, the Company recognizes the warrant instruments as liabilities at fair value and adjust the instruments to fair value at each reporting period. The liabilities are subject to remeasurement at each balance sheet date until exercised, and any change in fair value is recognized in the Company’s statement of operations. The fair value of warrants issued in connection with the Initial Public Offering and Private Placement were initially measured at fair value using a Monte Carlo simulation model and subsequently, the fair value of the Private Placement warrants have been estimated using a Monte Carlo simulation model each measurement date. The fair value of Warrants issued in connection with our Initial Public Offering have subsequently been measured based on the listed market price of such warrants. Offering Costs Associated with the Initial Public Offering Offering costs consisted of legal, accounting, underwriting and other costs incurred in connection with the Initial Public Offering that were directly related to the Initial Public Offering. Offering costs were allocated to the separable financial instruments issued in the Initial Public Offering based on a relative fair value basis, compared to total proceeds received. Offering costs associated with derivative warrant liabilities were expensed as incurred and presented as non-operating expenses in the statements of operations. Offering costs associated with the issuance of the Class A ordinary shares were charged against the carrying value of the Class A ordinary shares subject to possible redemption upon the completion of the Initial Public Offering. The Company classifies deferred underwriting commissions as non-current liabilities as their liquidation is not reasonably expected to require the use of current assets or require the creation of current liabilities. Class A Ordinary Shares Subject to Possible Redemption The Company accounts for its Class A ordinary shares subject to possible redemption in accordance with ASC 480. Class A ordinary shares subject to mandatory redemption (if any) are classified as liability instruments and are measured at fair value. Conditionally redeemable Class A ordinary shares (including Class A ordinary shares that feature redemption rights that are either within the control of the holder or subject to redemption upon the occurrence of uncertain events not solely within the Company’s control) are classified as temporary equity. At all other times, Class A ordinary shares are classified as shareholders’ equity. The Company’s Class A ordinary shares feature certain redemption rights that are considered to be outside of the Company’s control and subject to the occurrence of uncertain future events. Accordingly, as of September 30, 2023 and December 31, 2022, 635,778 and 48,300,000 Class A ordinary shares subject to possible redemption, respectively, are presented at redemption value as temporary equity, outside of the shareholders’ equity section of the Company’s balance sheet. Effective with the closing of the Initial Public Offering, the Company recognized the accretion from initial book value to redemption amount, which resulted in charges against additional paid-in capital (to the extent available) and accumulated deficit. Income Taxes The Company complies with the accounting and reporting requirements of ASC Topic 740, “Income Taxes” (“ASC 740”), which requires an asset and liability approach to financial accounting and reporting for income taxes. Deferred income tax assets and liabilities are computed for differences between the financial statement and tax bases of assets and liabilities that will result in future taxable or deductible amounts, based on enacted tax laws and rates applicable to the periods in which the differences are expected to affect taxable income. Valuation allowances are established, when necessary, to reduce deferred tax assets to the amount expected to be realized. ASC 740 prescribes a recognition threshold and a measurement attribute for the financial statement recognition and measurement of tax positions taken or expected to be taken in a tax return. For those benefits to be recognized, a tax position must be more-likely-than-not to be sustained upon examination by taxing authorities. The Company’s management determined that the Cayman Islands is the Company’s only major tax jurisdiction. The Company recognizes accrued interest and penalties related to unrecognized tax benefits as income tax expense. There were no unrecognized tax benefits and no amounts accrued for interest and penalties as of September 30, 2023. The Company is currently not aware of any issues under review that could result in significant payments, accruals or material deviation from its position. There is currently no taxation imposed on income by the Government of the Cayman Islands. In accordance with Cayman federal income tax regulations, income taxes are not levied on the Company. Consequently, income taxes are not reflected in the Company’s financial statement. The Company’s management does not expect that the total amount of unrecognized tax benefits will materially change over the next twelve months. Net (Loss) Income Per Ordinary Share The Company has two classes of shares issued and outstanding: Class A ordinary shares and Class B ordinary shares. Income and losses are shared pro rata between the two classes of shares. Net (loss) income per ordinary share is computed by dividing net (loss) income by the weighted-average number of ordinary shares outstanding during the periods. The Company has not considered the effect of the warrants sold in the Initial Public Offering and the Private Placement to purchase an aggregate of 17,876,330, of the Company’s Class A ordinary shares in the calculation of diluted net (loss) income per share, because their exercise is contingent upon future events and their inclusion would be anti-dilutive under the treasury stock method. As a result, diluted net (loss) income per share is the same as basic net (loss) income per share for the three and nine months ended September 30, 2023 and 2022. Accretion associated with the Class A ordinary shares subject to possible redemption is excluded from earnings per share, as the redemption value approximates fair value. The following table presents a reconciliation of the numerator and denominator used to compute basic and diluted net (loss) income per share for each ordinary share class. ​ ​ For the Three Months Ended September 30, ​ ​ For the Nine Months Ended September 30, ​ ​ 2023 ​ ​ 2022 ​ ​ 2023 ​ ​ 2022 ​ ​ Class A ​ ​ Class B ​ ​ Class A ​ ​ Class B ​ ​ Class A ​ ​ Class B ​ ​ Class A ​ ​ Class B Basic and diluted net (loss) income per common share: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Numerator: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allocation of net (loss) income ​ ​ $(101,278) ​ ​ $ (1,645,286) ​ ​ $ 949,460 ​ ​ $ 237,365 ​ ​ $(1,450,300) ​ ​ $ (6,325,489) ​ $10,917,529 ​ ​ $ 2,729,382 Denominator: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Basic and diluted weighted average common shares outstanding ​ ​ 743,298 ​ ​ 12,075,000 ​ ​ 48,300,000 ​ ​ 12,075,000 ​ ​ 2,768,541 ​ ​ 12,075,000 ​ ​ 48,300,000 ​ ​ 12,075,000 Basic and diluted net (loss) income per common share ​ ​ $ (0.14) ​ ​ $ (0.14) ​ ​ $ 0.02 ​ ​ $ 0.02 ​ ​ $ (0.52) ​ ​ $ (0.52) ​ ​ $ 0.23 ​ ​ $ 0.23 Recent Accounting Pronouncements The Company’s management does not believe there are any recently issued, but not yet effective, accounting pronouncements if currently adopted would have a material effect on the Company’s unaudited condensed financial statements.	Note 2-Summary of Significant Accounting Policies Basis of Presentation The accompanying financial statements are presented in U.S. dollars in conformity with accounting principles generally accepted in the United States of America (“ GAAP Emerging Growth Company The Company is an “emerging growth company,” as defined in Section 2(a) of the Securities Act, as modified by the Jumpstart Our Business Startups Act of 2012 (the “ JOBS Act Further, Section 102(b)(1) of the JOBS Act exempts emerging growth companies from being required to comply with new or revised financial accounting standards until private companies (that is, those that have not had a Securities Act registration statement declared effective or do not have a class of securities registered under the Exchange Act) are required to comply with the new or revised financial accounting standards. The JOBS Act provides that an emerging growth company can elect to opt out of the extended transition period and comply with the requirements that apply to non-emerging growth companies but any such an election to opt out is irrevocable. The Company has elected not to opt out of such extended transition period, which means that when a standard is issued or revised and it has different application dates for public or private companies, the Company, as an emerging growth company, can adopt the new or revised standard at the time private companies adopt the new or revised standard. This may make comparison of the Company’s financial statement with another public company that is neither an emerging growth company nor an emerging growth company that has opted out of using the extended transition period difficult or impossible because of the potential differences in accounting standards used. Concentration of Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist of cash accounts in a financial institution, which, at times, may exceed the Federal Depository Insurance Coverage limit of $250,000. As of December 31, 2022 and 2021, the Company has not experienced losses on these accounts and management believes the Company is not exposed to significant risks on such accounts. Cash and Cash Equivalents The Company considers all short-term investments with an original maturity of three months or less when purchased to be cash equivalents. The Company had no cash equivalents as of December 31, 2022 and 2021. Investments Held in Trust Account The Company’s portfolio of investments is comprised of U.S. government securities, within the meaning set forth in Section 2(a)(16) of the Investment Company Act, with a maturity of 185 days or less, or investments in money market funds that invest in U.S. government securities and generally have a readily determinable fair value, or a combination thereof. When the Company’s investments held in the Trust Account are comprised of U.S. government securities, the investments are classified as trading securities. When the Company’s investments held in the Trust Account are comprised of money market funds, the investments are recognized at fair value. Trading securities and investments in money market funds are presented on the balance sheets at fair value at the end of each reporting period. Gains and losses resulting from the change in fair value of these securities is included in unrealized gain on investments held in Trust Account in the accompanying statements of operations. The estimated fair values of investments held in the Trust Account are determined using available market information, other than for investments in open-ended money market funds with published daily net asset values (“ NAV Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires the Company’s management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statement. Making estimates requires management to exercise significant judgment. It is at least reasonably possible that the estimate of the effect of a condition, situation or set of circumstances that existed at the date of the financial statement, which management considered in formulating its estimate, could change in the near term due to one or more future confirming events. Accordingly, the actual results could differ significantly from those estimates. Fair Value of Financial Instruments The fair value of the Company’s assets and liabilities, which qualify as financial instruments under the FASB ASC Topic 820, “Fair Value Measurements,” approximates the carrying amounts represented in the balance sheet. Fair Value Measurements Fair value is defined as the price that would be received for sale of an asset or paid for transfer of a liability, in an orderly transaction between market participants at the measurement date. GAAP establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). These tiers include: • Level 1, defined as observable inputs such as quoted prices for identical instruments in active markets; • Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable such as quoted prices for similar instruments in active markets or quoted prices for identical or similar instruments in markets that are not active; and • Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions, such as valuations derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable. In some circumstances, the inputs used to measure fair value might be categorized within different levels of the fair value hierarchy. In those instances, the fair value measurement is categorized in its entirety in the fair value hierarchy based on the lowest level input that is significant to the fair value measurement. Working Capital Loan Option On January 19, 2022, the Sponsor agreed to loan the Company up to $500,000 to be used for a portion of the expenses of the Company. The note is due upon consummation of our Business Combination, without interest. At the option of the Sponsor, the outstanding principle of $500,000 may be converted into that number of warrants (“ Conversion Warrants Working Capital Loan Option under ASC 815 and is required to be recognized at fair value with subsequent changes in fair value recognized in Company’s statements of operations each reporting period until the loan is repaid or converted. As of December 31, 2022, the fair value of the Working Capital Loan Option was $500,000, see Note 9. Derivative Warrant Liabilities The Company does not use derivative instruments to hedge exposures to cash flow, market, or foreign currency risks. The Company evaluates all of its financial instruments, including issued share purchase warrants, to determine if such instruments are derivatives or contain features that qualify as embedded derivatives, pursuant to FASB ASC Topic 480 and ASC Topic 815, “Derivatives and Hedging” (“ ASC 815 The warrants issued in the Initial Public Offering (the “ Public Warrants Offering Costs Associated with the Initial Public Offering Offering costs consisted of legal, accounting, underwriting and other costs incurred in connection with the Initial Public Offering that were directly related to the Initial Public Offering. Offering costs were allocated to the separable financial instruments issued in the Initial Public Offering based on a relative fair value basis, compared to total proceeds received. Offering costs associated with derivative warrant liabilities were expensed as incurred and presented as non-operating expenses in the statements of operations. Offering costs associated with the issuance of the Class A ordinary shares were charged against the carrying value of the Class A ordinary shares subject to possible redemption upon the completion of the Initial Public Offering. The Company classifies deferred underwriting commissions as non-current liabilities as their liquidation is not reasonably expected to require the use of current assets or require the creation of current liabilities. Class A Ordinary Shares Subject to Possible Redemption The Company accounts for its Class A ordinary shares subject to possible redemption in accordance with ASC 480. Class A ordinary shares subject to mandatory redemption (if any) are classified as liability instruments and are measured at fair value. Conditionally redeemable Class A ordinary shares (including Class A ordinary shares that feature redemption rights that are either within the control of the holder or subject to redemption upon the occurrence of uncertain events not solely within the Company’s control) are classified as temporary equity. At all other times, Class A ordinary shares are classified as shareholders’ equity. The Company’s Class A ordinary shares feature certain redemption rights that are considered to be outside of the Company’s control and subject to the occurrence of uncertain future events. Accordingly, as of December 31, 2022 and 2021, 48,300,000 Class A ordinary shares subject to possible redemption are presented at redemption value as temporary equity, outside of the shareholders’ equity section of the Company’s balance sheet. Effective with the closing of the Initial Public Offering, the Company recognized the accretion from initial book value to redemption amount, which resulted in charges against additional paid-in capital (to the extent available) and accumulated deficit. Income Taxes The Company complies with the accounting and reporting requirements of ASC Topic 740, “Income Taxes” (“ ASC 740 tax bases of assets and liabilities that will result in future taxable or deductible amounts, based on enacted tax laws and rates applicable to the periods in which the differences are expected to affect taxable income. Valuation allowances are established, when necessary, to reduce deferred tax assets to the amount expected to be realized. ASC 740 prescribes a recognition threshold and a measurement attribute for the financial statement recognition and measurement of tax positions taken or expected to be taken in a tax return. For those benefits to be recognized, a tax position must be more-likely-than-not to be sustained upon examination by taxing authorities. The Company’s management determined that the Cayman Islands is the Company’s only major tax jurisdiction. The Company recognizes accrued interest and penalties related to unrecognized tax benefits as income tax expense. There were no unrecognized tax benefits and no amounts accrued for interest and penalties as of December 31, 2022 and 2021. The Company is currently not aware of any issues under review that could result in significant payments, accruals or material deviation from its position. There is currently no taxation imposed on income by the Government of the Cayman Islands. In accordance with Cayman federal income tax regulations, income taxes are not levied on the Company. Consequently, income taxes are not reflected in the Company’s financial statement. The Company’s management does not expect that the total amount of unrecognized tax benefits will materially change over the next twelve months. Net Income per Ordinary Share The Company has two classes of shares issued and outstanding: Class A ordinary shares and Class B ordinary shares. Income and losses are shared pro rata between the two classes of shares. Net income per ordinary share is computed by dividing net income by the weighted-average number of ordinary shares outstanding during the periods. The Company has not considered the effect of the warrants sold in the Initial Public Offering and the Private Placement to purchase an aggregate of 17,876,330, of the Company’s Class A ordinary shares in the calculation of diluted net income per share, because their exercise is contingent upon future events and their exercise is contingent upon future events. As a result, diluted net income per share is the same as basic net income per share for the years ended December 31, 2022 and 2021. Accretion associated with the Class A ordinary shares subject to possible redemption is excluded from earnings per share, as the redemption value approximates fair value. The following table presents a reconciliation of the numerator and denominator used to compute basic and diluted net income per share for each ordinary share class: ​ ​ For the Year Ended December 31, 2022 ​ ​ For the Year Ended December 31, 2021 ​ ​ Class A ​ ​ Class B ​ ​ Class A ​ ​ Class B Basic and diluted net income per common share: ​ ​ ​ ​ ​ ​ ​ ​ Numerator: ​ ​ ​ ​ ​ ​ ​ ​ Allocation of net income (loss) ​ ​ $12,700,862 ​ ​ $ 3,175,215 ​ ​ $ 5,468,324 ​ ​ $ 1,509,295 Denominator: ​ ​ ​ ​ ​ ​ ​ ​ Basic and diluted weighted average common shares outstanding ​ ​ 48,300,000 ​ ​ 12,075,000 ​ ​ 43,139,178 ​ ​ 11,906,712 Basic and diluted net income per common share ​ ​ $ 0.26 ​ ​ $ 0.26 ​ ​ $ 0.13 ​ ​ $ 0.13 Recent Accounting Pronouncements The Company’s management does not believe there are any recently issued, but not yet effective, accounting pronouncements if currently adopted would have a material effect on the Company’s financial statements.

Initial Public Offering (FY)

Initial Public Offering (FY)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Initial Public Offering
Initial Public Offering	Note 3-Initial Public Offering On February 9, 2021, the Company consummated its Initial Public Offering of 48,300,000 Units, including 6,300,000 Over-Allotment Units, at $10.00 per Unit, generating gross proceeds of $483.0 million, and incurring offering costs of approximately $27.1 million, of which approximately $16.9 million was for deferred underwriting commissions and $250,000 was for deferred legal fees. Each Unit consists of one Class A ordinary share and one-fifth	Note 3-Initial Public Offering On February 9, 2021, the Company consummated its Initial Public Offering of 48,300,000 Units, including 6,300,000 Over-Allotment Units, at $10.00 per Unit, generating gross proceeds of $483.0 million, and incurring offering costs of approximately $27.1 million, of which approximately $16.9 million was for deferred underwriting commissions and $250,000 was for deferred legal fees. Each Unit consists of one Class A ordinary share and one-fifth Public Warrant

Related Party Transactions (FY)

Related Party Transactions (FY)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Related Party Transactions [Abstract]
Related Party Transactions	Note 4-Related Party Transactions Founder Shares In December 2020, the Sponsor paid an aggregate of $25,000 to cover certain expenses on behalf of the Company in exchange for issuance of 10,062,500 ordinary shares (the “Founder Shares”). On January 30, 2021, the Company effectuated a 5-for-6 The Initial Shareholders agreed not to transfer, assign or sell any of their Founder Shares until the earlier to occur of (1) one year after the completion of the initial Business Combination; and (2) subsequent to the initial Business Combination (x) if the last reported sale price of Class A ordinary shares equals or exceeds $12.00 per share (as adjusted for share sub-divisions, share dividends, rights issuances, consolidations, reorganizations, recapitalizations and the like) for any 20 trading days within any 30-trading day period commencing at least 150 days after the initial Business Combination or (y) the date on which the Company completes a liquidation, merger, amalgamation, share exchange, reorganization or other similar transaction that results in all of the Public Shareholders having the right to exchange their ordinary shares for cash, securities or other property. Private Placement Warrants Simultaneously with the closing of the Initial Public Offering, the Company consummated the Private Placement of 8,216,330 Private Placement Warrants at a price of $1.50 per Private Placement Warrant to the Sponsor, generating proceeds of approximately $12.3 million. Each whole Private Placement Warrant is exercisable for one whole share of Class A ordinary shares at a price of $11.50 per share. A portion of the proceeds from the sale of the Private Placement Warrants to the Sponsor was added to the proceeds from the Initial Public Offering held in the Trust Account. If the Company does not complete a Business Combination within the Combination Period, the Private Placement Warrants will expire worthless. The Private Placement Warrants will be non-redeemable for cash and exercisable on a cashless basis so long as they are held by the Sponsor or its permitted transferees. The Sponsor and the Company’s officers and directors agreed, subject to limited exceptions, not to transfer, assign or sell any of their Private Placement Warrants until 30 days after the completion of the initial Business Combination. Related Party Loans In order to finance transaction costs in connection with a Business Combination, the Sponsor, members of the Company’s founding team or any of their affiliates may, but are not obligated to, loan the Company funds as may be required (“ Working Capital Loans On December 30, 2020, the Sponsor agreed to loan the Company up to $300,000 to be used for the payment of costs related to the Initial Public Offering pursuant to a promissory note (the “ Note On January 19, 2022, the Sponsor agreed to loan the Company up to $500,000 to be used for a portion of the expenses of the Company (the “ January 2022 Note On July 27, 2022, the Sponsor agreed to loan the Company up to $475,000 pursuant to an unsecured, non-interest bearing promissory note (the “ July 2022 Note As of September 30, 2023 and December 31, 2022, the Company had $850,000 and $500,000, respectively, in total borrowings outstanding under the Working Capital Loans. As of September 30, 2023 and December 31, 2022, the carrying value and the principal value of the loan Administrative Services Agreement Commencing on the effective date of the Registration Statement, the Company agreed to pay an affiliate of the Sponsor a total of $20,000 per month for office space, administrative and support services (including salaries). Upon the Company’s liquidation, the Company will cease paying these monthly fees. Upon completion of the initial Business Combination, the Company will pay to such affiliate an amount equal to $20,000 multiplied by the number of whole months that have elapsed between the date of the completion of the initial Business Combination and the closing of the Initial Public Offering. The Company incurred $60,000 and $180,000 in expenses The Sponsor, officers and directors, or any of their respective affiliates, will be reimbursed for any out-of-pocket expenses incurred in connection with activities on the Company’s behalf such as identifying potential target businesses and performing due diligence on suitable business combinations. The audit committee will review on a quarterly basis all payments that were made by us to the Sponsor, directors, officers or the Company’s or any of their respective affiliates.	Note 4-Related Party Transactions Founder Shares In December 2020, the Sponsor paid an aggregate of $25,000 to cover certain expenses on behalf of the Company in exchange for issuance of 10,062,500 ordinary shares (the “ Founder Shares 5-for-6 The Initial Shareholders agreed not to transfer, assign or sell any of their Founder Shares until the earlier to occur of (1) one year after the completion of the initial Business Combination; and (2) subsequent to the initial Business Combination (x) if the last reported sale price of Class A ordinary shares equals or exceeds $12.00 per share (as adjusted for share sub-divisions, share dividends, rights issuances, consolidations, reorganizations, recapitalizations and the like) for any 20 trading days within any 30-trading day period commencing at least 150 days after the initial Business Combination or (y) the date on which the Company completes a liquidation, merger, amalgamation, share exchange, reorganization or other similar transaction that results in all of the Public Shareholders having the right to exchange their ordinary shares for cash, securities or other property. Private Placement Warrants Simultaneously with the closing of the Initial Public Offering, the Company consummated the Private Placement of 8,216,330 Private Placement Warrants at a price of $1.50 per Private Placement Warrant to the Sponsor, generating proceeds of approximately $12.3 million. Each whole Private Placement Warrant is exercisable for one whole share of Class A ordinary shares at a price of $11.50 per share. A portion of the proceeds from the sale of the Private Placement Warrants to the Sponsor was added to the proceeds from the Initial Public Offering held in the Trust Account. If the Company does not complete a Business Combination within the Combination Period, the Private Placement Warrants will expire worthless. The Private Placement Warrants will be non-redeemable for cash and exercisable on a cashless basis so long as they are held by the Sponsor or its permitted transferees. The Sponsor and the Company’s officers and directors agreed, subject to limited exceptions, not to transfer, assign or sell any of their Private Placement Warrants until 30 days after the completion of the initial Business Combination. Related Party Loans In order to finance transaction costs in connection with a Business Combination, the Sponsor, members of the Company’s founding team or any of their affiliates may, but are not obligated to, loan the Company funds as may be required (“ Working Capital Loans event that a Business Combination does not close, the Company may use a portion of proceeds held outside the Trust Account to repay the Working Capital Loans but no proceeds held in the Trust Account would be used to repay the Working Capital Loans. The Working Capital Loans would either be repaid upon consummation of a Business Combination, without interest, or, at the lenders’ discretion, up to $1,500,000 of such Working Capital Loans may be convertible into warrants of the post-Business Combination entity at a price of $1.50 per warrant. The warrants would be identical to the Private Placement Warrants. On December 30, 2020, the Sponsor agreed to loan the Company up to $300,000 to be used for the payment of costs related to the Initial Public Offering pursuant to a promissory note (the “ Note On January 19, 2022, the Sponsor agreed to loan the Company up to $500,000 to be used for a portion of the expenses of the Company. As of December 31, 2022, an aggregate of $500,000 had been funded under the loan agreement. At the option of the Sponsor, the outstanding principle of $500,000 may be converted into Conversion Warrants equal to the outstanding principle of the note divided by $1.50. Upon funding of the loan, the Company recognized the initial fair value of the Working Capital Loan Option of approximately $7,900 as a debt discount, which is classified as a component of the working capital loan and amortized to interest expense over the expected term of the loan. For the year ended December 31, 2022, the Company amortized approximately $8,000, of the debt discount, classified as interest expense in the accompanying statements of operations. On July 27, 2022, the Sponsor agreed to loan the Company up to $475,000 pursuant to an unsecured, non-interest bearing promissory note (the “ July 2022 Note As of December 31, 2022, the Company had $500,000 in borrowings outstanding under the Working Capital Loans. As of December 31, 2022, the carrying value and the principal value of the loan Administrative Services Agreement Commencing on the effective date of the Registration Statement, the Company agreed to pay an affiliate of the Sponsor a total of $20,000 per month for office space, administrative and support services (including salaries). Upon the Company’s liquidation, the Company will cease paying these monthly fees. Upon completion of the Initial Business Combination, the Company will pay to such affiliate an amount equal to $20,000 multiplied by the number of whole months that have elapsed between the date of the completion of the Initial Business Combination and the closing of the Initial Public Offering. The Company incurred approximately $240,000 and $220,000 in expenses The Sponsor, officers and directors, or any of their respective affiliates, will be reimbursed for any out-of-pocket expenses incurred in connection with activities on the Company’s behalf such as identifying potential target businesses and performing due diligence on suitable business combinations. The audit committee will review on a quarterly basis all payments that were made by us to the Sponsor, directors, officers or the Company’s or any of their respective affiliates. In December 2022, the Company engaged a capital market advisor to assist with the completion of the business combination. The Company agreed to pay the advisor $500,000 in cash and $250,000 paid in equivalent dollar amount in common stock, solely in the event that the Company completes its Business Combination. As of December 31, 2022, the Company determined that a Business Combination is not considered probable. If the fee is determined to be a transaction cost for the Business Combination then the amount payable to the advisor may be accounted for as an expense in the period the liability is recorded.

Commitments & Contingencies (FY

Commitments & Contingencies (FY)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Commitments & Contingencies [Abstract]
Commitments & Contingencies	Note 5-Commitments &Contingencies Registration and Shareholder Rights Agreement The holders of the Founder Shares, Private Placement Warrants and any warrants that may be issued upon conversion of Working Capital Loans (and any Class A ordinary shares issuable upon the exercise of the Private Placement Warrants or warrants issued upon conversion of the Working Capital Loans and upon conversion of the Founder Shares) were entitled to registration rights pursuant to a registration and shareholder rights agreement signed upon the effective date of the Initial Public Offering. The holders of these securities were entitled to make up to three demands, excluding short form demands, that the Company registers such securities. In addition, the holders have certain “piggy-back” registration rights with respect to registration statements filed subsequent to the completion of the initial Business Combination. The Company will bear the expenses incurred in connection with the filing of any such registration statements. Underwriting Agreement The Company granted the underwriters a 45-day option from the date of this prospectus to purchase up to 6,300,000 additional Units at the Initial Public Offering price less the underwriting discounts and commissions. The underwriter exercised its over-allotment option in full on February 9, 2021. The underwriters were entitled to an underwriting discount of $0.20 per unit, or approximately $9.7 million in the aggregate, paid upon the closing of the Initial Public Offering. In addition, $0.35 per unit, or approximately $16.9 million in the aggregate will be payable to the underwriters for deferred underwriting commissions. On April 16, 2023, one of the underwriters waived its entitlement to the payment of any deferred fee, of approximately $10,143,000, to be paid under the terms of the underwriting agreement and is no longer serving in any advisor capacity. As a result, the Company recognized $440,592 of income and $9,702,408 was recorded to additional paid-in capital in relation to the reduction of the deferred underwriter fee. As of September 30, 2023 and December 31, 2022, the deferred underwriting fee payable is $6,762,000 and $16,905,000, respectively. The deferred fee will become payable to the underwriters from the amounts held in the Trust Account solely in the event that the Company completes a Business Combination, subject to the terms of the underwriting agreement. On April 17, 2023, one of the underwriters waived its entitlement to the payment of any deferred fee, of approximately $6,762,000, to be paid under the terms of the underwriting agreement specifically to closing of the Merger Agreement (as defined below) with H2B2 Electrolysis Technologies (“H2B2”). Due to the waiver of the deferred fees being contingent upon the closing of a business combination with H2B2, the deferred underwriting fee remains payable on the unaudited condensed balance sheets until the closing of the business combination with H2B2. Contingent Fee Agreements In December 2022, the Company engaged a capital market advisor to assist with the completion of the Business Combination. The Company agreed to pay the advisor $500,000 in cash and $250,000 paid in equivalent dollar amount in common stock, solely in the event that the Company completes its Business Combination. As of September 30, 2023, the Company determined that a Business Combination is not considered probable. If the fee is determined to be a transaction cost for the Business Combination then the amount payable to the advisor may be accounted for as an expense in the period the liability is recorded. Risks and Uncertainties Management continues to evaluate the impact of the COVID-19 pandemic and has concluded that while it is reasonably possible that the virus could have a negative effect on the Company’s financial position, results of its operations, and/or search for a target company, the specific impact is not readily determinable as of the date of these unaudited condensed financial statements. These unaudited condensed financial statements do not include any adjustments that might result from the outcome of this uncertainty. In February 2022, the Russian Federation and Belarus commenced a military action with the country of Ukraine. As a result of this action, various nations, including the United States, have instituted economic sanctions against the Russian Federation and Belarus. Further, the impact of this action and related sanctions on the world economy are not determinable as of the date of these unaudited condensed financial statements and the specific impact on the Company’s financial condition, results of operations, and cash flows is also not determinable as of the date of these unaudited condensed financial statements. Proposed Business Combination On May 9, 2023, the Company entered into an Agreement and Plan of Merger (the “Merger Agreement”), by and between the Company and H2B2, which provides for, among other things, the deregistration of the Company under the Companies Act (as revised) of the Cayman Islands and the domestication of the Company as a Delaware corporation (the “Domestication”) and, following the Domestication, the merger of H2B2 with and into the Company, with the Company continuing as the surviving corporation (the “Merger” and, together with the Domestication and the other transactions contemplated by the Merger Agreement, the “Transactions”). As a result of the Transactions, H2B2 will cease to exist and the stockholders of H2B2 will become stockholders of the Company. The transactions set forth in the Merger Agreement, including the Domestication and the Merger, will constitute a “Business Combination” as contemplated by the Company’s Amended and Restated Memorandum and Articles of Association. Under the Merger Agreement, the stockholders of H2B2 will receive a number of shares of the domesticated Company’s common stock based on an exchange ratio (the “Exchange Ratio”), the numerator of which is equal to $750 million (which amount will be subject to adjustment in the event that H2B2 issues debt or equity prior to the closing of the Transactions) divided by $10.00, and the denominator of which is equal to the number of outstanding shares of H2B2, including shares that would be issuable upon the exercise in full of all H2B2 options. The holders of H2B2 options will receive the Company’s options equal to the number of shares of H2B2 common stock subject to the H2B2 options multiplied by the Exchange Ratio at an exercise price per share divided by the Exchange Ratio. In connection with the Transactions, the Company, Sponsor, certain of H2B2’s directors and officers and certain former stockholders of H2B2 agreed to enter into lock-up agreements at the closing of the Merger, which will restrict the transfer of (i) a number of shares of the surviving corporation common stock held by such securityholder, as set forth in the lock-up agreement, (ii) any shares of the surviving corporation common stock held issuable upon the exercise or settlement, as applicable, of surviving corporation options held by a securityholder, or (iii) any other securities convertible into or exercisable or exchangeable for surviving corporation common stock held by a securityholder. The lock-up agreements will restrict the transfer until 180 days after the closing of the Merger, subject to limited exceptions and early release provisions set forth under the lock-up agreements. The Merger Agreement contains certain representations and warranties of the parties to the Merger Agreement and consummation of the Transactions is conditioned on approval thereof by the Company’s shareholders and is further conditioned upon, representations and warranties of the parties and other closing conditions. The Merger Agreement may be terminated at any time, but not later than the closing of the Merger, as follows: • by written consent of H2B2 and the Company; • by H2B2 or the Company if any governmental authority has enacted, issued, promulgated, enforced or entered any law or governmental order which has become final and non-appealable and has the effect of making consummation of the transactions contemplated by the Merger Agreement and the Ancillary Agreements (as defined in the Merger Agreement) illegal or otherwise enjoining, preventing or prohibiting the consummation of the transactions contemplated by the Merger Agreement and the Ancillary Agreements (provided that such party did not cause such enactment); • by H2B2 or the Company if the consummation of the Transactions has not occurred on or prior to June 30, 2024, subject to certain automatic extensions, for reasons not primarily due to the terminating party’s breach or violation of the terms of the Merger Agreement; • by H2B2 or the Company if such party disagrees with the final determination of the Closing Date Purchase Price (as defined in the Merger Agreement) by the valuation firm as further described in the Merger Agreement; • by H2B2 if there has been a modification in recommendation of the Company’s board of directors with respect to any of the Proposals (as defined in the Merger Agreement); • by H2B2 if the Company has not obtained shareholder approval for the Transactions by reason of the failure to obtain the required vote at a meeting of the Company’s shareholders; • by H2B2 if (i) prior to completion of a Capital Raise Transaction (as defined in the Merger Agreement), a Capital Raise Investor (as defined in the Merger Agreement) or group of Capital Raise Investors, with legal, valid and binding commitments to fund in such Capital Raise Transaction represent in the aggregate at least the Minimum Investment Amount (as defined in the Merger Agreement) object to the Merger and the other transactions contemplated by the Merger Agreement by delivering a written notice to the board of directors of H2B2 by no later than fifteen days following execution of definitive agreements relating to the Capital Raise Transaction after which time no Capital Raise Investor will be entitled to object to the Merger and the other transactions contemplated by the Merger Agreement; provided that, upon receipt of the written notice described above, H2B2 will be required to terminate the Merger Agreement on the tenth • by H2B2 in the event of an uncured breach of any representation, warranty, covenant or agreement on the part of the Company, except if the breach is curable by the Company through the exercise of its reasonable best efforts, then, for a period of up to thirty • by the Company in the event of an uncured breach of any representation, warranty, covenant or agreement on the part of H2B2, except if the breach is curable by H2B2 through the exercise of its reasonable best efforts, then, for a period of up to thirty • by the Company if the H2B2 stockholder approval has not been obtained; and • by the Company if an H2B2 stockholder exercises any right or takes any action or fails to take any action required to satisfy the conditions or any closing deliverables required to be delivered under the Merger Agreement that prevents consummation of the Merger and the other transactions contemplated by the Merger Agreement and the Ancillary Agreements. At the closing of the Merger, the Company, the Sponsor and certain of H2B2’s stockholders will enter into an Amended and Restated Registration Rights Agreement (the “Registration Rights Agreement”) pursuant to which the Company agreed to file a shelf registration statement with respect to the registrable securities under the Registration Rights Agreement. The Company also agreed to provide customary “piggyback” registration rights. The Registration Rights Agreement also provides that the Company will pay certain expenses relating to such registrations and indemnify the stockholders against certain liabilities. In connection with the execution of the Merger Agreement, the Sponsor and certain other persons have entered into a Support Agreement (the “Sponsor Support Agreement”) with the Company, pursuant to holders of the Company’s Class B ordinary shares have agreed to, among other things, (i) vote at any meeting or pursuant to any action of written resolution of our shareholders all of their Class B ordinary shares held of record or thereafter acquired in favor of the Transactions and (ii) be bound by certain other covenants and agreements related to the Transactions, in each case, on the terms and subject to the conditions set forth in the Sponsor Support Agreement. In connection with the execution of the Merger Agreement, certain stockholders of H2B2 who hold a majority of the outstanding stock of H2B2 have entered into support agreements pursuant to which they will agree to vote in favor of the Transactions at a meeting called to approve the Transactions by H2B2 stockholders (or to act by written consent approving the Transactions). The summaries of the Merger Agreement and the other agreements to be entered into by the parties are qualified in their entirety by reference to the text of the Merger Agreement and agreements entered into in connection therewith. Reimbursable Costs As a condition of the Merger Agreement, H2B2 agreed to reimburse the Company for 50% of the costs incurred as a result of the need to extend the life of the Company to complete a Business Combination if the extension is required for reasons that are not predominantly attributable to the Company or H2B2, up to a maximum of $250,000. The Company determined the reimbursable costs totaled $238,917 as of September 30, 2023. As of September 30, 2023, H2B2 reimbursed the Company in full for a total of $119,458, which is recorded as a reduction in related expenses included in general and administrative expenses on the unaudited condensed statement of operations.	Note 5-Commitments & Contingencies Registration and Shareholder Rights Agreement The holders of the Founder Shares, Private Placement Warrants and any warrants that may be issued upon conversion of Working Capital Loans (and any Class A ordinary shares issuable upon the exercise of the Private Placement Warrants or warrants issued upon conversion of the Working Capital Loans and upon conversion of the Founder Shares) were entitled to registration rights pursuant to a registration and shareholder rights agreement signed upon the effective date of the Initial Public Offering. The holders of these securities were entitled to make up to three demands, excluding short form demands, that the Company registers such securities. In addition, the holders have certain “piggy-back” registration rights with respect to registration statements filed subsequent to the completion of the initial Business Combination. The Company will bear the expenses incurred in connection with the filing of any such registration statements. Underwriting Agreement The Company granted the underwriters a 45-day option from the date of this prospectus to purchase up to 6,300,000 additional Units at the Initial Public Offering price less the underwriting discounts and commissions. The underwriter exercised its over-allotment option in full on February 9, 2021. The underwriters were entitled to an underwriting discount of $0.20 per unit, or approximately $9.7 million in the aggregate, paid upon the closing of the Initial Public Offering. In addition, $0.35 per unit, or approximately $16.9 million in the aggregate will be payable to the underwriters for deferred underwriting commissions. The deferred fee will become payable to the underwriters from the amounts held in the Trust Account solely in the event that the Company completes a Business Combination, subject to the terms of the underwriting agreement. Risks and Uncertainties Management continues to evaluate the impact of COVID-19 and has concluded that while it is reasonably possible that the virus could have a negative effect on the Company’s financial position, results of its operations, and/or search for a target company, the specific impact is not readily determinable as of the date of these financial statements. These financial statements do not include any adjustments that might result from the outcome of this uncertainty. In February 2022, the Russian Federation and Belarus commenced a military action with the country of Ukraine. As a result of this action, various nations, including the United States, have instituted economic sanctions against the Russian Federation and Belarus. Further, the impact of this action and related sanctions on the world economy are not determinable as of the date of these financial statements and the specific impact on the Company’s financial condition, results of operations, and cash flows is also not determinable as of the date of these financial statements.

Class A Ordinary Shares Subje_2

Class A Ordinary Shares Subject to Possible Redemption (FY)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Temporary Equity Disclosure [Abstract]
Class A Ordinary Shares Subject to Possible Redemption	Note 6-Class A Ordinary Shares Subject to Possible Redemption The Company’s Class A ordinary shares feature certain redemption rights that are considered to be outside of the Company’s control and subject to the occurrence of future events. The Company is authorized to issue 500,000,000 Class A ordinary shares with a par value of $0.0001 per share. As of September 30, 2023 and December 31, 2022, there were 635,778 and 48,300,000 Class A ordinary shares issued and outstanding, respectively, which were all subject to possible redemption and are classified outside of permanent equity in the balance sheets. In connection with the extraordinary general meeting held on January 11, 2023, holders of 47,381,598 shares of the Company’s Class A ordinary shares exercised their right to redeem for a redemption value totaling $478,003,632. In connection with the extraordinary general meeting held on August 4, 2023, holders of 282,624 shares of the Company’s Class A ordinary shares exercised their right to redeem for a redemption value totaling $2,942,664. During the nine months ended September 30, 2023, the Company had withdrawn $1,230,308 for working capital purposes. During the year ended December 31, 2022, the Company had withdrawn from the Trust Account $43,317 for working capital purposes. The Class A ordinary shares issued in the Initial Public Offering were recognized in Class A ordinary shares subject to possible redemption as follows: Class A ordinary shares subject to possible redemption at December 31, 2021 ​ ​ $ 483,000,000 Increase in redemption value of Class A ordinary shares subject to possible redeem ​ ​ 4,168,822 Class A ordinary shares subject to possible redemption at December 31, 2022 ​ ​ 487,168,822 Redemptions of Class A ordinary shares ​ ​ (480,946,296) Increase in redemption value of Class A ordinary shares subject to possible redeem ​ ​ 135,254 Class A ordinary shares subject to possible redemption at September 30, 2023 ​ ​ $ 6,357,780	Note 6-Class A Ordinary Shares Subject to Possible Redemption The Company’s Class A ordinary shares feature certain redemption rights that are considered to be outside of the Company’s control and subject to the occurrence of future events. The Company is authorized to issue 500,000,000 Class A ordinary shares with a par value of $0.0001 per share. As of December 31, 2022 and 2021, there were 48,300,000 Class A ordinary shares issued and outstanding, which were all subject to possible redemption and are classified outside of permanent equity in the balance sheets. The Class A ordinary shares issued in the Initial Public Offering were recognized in Class A ordinary shares subject to possible redemption as follows: Gross Proceeds ​ ​ $483,000,000 Less: ​ ​ Offering costs allocated to Class A shares subject to possible redemption ​ ​ (26,406,165) Proceeds allocated to Public Warrants at issuance ​ ​ (12,863,680) Plus: ​ ​ Accrection on Class A ordinary shares subject to possible redemption amount ​ ​ 39,269,845 Class A ordinary shares subject to possible redemption at December 31, 2021 ​ ​ 483,000,000 Increase in redemption value of Class A ordinary shares subject to possible redeem ​ ​ 4,168,822 Class A ordinary shares subject to possible redemption at December 31, 2022 ​ ​ $487,168,822

Shareholders' (Deficit) Equity

Shareholders' (Deficit) Equity (FY)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Shareholders' (Deficit) Equity [Abstract]
Shareholders' (Deficit) Equity	Note 7-Shareholders’ Deficit Preference Shares - The Company is authorized to issue 5,000,000 preference shares with a par value of $0.0001 per share. At September 30, 2023 and December 31, 2022, there were no preference shares issued or outstanding. Class A Ordinary Shares - The Company is authorized to issue 500,000,000 Class A ordinary shares with a par value of $0.0001 per share. Holders of the Company’s Class A ordinary shares are entitled to one vote for each share. At September 30, 2023 and December 31, 2022, there were 635,778 and 48,300,000 shares issued and outstanding, all of which are subject to possible redemption and have been classified as temporary equity (see Note 7). Class B Ordinary Shares - The Company is authorized to issue 50,000,000 Class B ordinary shares with a par value of $0.0001 per share. On February 9, 2021, 10,062,500 Class B ordinary shares were issued and outstanding. On January 30, 2021, the Company effectuated a 5-for-6 Only holders of Class B ordinary shares will have the right to vote on the election of directors prior to the initial Business Combination. Holders of the Class A ordinary shares and holders of the Class B ordinary shares will vote together as a single class on all other matters submitted to a vote of the shareholders, except as required by law. Each ordinary share will have one vote on all such matters. The Class B ordinary shares will automatically convert into Class A ordinary shares at the time of the initial Business Combination, or earlier at the option of the holder, on a one-for-one basis, subject to adjustment for share sub-divisions, share dividends, rights issuances, consolidations, reorganizations, recapitalizations and the like, and subject to further adjustment as provided herein. In the case that additional Class A ordinary shares, or equity-linked securities, are issued or deemed issued in excess of the amounts issued in the Initial Public Offering and related to the closing of the initial Business Combination, the ratio at which the Class B ordinary shares will convert into Class A ordinary shares will be adjusted (unless the holders of a majority of the issued and outstanding Class B ordinary shares agree to waive such anti-dilution adjustment with respect to any such issuance or deemed issuance) so that the number of Class A ordinary shares issuable upon conversion of all Class B ordinary shares will equal, in the aggregate, on an as-converted basis, 20% of the sum of all ordinary shares issued and outstanding upon the completion of the Initial Public Offering plus all Class A ordinary shares and equity-linked securities issued or deemed issued in connection with the initial Business Combination, excluding any shares or equity-linked securities issued, or to be issued, to any seller in the initial Business Combination. In no event will the Class B ordinary shares convert into Class A ordinary shares at a rate of less than one to one.	Note 7-Shareholders’ Equity Preference Shares - The Company is authorized to issue 5,000,000 preference shares with a par value of $0.0001 per share. At December 31, 2022 and 2021, there were no preference shares issued or outstanding. Class A Ordinary Shares - The Company is authorized to issue 500,000,000 Class A ordinary shares with a par value of $0.0001 per share. Holders of the Company’s Class A ordinary shares are entitled to one vote for each share. At December 31, 2022 and 2021, there were 48,300,000 shares issued and outstanding, all of which are subject to possible redemption and have been classified as temporary equity (see Note 7). Class B Ordinary Shares - The Company is authorized to issue 50,000,000 Class B ordinary shares with a par value of $0.0001 per share. On February 9, 2021, 10,062,500 Class B ordinary shares were issued and outstanding. On January 30, 2021, the Company effectuated a 5-for- 6 Only holders of Class B ordinary shares will have the right to vote on the election of directors prior to the initial Business Combination. Holders of the Class A ordinary shares and holders of the Class B ordinary shares will vote together as a single class on all other matters submitted to a vote of the shareholders, except as required by law. Each ordinary share will have one vote on all such matters. The Class B ordinary shares will automatically convert into Class A ordinary shares at the time of the initial business Combination, or earlier at the option of the holder, on a one-for-one basis, subject to adjustment for share sub-divisions, share dividends, rights issuances, consolidations, reorganizations, recapitalizations and the like, and subject to further adjustment as provided herein. In the case that additional Class A ordinary shares, or equity-linked securities, are issued or deemed issued in excess of the amounts issued in the Initial Public Offering and related to the closing of the initial Business Combination, the ratio at which the Class B ordinary shares will convert into Class A ordinary shares will be adjusted (unless the holders of a majority of the issued and outstanding Class B ordinary shares agree to waive such anti-dilution adjustment with respect to any such issuance or deemed issuance) so that the number of Class A ordinary shares issuable upon conversion of all Class B ordinary shares will equal, in the aggregate, on an as-converted basis, 20% of the sum of all ordinary shares issued and outstanding upon the completion of the Initial Public Offering plus all Class A ordinary shares and equity-linked securities issued or deemed issued in connection with the initial Business Combination, excluding any shares or equity-linked securities issued, or to be issued, to any seller in the initial Business Combination. In no event will the Class B ordinary shares convert into Class A ordinary shares at a rate of less than one to one.

Derivative Warrant Liabilitie_2

Derivative Warrant Liabilities (FY)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Derivative Warrant Liabilities [Abstract]
Derivative Warrant Liabilities	Note 8-Derivative Warrant Liabilities As of September 30, 2023 and December 31, 2022, the Company had 9,660,000 and 8,216,330 Public Warrants and Private Placement Warrants, respectively, outstanding. Public Warrants may only be exercised for a whole number of shares. No fractional Public Warrants will be issued upon separation of the Units and only whole Public Warrants will trade. The Public Warrants will become exercisable on the later of (a) 30 days after the completion of a Business Combination or (b) 12 months from the closing of the Initial Public Offering; provided in each case that the Company has an effective registration statement under the Securities Act covering the issuance of the Class A ordinary shares issuable upon exercise of the warrants and a current prospectus relating to them is available and such shares are registered, qualified or exempt from registration under the securities, or blue sky, laws of the state of residence of the holder (or the Company permits holders to exercise their warrants on a cashless basis under the circumstances specified in the warrant agreement). The Company agreed that as soon as practicable, but in no event later than 20 business days after the closing of the initial Business Combination, the Company will use its commercially reasonable efforts to file with the SEC a registration statement covering the issuance of the Class A ordinary shares issuable upon exercise of the warrants, and the Company will use its commercially reasonable efforts to cause the same to become effective within 60 business days after the closing of the initial Business Combination and to maintain the effectiveness of such registration statement and a current prospectus relating to those Class A ordinary shares until the warrants expire or are redeemed; provided that if the Class A ordinary shares are at the time of any exercise of a warrant not listed on a national securities exchange such that they satisfy the definition of a “covered security” under Section 18(b)(1) of the Securities Act, the Company may, at its option, requires holders of Public Warrants who exercise their warrants to do so on a “cashless basis” in accordance with Section 3(a)(9) of the Securities Act and, in the event the Company so elects, it will not be required to file or maintain in effect a registration statement. The warrants have an exercise price of $11.50 per share, subject to adjustments, and will expire five years after the completion of a Business Combination or earlier upon redemption or liquidation. In addition, if (x) the Company issues additional Class A ordinary shares or equity-linked securities for capital raising purposes in connection with the closing of the initial Business Combination at an issue price or effective issue price of less than $9.20 per ordinary share (with such issue price or effective issue price to be determined in good faith by the board of directors and, in the case of any such issuance to the Sponsor or its affiliates, without taking into account any Founder Shares held by the Sponsor or such affiliates, as applicable, prior to such issuance) (the “Newly Issued Price”), (y) the aggregate gross proceeds from such issuances represent more than 60% of the total equity proceeds, and interest thereon, available for the funding of the initial Business Combination on the date of the consummation of the initial Business Combination (net of redemptions), and (z) the volume weighted average trading price of Class A ordinary shares during the 20 trading day period starting on the trading day prior to the day on which the Company consummates its initial Business Combination (such price, the “Market Value”) is below $9.20 per share, the exercise price of the warrants will be adjusted (to the nearest cent) to be equal to 115% of the higher of the Market Value and the Newly Issued Price, the $18.00 per share redemption trigger price described under “Redemption of warrants for cash when the price per Class A ordinary share equals or exceeds $18.00” and “Redemption of warrants for Class A ordinary shares when the price per Class A ordinary share equals or exceeds $10.00” will be adjusted (to the nearest cent) to be equal to 180% of the higher of the Market Value and the Newly Issued Price, and the $10.00 per share redemption trigger price described under the caption “Redemption of warrants when the price per Class A ordinary share equals or exceeds $10.00” will be adjusted (to the nearest cent) to be equal to the higher of the Market Value and the Newly Issued Price. The Private Placement Warrants are identical to the Public Warrants underlying the Units sold in the Initial Public Offering, except that the Private Placement Warrants and the Class A ordinary shares issuable upon exercise of the Private Placement Warrants will not be transferable, assignable or salable until 30 days after the completion of a Business Combination, subject to certain limited exceptions. Additionally, the Private Placement Warrants will be non-redeemable so long as they are held by the initial purchasers or such purchasers’ permitted transferees. If the Private Placement Warrants are held by someone other than the Initial Shareholders or their permitted transferees, the Private Placement Warrants will be redeemable by the Company and exercisable by such holders on the same basis as the Public Warrants. Redemption of warrants for cash when the price per Class A ordinary share equals or exceeds $18.00: Once the warrants become exercisable, the Company may redeem the outstanding warrants (except as described herein with respect to the Private Placement Warrants): • in whole and not in part; • at a price of $0.01 per warrant; • upon not less than 30 days’ prior written notice of redemption to each warrant holder; and • if, and only if, the last reported sale price (the “closing price”) of Class A ordinary shares equals or exceeds $18.00 per share (as adjusted) for any 20 trading days within a 30-trading day period ending on the third trading day prior to the date on which the Company sends the notice of redemption to the warrant holders. The Company will not redeem the warrants as described above unless a registration statement under the Securities Act covering the issuance of the Class A ordinary shares issuable upon exercise of the warrants is then effective and a current prospectus relating to those Class A ordinary shares is available throughout the 30-day redemption period. If and when the warrants become redeemable by the Company, it may exercise its redemption right even if the company is unable to register or qualify the underlying securities for sale under all applicable state securities laws. Redemption of warrants for Class A ordinary shares when the price per Class A ordinary share equals or exceeds $10.00: Once the warrants become exercisable, the Company may redeem the outstanding warrants: • in whole and not in part; • at $0.10 per warrant upon a minimum of 30 days’ prior written notice of redemption provided • if, and only if, the closing price of Class A ordinary shares equals or exceeds $10.00 per Public Share (as adjusted) for any 20 trading days within the 30 - trading day period ending three trading days before the Company sends the notice of redemption to the warrant holders; and • if the closing price of the Class A ordinary shares for any 20 trading days within a 30-trading day period ending on the third trading day prior to the date on which the Company sends the notice of redemption to the warrant holders is less than $18.00 per share (as adjusted), the Private Placement Warrants must also be concurrently called for redemption on the same terms as the outstanding Public Warrants, as described above. The “fair market value” of Class A ordinary shares shall mean the average reported last sale price of Class A ordinary shares for the 10 trading days ending on the third trading day prior to the date on which the notice of redemption is sent to the holders of warrants. In no event will the Company be required to net cash settle any warrant. If the Company is unable to complete a Business Combination within the Combination Period and the Company liquidates the funds held in the Trust Account, holders of warrants will not receive any of such funds with respect to their warrants, nor will they receive any distribution from the Company’s assets held outside of the Trust Account with the respect to such warrants. Accordingly, the warrants may expire worthless.	Note 8-Derivative Warrant Liabilities As of December 31, 2022 and 2021, the Company had 9,660,000 and 8,216,330 Public Warrants and Private Placement Warrants, respectively, outstanding. As of December 31, 2020, the Company did not have any Public Warrants or Private Placement Warrants outstanding. Public Warrants may only be exercised for a whole number of shares. No fractional Public Warrants will be issued upon separation of the Units and only whole Public Warrants will trade. The Public Warrants will become exercisable on the later of (a) 30 days after the completion of a Business Combination or (b) 12 months from the closing of the Initial Public Offering; provided in each case that the Company has an effective registration statement under the Securities Act covering the issuance of the Class A ordinary shares issuable upon exercise of the warrants and a current prospectus relating to them is available and such shares are registered, qualified or exempt from registration under the securities, or blue sky, laws of the state of residence of the holder (or the Company permits holders to exercise their warrants on a cashless basis under the circumstances specified in the warrant agreement). The Company agreed that as soon as practicable, but in no event later than 20 business days after the closing of the initial Business Combination, the Company will use its commercially reasonable efforts to file with the SEC a registration statement covering the issuance of the Class A ordinary shares issuable upon exercise of the warrants, and the Company will use its commercially reasonable efforts to cause the same to become effective within 60 business days after the closing of the initial Business Combination and to maintain the effectiveness of such registration statement and a current prospectus relating to those Class A ordinary shares until the warrants expire or are redeemed; provided that if the Class A ordinary shares are at the time of any exercise of a warrant not listed on a national securities exchange such that they satisfy the definition of a “covered security” under Section 18(b)(1) of the Securities Act, the Company may, at its option, requires holders of Public Warrants who exercise their warrants to do so on a “cashless basis” in accordance with Section 3(a)(9) of the Securities Act and, in the event the Company so elects, it will not be required to file or maintain in effect a registration statement. The warrants have an exercise price of $11.50 per share, subject to adjustments, and will expire five years after the completion of a Business Combination or earlier upon redemption or liquidation. In addition, if (x) the Company The warrants have an exercise price of $11.50 per share, subject to adjustments, and will expire five years after the completion of a Business Combination or earlier upon redemption or liquidation. In addition, if (x) the Company issues additional Class A ordinary shares or equity-linked securities for capital raising purposes in connection with the closing of the initial Business Combination at an issue price or effective issue price of less than $9.20 per ordinary share (with such issue price or effective issue price to be determined in good faith by the board of directors and, in the case of any such issuance to the Sponsor or its affiliates, without taking into account any Founder Shares held by the Sponsor or such affiliates, as applicable, prior to such issuance) (the “ Newly Issued Price Market Value The Private Placement Warrants are identical to the Public Warrants underlying the Units sold in the Initial Public Offering, except that the Private Placement Warrants and the Class A ordinary shares issuable upon exercise of the Private Placement Warrants will not be transferable, assignable or salable until 30 days after the completion of a Business Combination, subject to certain limited exceptions. Additionally, the Private Placement Warrants will be non-redeemable so long as they are held by the initial purchasers or such purchasers’ permitted transferees. If the Private Placement Warrants are held by someone other than the Initial Shareholders or their permitted transferees, the Private Placement Warrants will be redeemable by the Company and exercisable by such holders on the same basis as the Public Warrants. Redemption of warrants for cash when the price per Class A ordinary share equals or exceeds $18.00: Once the warrants become exercisable, the Company may redeem the outstanding warrants (except as described herein with respect to the Private Placement Warrants): • in whole and not in part; • at a price of $0.01 per warrant; • upon not less than 30 days’ prior written notice of redemption to each warrant holder; and • if, and only if, the last reported sale price (the “closing price”) of Class A ordinary shares equals or exceeds $18.00 per share (as adjusted) for any 20 trading days within a 30-trading day period ending on the third trading day prior to the date on which the Company sends the notice of redemption to the warrant holders. The Company will not redeem the warrants as described above unless a registration statement under the Securities Act covering the issuance of the Class A ordinary shares issuable upon exercise of the warrants is then effective and a current prospectus relating to those Class A ordinary shares is available throughout the 30-day redemption period. If and when the warrants become redeemable by the Company, it may exercise its redemption right even if the company is unable to register or qualify the underlying securities for sale under all applicable state securities laws. Redemption of warrants for Class A ordinary shares when the price per Class A ordinary share equals or exceeds $10.00: Once the warrants become exercisable, the Company may redeem the outstanding warrants: • in whole and not in part; • at $0.10 per warrant upon a minimum of 30 days’ prior written notice of redemption provided • if, and only if, the closing price of Class A ordinary shares equals or exceeds $10.00 per Public Share (as adjusted) for any 20 trading days within the 30 - trading day period ending three trading days before the Company sends the notice of redemption to the warrant holders; and • if the closing price of the Class A ordinary shares for any 20 trading days within a 30-trading day period ending on the third trading day prior to the date on which the Company sends the notice of redemption to the warrant holders is less than $18.00 per share (as adjusted), the Private Placement Warrants must also be concurrently called for redemption on the same terms as the outstanding Public Warrants, as described above. The “fair market value” of Class A ordinary shares shall mean the average reported last sale price of Class A ordinary shares for the 10 trading days ending on the third trading day prior to the date on which the notice of redemption is sent to the holders of warrants. In no event will the Company be required to net cash settle any warrant. If the Company is unable to complete a Business Combination within the Combination Period and the Company liquidates the funds held in the Trust Account, holders of warrants will not receive any of such funds with respect to their warrants, nor will they receive any distribution from the Company’s assets held outside of the Trust Account with the respect to such warrants. Accordingly, the warrants may expire worthless.

Fair Value Measurements (FY)

Fair Value Measurements (FY)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Fair Value Measurements	Note 9-Fair Value Measurements At September 30, 2023, cash held in the Trust Account was comprised of $6,655,195 held in a demand deposit account that accrues interest monthly. During the nine months ended September 30, 2023, the Company had withdrawn $1,230,308 for working capital purposes. At December 31, 2022, assets held in the Trust Account was comprised of $487,268,822 held in money market funds which are primarily invested in U.S. Treasury securities. During the year ended December 31, 2022, the Company had withdrawn from the Trust Account $43,317 for working capital purposes. The following table presents information about the Company’s assets and liabilities that are measured at fair value on a recurring basis as of September 30, 2023 and December 31, 2022 and indicates the fair value hierarchy of the valuation techniques that the Company utilized to determine such fair value. September 30, 2023 Description ​ ​ Level 1 ​ ​ Level 2 ​ ​ Level 3 Assets: ​ ​ ​ ​ ​ ​ Cash held in Trust Account ​ ​ $6,655,195 ​ ​ $— ​ ​ $ — Liabilities: ​ ​ ​ ​ ​ ​ Derivative liabilities - Public Warrants ​ ​ $1,255,800 ​ ​ $— ​ ​ $ — Derivative liabilities - Private Warrants ​ ​ $ — ​ ​ $— ​ ​ $1,068,123 December 31, 2022 Description ​ ​ Level 1 ​ ​ Level 2 ​ ​ Level 3 Assets: ​ ​ ​ ​ ​ ​ Investments held in Trust Account - Money Market Funds ​ ​ $487,268,822 ​ ​ $— ​ ​ $ — Liabilities: ​ ​ ​ ​ ​ ​ Derivative liabilities - Public Warrants ​ ​ $ 289,800 ​ ​ $— ​ ​ $ — Derivative liabilities - Private Warrants ​ ​ $ — ​ ​ $— ​ ​ $246,500 There were no other transfers between levels for the period ended September 30, 2023 and December 31, 2022. Level 1 assets include investments in cash, money market funds and U.S. Treasury securities. The Company uses inputs such as actual trade data, benchmark yields, quoted market prices from dealers or brokers, and other similar sources to determine the fair value of its investments. The fair value of the Public Warrants issued in connection with the Initial Public Offering and Private Placement Warrants were initially measured at fair value using a Monte Carlo simulation model and subsequently, the fair value of the Private Placement Warrants have been estimated using a Monte Carlo simulation model each measurement date. For the period ended September 30, 2023 and December 31, 2022, the Company recognized a change to the statement of operations resulting from a increase/decrease in the fair value of liabilities of approximately $1.8 million and $13.8 million, respectively, presented as change in fair value of derivative warrant liabilities on the accompanying statement of operations. The estimated fair value of the Private Placement Warrants, and the Public Warrants prior to being separately listed and traded, is determined using Level 3 inputs. Inherent in a Monte Carlo simulation are assumptions related to expected share-price volatility, expected life, risk-free interest rate and dividend yield. The Company estimates the volatility for its Private Placement Warrants based on the implied volatility from the Company’s traded warrants and from historical volatility of select peer companies ordinary shares that matches the expected remaining life of the warrants. The risk-free interest rate is based on the U.S. Treasury zero-coupon yield curve on the grant date for a maturity similar to the expected remaining life of the warrants. The expected life of the warrants is assumed to be equivalent to their remaining contractual term. The dividend rate is based on the historical rate, which the Company anticipates remaining at zero. The following table provides quantitative information regarding Level 3 fair value measurements inputs at their measurement dates: Private Warrants Private Warrants ​ ​ As of December 31, 2022 ​ ​ As of September 30, 2023 Stock price ​ ​ $10.09 ​ ​ $10.55 Volatility ​ ​ 6.9% ​ ​ 6.7% Expected life of the options to convert ​ ​ 5.47 ​ ​ 0.94 Risk-free rate ​ ​ 4.73% ​ ​ 5.47% Dividend yield ​ ​ — ​ ​ — Working Capital Loan Option ​ ​ December 31, 2022 ​ ​ September 30, 2023 Strike price of debt conversion ​ ​ $1.50 ​ ​ $1.50 Volatility ​ ​ 6.9% ​ ​ 6.7% Expected life of the options to convert ​ ​ 5.47 ​ ​ 5.31 Risk-free rate ​ ​ 4.72% ​ ​ 5.55% Dividend yield ​ ​ — ​ ​ — The change in the level 3 fair value of the derivative warrant liabilities for the period ended September 30, 2023 and December 31, 2022 is summarized as follows: ​ ​ Private Warrants Derivative warrant liabilities at December 31, 2022 ​ ​ $ 246,500 Change in fair value of derivative warrant liabilities ​ ​ 944,868 Derivative warrant liabilities at March 31, 2023 ​ ​ 1,191,368 Change in fair value of derivative warrant liabilities ​ ​ (286,750) Derivative warrant liabilities at June 30, 2023 ​ ​ $ 904,618 Change in fair value of derivative warrant liabilities ​ ​ 163,505 Derivative warrant liabilities at September 30, 2023 ​ ​ $ 1,068,123 Derivative warrant liabilities at December 31, 2021 ​ ​ $ 6,573,100 Change in fair value of derivative warrant liabilities ​ ​ (2,946,400) Derivative warrant liabilities at March 31, 2022 ​ ​ 3,626,700 ​ ​ Private Warrants Change in fair value of derivative warrant liabilities ​ ​ (2,969,400) Derivative warrant liabilities at June 30, 2022 ​ ​ $ 657,300 Change in fair value of derivative warrant liabilities ​ ​ 320,400 Derivative warrant liabilities at September 30, 2022 ​ ​ $ 977,700 The change in the fair value of the Working Capital Loan Option measured with Level 3 inputs for the period ended September 30, 2023 and December 31, 2022 is summarized as follows: Balance at December 31, 2021 ​ ​ $ — Initial fair value of the Working Capital Loan Option ​ ​ 7,885 Change in fair value ​ ​ (7,885) Balance at December 31, 2022 and September 30, 2023 ​ ​ $ —	Note 9-Fair Value Measurements The following table presents information about the Company’s assets and liabilities that are measured at fair value on a recurring basis as of December 31, 2022 and 2021 and indicates the fair value hierarchy of the valuation techniques that the Company utilized to determine such fair value. DECEMBER 31, 2022 Description ​ ​ Level 1 ​ ​ Level 2 ​ ​ Level 3 Assets: ​ ​ ​ ​ ​ ​ Investments held in Trust Account - Money Market Funds ​ ​ $487,268,822 ​ ​ $— ​ ​ $ — Liabilities: ​ ​ ​ ​ ​ ​ Derivative liabilities - Public Warrants ​ ​ $ 289,800 ​ ​ $— ​ ​ $ — Derivative liabilities - Private Warrants ​ ​ $ — ​ ​ $— ​ ​ $246,500 DECEMBER 31, 2021 Description ​ ​ Level 1 ​ ​ Level 2 ​ ​ Level 3 Assets: ​ ​ ​ ​ ​ ​ Investments held in Trust Account - U.S. Treasury Securities ​ ​ $483,012,312 ​ ​ $— ​ ​ $ — Liabilities: ​ ​ ​ ​ ​ ​ Derivative liabilities - Public Warrants ​ ​ $ 7,728,000 ​ ​ $— ​ ​ $ — Derivative liabilities - Private Warrants ​ ​ $ — ​ ​ $— ​ ​ $6,573,100 Transfers to/from Levels 1, 2, and 3 are recognized at the beginning of the reporting period. The estimated fair value of the Public Warrants transferred from a Level 3 measurement to a Level 1 fair value measurement in March 2021, upon trading of the Public Warrants in an active market. There were no other transfers between levels for the years ended December 31, 2022 and 2021. Level 1 assets include investments in money market funds and U.S. Treasury securities. The Company uses inputs such as actual trade data, benchmark yields, quoted market prices from dealers or brokers, and other similar sources to determine the fair value of its investments. The fair value of the Public Warrants issued in connection with the Public Offering and Private Placement Warrants were initially measured at fair value using a Monte Carlo simulation model and subsequently, the fair value of the Private Placement Warrants have been estimated using a Monte Carlo simulation model each measurement date. For the years ended December 31, 2022 and 2021, the Company recognized a change to the statement of operations resulting from a decrease in the fair value of liabilities of approximately $13.8 million and $9.5 million, respectively, presented as change in fair value of derivative warrant liabilities on the accompanying statement of operations. The estimated fair value of the Private Placement Warrants, and the Public Warrants prior to being separately listed and traded, is determined using Level 3 inputs. Inherent in a Monte Carlo simulation are assumptions related to expected share-price volatility, expected life, risk-free interest rate and dividend yield. The Company estimates the volatility for its Private Placement Warrants based on the implied volatility from the Company’s traded warrants and from historical volatility of select peer companies ordinary shares that matches the expected remaining life of the warrants. The risk-free interest rate is based on the U.S. Treasury zero-coupon yield curve on the grant date for a maturity similar to the expected remaining life of the warrants. The expected life of the warrants is assumed to be equivalent to their remaining contractual term. The dividend rate is based on the historical rate, which the Company anticipates remaining at zero. The following table provides quantitative information regarding Level 3 fair value measurements inputs at their measurement dates: Private Warrants Private Warrants ​ ​ As of December 31, 2022 ​ ​ As of December 31, 2021 Stock price ​ ​ $10.09 ​ ​ $9.77 Volatility ​ ​ 6.9% ​ ​ 15.3% Expected life of the options to convert ​ ​ 5.47 ​ ​ 5.60 Risk-free rate ​ ​ 4.73% ​ ​ 1.32% Dividend yield ​ ​ — ​ ​ — Working Capital Loan Option ​ ​ December 31, 2022 Strike price of debt conversion ​ ​ $1.50 Volatility ​ ​ 6.9% Expected life of the options to convert ​ ​ 5.47 Risk-free rate ​ ​ 4.72% Dividend yield ​ ​ — The change in the level 3 fair value of the derivative warrant liabilities for the years ended December 31, 2022 and 2021 is summarized as follows: ​ ​ Public Warrants ​ ​ Private Warrants ​ ​ Total Derivative warrant liabilities at December 31, 2020 ​ ​ $ — ​ ​ $ — ​ ​ $ — Issuance of Public and Private Warrants ​ ​ 12,863,680 ​ ​ 10,941,230 ​ ​ 23,804,910 Transfer of Public Warrants to Level 1 ​ ​ (13,524,000) ​ ​ — ​ ​ (13,524,000) Change in fair value of derivative warrant liabilities ​ ​ 660,320 ​ ​ (4,368,130) ​ ​ (3,707,810) Derivative warrant liabilities at December 31, 2021 ​ ​ — ​ ​ 6,573,100 ​ ​ 6,573,100 Change in fair value of derivative ​ ​ — ​ ​ (6,326,600) ​ ​ (6,326,600) Derivative warrant liabilities at December 31, 2022 ​ ​ $ — ​ ​ $ 246,500 ​ ​ $ 246,500 The change in the fair value of the Working Capital Loan Option measured with Level 3 inputs for the year ended December 31, 2022 is summarized as follows: Balance at December 31, 2021 ​ ​ $ — Initial fair value of the Working Capital Loan Option ​ ​ 7,885 Change in fair value ​ ​ (7,885) Balance at December 31, 2022 ​ ​ $ —

Subsequent Events (FY)

Subsequent Events (FY)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Subsequent Events [Abstract]
Subsequent Events	Note 10-Subsequent Events The Company evaluated subsequent events and transactions that occurred up to the date unaudited condensed financial statements were available to be issued. Based upon this review, the Company determined that there have been no events that have occurred that would require adjustments to the disclosures in the unaudited condensed financial statements, other than as described below. Amendment to the Merger Agreement On December 15, 2023, RMG III and H2B2 entered into the Merger Agreement Amendment. The Merger Agreement Amendment, amended certain terms of the Existing Merger Agreement to reflect the following amendments, among others: • Base Purchase Price. • Closing Date Purchase Price. • AVR Option Amount. • Minimum Investment Amount. • 10% Premium. • Minimum Net Tangible Assets Condition. • Conversion of RMG III Class B Ordinary Shares. • Warrant Amendment. • Director Nominees. The Business Combination would be consummated in accordance with the terms and subject to the conditions as further described in the Merger Agreement Amendment as filed with the SEC on a Current Report on Form 8-K on December 18, 2023. Other than as expressly modified by the Merger Agreement Amendment, the Merger Agreement, which was filed as Exhibit 2.1 to the Current Report on Form 8-K filed by the Company with the SEC on May 11, 2023, remains in full force and effect.	Note 10-Subsequent Events The Company evaluated subsequent events and transactions that occurred up to the date financial statements were available to be issued. Based upon this review, the Company determined that, except as disclosed below, there have been no events that have occurred that would require adjustments to the disclosures in the financial statements, except as disclosed below. On January 4, 2023, the Company entered into a non-binding letter of intent (“ LOI H2B2 Target energy systems, services, and equipment. Under the terms of the LOI, the Company and H2B2 would be become a combined entity, with H2B2’s existing equity holders continuing to hold substantially all of their equity in the combined public company. We expect to announce additional details regarding the proposed business combination when a definitive merger agreement is executed, which is expected in the first half of 2023. On January 11, 2023, the Company held an extraordinary general meeting of shareholders for the purpose of approving an amendment to the amended and restated memorandum and articles of association to extend the date by which the Company must complete a business combination from February 9, 2023, to May 9, 2023 (the “ Extended Date First Extension In connection with the First Extension, a total of 260 shareholders elected to redeem an aggregate of 47,381,598 Class A ordinary shares, representing approximately 98.10% of our issued and outstanding Class A ordinary shares, for an aggregate of approximately $478,003,632 in cash. Subsequent to the redemption, 918,402 Class A ordinary shares remained outstanding. In March 2023, the Company borrowed $250,000 under the July 2022 Note.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Q3) (Policies)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Summary of Significant Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed financial statements of the Company are presented in U.S. dollars and have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information and Article 10 of Regulation S-X. Accordingly, certain disclosures included in the annual financial statements have been condensed or omitted from these financial statements as they are not required for interim financial statements under GAAP and the rules of the SEC. In the opinion of management, the unaudited condensed financial statements reflect all adjustments, which include only normal recurring adjustments necessary for the fair statement of the balances and results for the periods presented. Operating results for the three and nine months ended September 30, 2023 are not necessarily indicative of the results that may be expected for the year ended December 31, 2023. The accompanying unaudited condensed financial statements should be read in conjunction with the audited financial statements and notes thereto included in the Annual Report on Form 10-K filed by the Company with the SEC on April 18, 2023.	Basis of Presentation The accompanying financial statements are presented in U.S. dollars in conformity with accounting principles generally accepted in the United States of America (“ GAAP
Emerging Growth Company	Emerging Growth Company The Company is an “emerging growth company,” as defined in Section 2(a) of the Securities Act, as modified by the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”), and it may take advantage of certain exemptions from various reporting requirements that are applicable to other public companies that are not emerging growth companies including, but not limited to, not being required to comply with the independent registered public accounting firm attestation requirements of Section 404 of the Sarbanes-Oxley Act, reduced disclosure obligations regarding executive compensation in its periodic reports and proxy statements, and exemptions from the requirements of holding a nonbinding advisory vote on executive compensation and shareholder approval of any golden parachute payments not previously approved. Further, Section 102(b)(1) of the JOBS Act exempts emerging growth companies from being required to comply with new or revised financial accounting standards until private companies (that is, those that have not had a Securities Act registration statement declared effective or do not have a class of securities registered under the Exchange Act) are required to comply with the new or revised financial accounting standards. The JOBS Act provides that an emerging growth company can elect to opt out of the extended transition period and comply with the requirements that apply to non-emerging growth companies but any such an election to opt out is irrevocable. The Company has elected not to opt out of such extended transition period, which means that when a standard is issued or revised and it has different application dates for public or private companies, the Company, as an emerging growth company, can adopt the new or revised standard at the time private companies adopt the new or revised standard. This may make comparison of the Company’s financial statement with another public company that is neither an emerging growth company nor an emerging growth company that has opted out of using the extended transition period difficult or impossible because of the potential differences in accounting standards used.	Emerging Growth Company The Company is an “emerging growth company,” as defined in Section 2(a) of the Securities Act, as modified by the Jumpstart Our Business Startups Act of 2012 (the “ JOBS Act Further, Section 102(b)(1) of the JOBS Act exempts emerging growth companies from being required to comply with new or revised financial accounting standards until private companies (that is, those that have not had a Securities Act registration statement declared effective or do not have a class of securities registered under the Exchange Act) are required to comply with the new or revised financial accounting standards. The JOBS Act provides that an emerging growth company can elect to opt out of the extended transition period and comply with the requirements that apply to non-emerging growth companies but any such an election to opt out is irrevocable. The Company has elected not to opt out of such extended transition period, which means that when a standard is issued or revised and it has different application dates for public or private companies, the Company, as an emerging growth company, can adopt the new or revised standard at the time private companies adopt the new or revised standard. This may make comparison of the Company’s financial statement with another public company that is neither an emerging growth company nor an emerging growth company that has opted out of using the extended transition period difficult or impossible because of the potential differences in accounting standards used.
Concentration of Credit Risk	Concentration of Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist of cash accounts in a financial institution, which, at times, may exceed the Federal Depository Insurance Coverage limit of $250,000. As of September 30, 2023 and December 31, 2022, the Company has not experienced losses on these accounts and management believes the Company is not exposed to significant risks on such accounts.	Concentration of Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist of cash accounts in a financial institution, which, at times, may exceed the Federal Depository Insurance Coverage limit of $250,000. As of December 31, 2022 and 2021, the Company has not experienced losses on these accounts and management believes the Company is not exposed to significant risks on such accounts.
Cash and Cash Equivalents	Cash and Cash Equivalents The Company considers all short-term investments with an original maturity of three months or less when purchased to be cash equivalents. The Company had no cash equivalents as of September 30, 2023 and December 31, 2022.	Cash and Cash Equivalents The Company considers all short-term investments with an original maturity of three months or less when purchased to be cash equivalents. The Company had no cash equivalents as of December 31, 2022 and 2021.
Cash and Investments Held in Trust Account	Cash and Investments Held in Trust Account The Company’s portfolio of investments is comprised of cash and U.S. government securities, within the meaning set forth in Section 2(a)(16) of the Investment Company Act, with a maturity of 185 days or less, or investments in money market funds that invest in U.S. government securities and generally have a readily determinable fair value, or a combination thereof. Cash held in the Trust Account is in a demand deposit account that accrues interest monthly. When the Company’s investments held in the Trust Account are comprised of U.S. government securities, the investments are classified as trading securities. When the Company’s investments held in the Trust Account are comprised of money market funds, the investments are recognized at fair value. Trading securities and investments in money market funds are presented on the balance sheets at fair value at the end of each reporting period. Gains and losses resulting from the change in fair value of these securities is included in unrealized gain on investments held in Trust Account in the accompanying statements of operations. The estimated fair values of investments held in the Trust Account are determined using available market information, other than for investments in open-ended money market funds with published daily net asset values (“NAV”), in which case the Company uses NAV as a practical expedient to fair value. The NAV on these investments is typically held constant at $1.00 per unit. The Trust Account may also contain balances of cash as result of investment activity.	Investments Held in Trust Account The Company’s portfolio of investments is comprised of U.S. government securities, within the meaning set forth in Section 2(a)(16) of the Investment Company Act, with a maturity of 185 days or less, or investments in money market funds that invest in U.S. government securities and generally have a readily determinable fair value, or a combination thereof. When the Company’s investments held in the Trust Account are comprised of U.S. government securities, the investments are classified as trading securities. When the Company’s investments held in the Trust Account are comprised of money market funds, the investments are recognized at fair value. Trading securities and investments in money market funds are presented on the balance sheets at fair value at the end of each reporting period. Gains and losses resulting from the change in fair value of these securities is included in unrealized gain on investments held in Trust Account in the accompanying statements of operations. The estimated fair values of investments held in the Trust Account are determined using available market information, other than for investments in open-ended money market funds with published daily net asset values (“ NAV
Use of Estimates	Use of Estimates The preparation of unaudited condensed financial statements in conformity with U.S. GAAP requires the Company’s management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statement. Making estimates requires management to exercise significant judgment. It is at least reasonably possible that the estimate of the effect of a condition, situation or set of circumstances that existed at the date of the financial statement, which management considered in formulating its estimate, could change in the near term due to one or more future confirming events. Accordingly, the actual results could differ significantly from those estimates.	Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires the Company’s management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statement. Making estimates requires management to exercise significant judgment. It is at least reasonably possible that the estimate of the effect of a condition, situation or set of circumstances that existed at the date of the financial statement, which management considered in formulating its estimate, could change in the near term due to one or more future confirming events. Accordingly, the actual results could differ significantly from those estimates.
Fair Value of Financial Instruments	Fair Value of Financial Instruments The fair value of the Company’s assets and liabilities, which qualify as financial instruments under the FASB ASC Topic 820, “Fair Value Measurements,” approximates the carrying amounts represented in the balance sheet.	Fair Value of Financial Instruments The fair value of the Company’s assets and liabilities, which qualify as financial instruments under the FASB ASC Topic 820, “Fair Value Measurements,” approximates the carrying amounts represented in the balance sheet.
Fair Value Measurements	Fair Value Measurements Fair value is defined as the price that would be received for sale of an asset or paid for transfer of a liability, in an orderly transaction between market participants at the measurement date. GAAP establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). These tiers include: • Level 1, defined as observable inputs such as quoted prices for identical instruments in active markets; • Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable such as quoted prices for similar instruments in active markets or quoted prices for identical or similar instruments in markets that are not active; and • Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions, such as valuations derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable. In some circumstances, the inputs used to measure fair value might be categorized within different levels of the fair value hierarchy. In those instances, the fair value measurement is categorized in its entirety in the fair value hierarchy based on the lowest level input that is significant to the fair value measurement.	Fair Value Measurements Fair value is defined as the price that would be received for sale of an asset or paid for transfer of a liability, in an orderly transaction between market participants at the measurement date. GAAP establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). These tiers include: • Level 1, defined as observable inputs such as quoted prices for identical instruments in active markets; • Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable such as quoted prices for similar instruments in active markets or quoted prices for identical or similar instruments in markets that are not active; and • Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions, such as valuations derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable. In some circumstances, the inputs used to measure fair value might be categorized within different levels of the fair value hierarchy. In those instances, the fair value measurement is categorized in its entirety in the fair value hierarchy based on the lowest level input that is significant to the fair value measurement.
Working Capital Loan Option	Working Capital Loan Option On January 19, 2022, the Sponsor agreed to loan the Company up to $500,000 to be used for a portion of the expenses of the Company. On July 27, 2022, the Sponsor agreed to loan the Company up to $475,000. The notes are due upon consummation of our Business Combination, without interest. At the option of the Sponsor, the outstanding principle of the notes may be converted into that number of warrants (“Conversion Warrants”) equal to the outstanding principle of the note divided by $1.50. The option (“Working Capital Loan Option”) to convert the working capital loans into warrants qualifies as an embedded derivative under ASC 815 and is required to be recognized at fair value with subsequent changes in fair value recognized in Company’s statements of operations each reporting period until the loan is repaid or converted. As of September 30, 2023 and December 31, 2022, the fair value of the Working Capital Loan Option was $0, and the Working Capital Loan is held at cost of $850,000 and $500,000, respectively, see Note 9.	Working Capital Loan Option On January 19, 2022, the Sponsor agreed to loan the Company up to $500,000 to be used for a portion of the expenses of the Company. The note is due upon consummation of our Business Combination, without interest. At the option of the Sponsor, the outstanding principle of $500,000 may be converted into that number of warrants (“ Conversion Warrants Working Capital Loan Option under ASC 815 and is required to be recognized at fair value with subsequent changes in fair value recognized in Company’s statements of operations each reporting period until the loan is repaid or converted. As of December 31, 2022, the fair value of the Working Capital Loan Option was $500,000, see Note 9.
Derivative Warrant Liabilities	Derivative Warrant Liabilities The Company does not use derivative instruments to hedge exposures to cash flow, market, or foreign currency risks. The Company evaluates all of its financial instruments, including issued share purchase warrants, to determine if such instruments are derivatives or contain features that qualify as embedded derivatives, pursuant to FASB ASC Topic 480 and ASC Topic 815, “Derivatives and Hedging” (“ASC 815”). The classification of derivative instruments, including whether such instruments should be recorded as liabilities or as equity, is re-assessed at the end of each reporting period. The warrants issued in the Initial Public Offering (the “Public Warrants”) and the Private Placement Warrants are recognized as derivative liabilities in accordance with ASC 815. Accordingly, the Company recognizes the warrant instruments as liabilities at fair value and adjust the instruments to fair value at each reporting period. The liabilities are subject to remeasurement at each balance sheet date until exercised, and any change in fair value is recognized in the Company’s statement of operations. The fair value of warrants issued in connection with the Initial Public Offering and Private Placement were initially measured at fair value using a Monte Carlo simulation model and subsequently, the fair value of the Private Placement warrants have been estimated using a Monte Carlo simulation model each measurement date. The fair value of Warrants issued in connection with our Initial Public Offering have subsequently been measured based on the listed market price of such warrants.	Derivative Warrant Liabilities The Company does not use derivative instruments to hedge exposures to cash flow, market, or foreign currency risks. The Company evaluates all of its financial instruments, including issued share purchase warrants, to determine if such instruments are derivatives or contain features that qualify as embedded derivatives, pursuant to FASB ASC Topic 480 and ASC Topic 815, “Derivatives and Hedging” (“ ASC 815 The warrants issued in the Initial Public Offering (the “ Public Warrants
Offering Costs Associated with the Initial Public Offering	Offering Costs Associated with the Initial Public Offering Offering costs consisted of legal, accounting, underwriting and other costs incurred in connection with the Initial Public Offering that were directly related to the Initial Public Offering. Offering costs were allocated to the separable financial instruments issued in the Initial Public Offering based on a relative fair value basis, compared to total proceeds received. Offering costs associated with derivative warrant liabilities were expensed as incurred and presented as non-operating expenses in the statements of operations. Offering costs associated with the issuance of the Class A ordinary shares were charged against the carrying value of the Class A ordinary shares subject to possible redemption upon the completion of the Initial Public Offering. The Company classifies deferred underwriting commissions as non-current liabilities as their liquidation is not reasonably expected to require the use of current assets or require the creation of current liabilities.	Offering Costs Associated with the Initial Public Offering Offering costs consisted of legal, accounting, underwriting and other costs incurred in connection with the Initial Public Offering that were directly related to the Initial Public Offering. Offering costs were allocated to the separable financial instruments issued in the Initial Public Offering based on a relative fair value basis, compared to total proceeds received. Offering costs associated with derivative warrant liabilities were expensed as incurred and presented as non-operating expenses in the statements of operations. Offering costs associated with the issuance of the Class A ordinary shares were charged against the carrying value of the Class A ordinary shares subject to possible redemption upon the completion of the Initial Public Offering. The Company classifies deferred underwriting commissions as non-current liabilities as their liquidation is not reasonably expected to require the use of current assets or require the creation of current liabilities.
Class A Ordinary Shares Subject to Possible Redemption	Class A Ordinary Shares Subject to Possible Redemption The Company accounts for its Class A ordinary shares subject to possible redemption in accordance with ASC 480. Class A ordinary shares subject to mandatory redemption (if any) are classified as liability instruments and are measured at fair value. Conditionally redeemable Class A ordinary shares (including Class A ordinary shares that feature redemption rights that are either within the control of the holder or subject to redemption upon the occurrence of uncertain events not solely within the Company’s control) are classified as temporary equity. At all other times, Class A ordinary shares are classified as shareholders’ equity. The Company’s Class A ordinary shares feature certain redemption rights that are considered to be outside of the Company’s control and subject to the occurrence of uncertain future events. Accordingly, as of September 30, 2023 and December 31, 2022, 635,778 and 48,300,000 Class A ordinary shares subject to possible redemption, respectively, are presented at redemption value as temporary equity, outside of the shareholders’ equity section of the Company’s balance sheet. Effective with the closing of the Initial Public Offering, the Company recognized the accretion from initial book value to redemption amount, which resulted in charges against additional paid-in capital (to the extent available) and accumulated deficit.	Class A Ordinary Shares Subject to Possible Redemption The Company accounts for its Class A ordinary shares subject to possible redemption in accordance with ASC 480. Class A ordinary shares subject to mandatory redemption (if any) are classified as liability instruments and are measured at fair value. Conditionally redeemable Class A ordinary shares (including Class A ordinary shares that feature redemption rights that are either within the control of the holder or subject to redemption upon the occurrence of uncertain events not solely within the Company’s control) are classified as temporary equity. At all other times, Class A ordinary shares are classified as shareholders’ equity. The Company’s Class A ordinary shares feature certain redemption rights that are considered to be outside of the Company’s control and subject to the occurrence of uncertain future events. Accordingly, as of December 31, 2022 and 2021, 48,300,000 Class A ordinary shares subject to possible redemption are presented at redemption value as temporary equity, outside of the shareholders’ equity section of the Company’s balance sheet. Effective with the closing of the Initial Public Offering, the Company recognized the accretion from initial book value to redemption amount, which resulted in charges against additional paid-in capital (to the extent available) and accumulated deficit.
Income Taxes	Income Taxes The Company complies with the accounting and reporting requirements of ASC Topic 740, “Income Taxes” (“ASC 740”), which requires an asset and liability approach to financial accounting and reporting for income taxes. Deferred income tax assets and liabilities are computed for differences between the financial statement and tax bases of assets and liabilities that will result in future taxable or deductible amounts, based on enacted tax laws and rates applicable to the periods in which the differences are expected to affect taxable income. Valuation allowances are established, when necessary, to reduce deferred tax assets to the amount expected to be realized. ASC 740 prescribes a recognition threshold and a measurement attribute for the financial statement recognition and measurement of tax positions taken or expected to be taken in a tax return. For those benefits to be recognized, a tax position must be more-likely-than-not to be sustained upon examination by taxing authorities. The Company’s management determined that the Cayman Islands is the Company’s only major tax jurisdiction. The Company recognizes accrued interest and penalties related to unrecognized tax benefits as income tax expense. There were no unrecognized tax benefits and no amounts accrued for interest and penalties as of September 30, 2023. The Company is currently not aware of any issues under review that could result in significant payments, accruals or material deviation from its position. There is currently no taxation imposed on income by the Government of the Cayman Islands. In accordance with Cayman federal income tax regulations, income taxes are not levied on the Company. Consequently, income taxes are not reflected in the Company’s financial statement. The Company’s management does not expect that the total amount of unrecognized tax benefits will materially change over the next twelve months.	Income Taxes The Company complies with the accounting and reporting requirements of ASC Topic 740, “Income Taxes” (“ ASC 740 tax bases of assets and liabilities that will result in future taxable or deductible amounts, based on enacted tax laws and rates applicable to the periods in which the differences are expected to affect taxable income. Valuation allowances are established, when necessary, to reduce deferred tax assets to the amount expected to be realized. ASC 740 prescribes a recognition threshold and a measurement attribute for the financial statement recognition and measurement of tax positions taken or expected to be taken in a tax return. For those benefits to be recognized, a tax position must be more-likely-than-not to be sustained upon examination by taxing authorities. The Company’s management determined that the Cayman Islands is the Company’s only major tax jurisdiction. The Company recognizes accrued interest and penalties related to unrecognized tax benefits as income tax expense. There were no unrecognized tax benefits and no amounts accrued for interest and penalties as of December 31, 2022 and 2021. The Company is currently not aware of any issues under review that could result in significant payments, accruals or material deviation from its position. There is currently no taxation imposed on income by the Government of the Cayman Islands. In accordance with Cayman federal income tax regulations, income taxes are not levied on the Company. Consequently, income taxes are not reflected in the Company’s financial statement. The Company’s management does not expect that the total amount of unrecognized tax benefits will materially change over the next twelve months.
Net Income (Loss) Per Ordinary Share	Net (Loss) Income Per Ordinary Share The Company has two classes of shares issued and outstanding: Class A ordinary shares and Class B ordinary shares. Income and losses are shared pro rata between the two classes of shares. Net (loss) income per ordinary share is computed by dividing net (loss) income by the weighted-average number of ordinary shares outstanding during the periods. The Company has not considered the effect of the warrants sold in the Initial Public Offering and the Private Placement to purchase an aggregate of 17,876,330, of the Company’s Class A ordinary shares in the calculation of diluted net (loss) income per share, because their exercise is contingent upon future events and their inclusion would be anti-dilutive under the treasury stock method. As a result, diluted net (loss) income per share is the same as basic net (loss) income per share for the three and nine months ended September 30, 2023 and 2022. Accretion associated with the Class A ordinary shares subject to possible redemption is excluded from earnings per share, as the redemption value approximates fair value. The following table presents a reconciliation of the numerator and denominator used to compute basic and diluted net (loss) income per share for each ordinary share class. ​ ​ For the Three Months Ended September 30, ​ ​ For the Nine Months Ended September 30, ​ ​ 2023 ​ ​ 2022 ​ ​ 2023 ​ ​ 2022 ​ ​ Class A ​ ​ Class B ​ ​ Class A ​ ​ Class B ​ ​ Class A ​ ​ Class B ​ ​ Class A ​ ​ Class B Basic and diluted net (loss) income per common share: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Numerator: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allocation of net (loss) income ​ ​ $(101,278) ​ ​ $ (1,645,286) ​ ​ $ 949,460 ​ ​ $ 237,365 ​ ​ $(1,450,300) ​ ​ $ (6,325,489) ​ $10,917,529 ​ ​ $ 2,729,382 Denominator: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Basic and diluted weighted average common shares outstanding ​ ​ 743,298 ​ ​ 12,075,000 ​ ​ 48,300,000 ​ ​ 12,075,000 ​ ​ 2,768,541 ​ ​ 12,075,000 ​ ​ 48,300,000 ​ ​ 12,075,000 Basic and diluted net (loss) income per common share ​ ​ $ (0.14) ​ ​ $ (0.14) ​ ​ $ 0.02 ​ ​ $ 0.02 ​ ​ $ (0.52) ​ ​ $ (0.52) ​ ​ $ 0.23 ​ ​ $ 0.23	Net Income per Ordinary Share The Company has two classes of shares issued and outstanding: Class A ordinary shares and Class B ordinary shares. Income and losses are shared pro rata between the two classes of shares. Net income per ordinary share is computed by dividing net income by the weighted-average number of ordinary shares outstanding during the periods. The Company has not considered the effect of the warrants sold in the Initial Public Offering and the Private Placement to purchase an aggregate of 17,876,330, of the Company’s Class A ordinary shares in the calculation of diluted net income per share, because their exercise is contingent upon future events and their exercise is contingent upon future events. As a result, diluted net income per share is the same as basic net income per share for the years ended December 31, 2022 and 2021. Accretion associated with the Class A ordinary shares subject to possible redemption is excluded from earnings per share, as the redemption value approximates fair value. The following table presents a reconciliation of the numerator and denominator used to compute basic and diluted net income per share for each ordinary share class: ​ ​ For the Year Ended December 31, 2022 ​ ​ For the Year Ended December 31, 2021 ​ ​ Class A ​ ​ Class B ​ ​ Class A ​ ​ Class B Basic and diluted net income per common share: ​ ​ ​ ​ ​ ​ ​ ​ Numerator: ​ ​ ​ ​ ​ ​ ​ ​ Allocation of net income (loss) ​ ​ $12,700,862 ​ ​ $ 3,175,215 ​ ​ $ 5,468,324 ​ ​ $ 1,509,295 Denominator: ​ ​ ​ ​ ​ ​ ​ ​ Basic and diluted weighted average common shares outstanding ​ ​ 48,300,000 ​ ​ 12,075,000 ​ ​ 43,139,178 ​ ​ 11,906,712 Basic and diluted net income per common share ​ ​ $ 0.26 ​ ​ $ 0.26 ​ ​ $ 0.13 ​ ​ $ 0.13
Recent Accounting Pronouncements	Recent Accounting Pronouncements The Company’s management does not believe there are any recently issued, but not yet effective, accounting pronouncements if currently adopted would have a material effect on the Company’s unaudited condensed financial statements.	Recent Accounting Pronouncements The Company’s management does not believe there are any recently issued, but not yet effective, accounting pronouncements if currently adopted would have a material effect on the Company’s financial statements.

Summary of Significant Accoun_4

Summary of Significant Accounting Policies (FY) (Policies)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Summary of Significant Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed financial statements of the Company are presented in U.S. dollars and have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information and Article 10 of Regulation S-X. Accordingly, certain disclosures included in the annual financial statements have been condensed or omitted from these financial statements as they are not required for interim financial statements under GAAP and the rules of the SEC. In the opinion of management, the unaudited condensed financial statements reflect all adjustments, which include only normal recurring adjustments necessary for the fair statement of the balances and results for the periods presented. Operating results for the three and nine months ended September 30, 2023 are not necessarily indicative of the results that may be expected for the year ended December 31, 2023. The accompanying unaudited condensed financial statements should be read in conjunction with the audited financial statements and notes thereto included in the Annual Report on Form 10-K filed by the Company with the SEC on April 18, 2023.	Basis of Presentation The accompanying financial statements are presented in U.S. dollars in conformity with accounting principles generally accepted in the United States of America (“ GAAP
Emerging Growth Company	Emerging Growth Company The Company is an “emerging growth company,” as defined in Section 2(a) of the Securities Act, as modified by the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”), and it may take advantage of certain exemptions from various reporting requirements that are applicable to other public companies that are not emerging growth companies including, but not limited to, not being required to comply with the independent registered public accounting firm attestation requirements of Section 404 of the Sarbanes-Oxley Act, reduced disclosure obligations regarding executive compensation in its periodic reports and proxy statements, and exemptions from the requirements of holding a nonbinding advisory vote on executive compensation and shareholder approval of any golden parachute payments not previously approved. Further, Section 102(b)(1) of the JOBS Act exempts emerging growth companies from being required to comply with new or revised financial accounting standards until private companies (that is, those that have not had a Securities Act registration statement declared effective or do not have a class of securities registered under the Exchange Act) are required to comply with the new or revised financial accounting standards. The JOBS Act provides that an emerging growth company can elect to opt out of the extended transition period and comply with the requirements that apply to non-emerging growth companies but any such an election to opt out is irrevocable. The Company has elected not to opt out of such extended transition period, which means that when a standard is issued or revised and it has different application dates for public or private companies, the Company, as an emerging growth company, can adopt the new or revised standard at the time private companies adopt the new or revised standard. This may make comparison of the Company’s financial statement with another public company that is neither an emerging growth company nor an emerging growth company that has opted out of using the extended transition period difficult or impossible because of the potential differences in accounting standards used.	Emerging Growth Company The Company is an “emerging growth company,” as defined in Section 2(a) of the Securities Act, as modified by the Jumpstart Our Business Startups Act of 2012 (the “ JOBS Act Further, Section 102(b)(1) of the JOBS Act exempts emerging growth companies from being required to comply with new or revised financial accounting standards until private companies (that is, those that have not had a Securities Act registration statement declared effective or do not have a class of securities registered under the Exchange Act) are required to comply with the new or revised financial accounting standards. The JOBS Act provides that an emerging growth company can elect to opt out of the extended transition period and comply with the requirements that apply to non-emerging growth companies but any such an election to opt out is irrevocable. The Company has elected not to opt out of such extended transition period, which means that when a standard is issued or revised and it has different application dates for public or private companies, the Company, as an emerging growth company, can adopt the new or revised standard at the time private companies adopt the new or revised standard. This may make comparison of the Company’s financial statement with another public company that is neither an emerging growth company nor an emerging growth company that has opted out of using the extended transition period difficult or impossible because of the potential differences in accounting standards used.
Concentration of Credit Risk	Concentration of Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist of cash accounts in a financial institution, which, at times, may exceed the Federal Depository Insurance Coverage limit of $250,000. As of September 30, 2023 and December 31, 2022, the Company has not experienced losses on these accounts and management believes the Company is not exposed to significant risks on such accounts.	Concentration of Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist of cash accounts in a financial institution, which, at times, may exceed the Federal Depository Insurance Coverage limit of $250,000. As of December 31, 2022 and 2021, the Company has not experienced losses on these accounts and management believes the Company is not exposed to significant risks on such accounts.
Cash and Cash Equivalents	Cash and Cash Equivalents The Company considers all short-term investments with an original maturity of three months or less when purchased to be cash equivalents. The Company had no cash equivalents as of September 30, 2023 and December 31, 2022.	Cash and Cash Equivalents The Company considers all short-term investments with an original maturity of three months or less when purchased to be cash equivalents. The Company had no cash equivalents as of December 31, 2022 and 2021.
Investments Held in Trust Account	Cash and Investments Held in Trust Account The Company’s portfolio of investments is comprised of cash and U.S. government securities, within the meaning set forth in Section 2(a)(16) of the Investment Company Act, with a maturity of 185 days or less, or investments in money market funds that invest in U.S. government securities and generally have a readily determinable fair value, or a combination thereof. Cash held in the Trust Account is in a demand deposit account that accrues interest monthly. When the Company’s investments held in the Trust Account are comprised of U.S. government securities, the investments are classified as trading securities. When the Company’s investments held in the Trust Account are comprised of money market funds, the investments are recognized at fair value. Trading securities and investments in money market funds are presented on the balance sheets at fair value at the end of each reporting period. Gains and losses resulting from the change in fair value of these securities is included in unrealized gain on investments held in Trust Account in the accompanying statements of operations. The estimated fair values of investments held in the Trust Account are determined using available market information, other than for investments in open-ended money market funds with published daily net asset values (“NAV”), in which case the Company uses NAV as a practical expedient to fair value. The NAV on these investments is typically held constant at $1.00 per unit. The Trust Account may also contain balances of cash as result of investment activity.	Investments Held in Trust Account The Company’s portfolio of investments is comprised of U.S. government securities, within the meaning set forth in Section 2(a)(16) of the Investment Company Act, with a maturity of 185 days or less, or investments in money market funds that invest in U.S. government securities and generally have a readily determinable fair value, or a combination thereof. When the Company’s investments held in the Trust Account are comprised of U.S. government securities, the investments are classified as trading securities. When the Company’s investments held in the Trust Account are comprised of money market funds, the investments are recognized at fair value. Trading securities and investments in money market funds are presented on the balance sheets at fair value at the end of each reporting period. Gains and losses resulting from the change in fair value of these securities is included in unrealized gain on investments held in Trust Account in the accompanying statements of operations. The estimated fair values of investments held in the Trust Account are determined using available market information, other than for investments in open-ended money market funds with published daily net asset values (“ NAV
Use of Estimates	Use of Estimates The preparation of unaudited condensed financial statements in conformity with U.S. GAAP requires the Company’s management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statement. Making estimates requires management to exercise significant judgment. It is at least reasonably possible that the estimate of the effect of a condition, situation or set of circumstances that existed at the date of the financial statement, which management considered in formulating its estimate, could change in the near term due to one or more future confirming events. Accordingly, the actual results could differ significantly from those estimates.	Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires the Company’s management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statement. Making estimates requires management to exercise significant judgment. It is at least reasonably possible that the estimate of the effect of a condition, situation or set of circumstances that existed at the date of the financial statement, which management considered in formulating its estimate, could change in the near term due to one or more future confirming events. Accordingly, the actual results could differ significantly from those estimates.
Fair Value of Financial Instruments	Fair Value of Financial Instruments The fair value of the Company’s assets and liabilities, which qualify as financial instruments under the FASB ASC Topic 820, “Fair Value Measurements,” approximates the carrying amounts represented in the balance sheet.	Fair Value of Financial Instruments The fair value of the Company’s assets and liabilities, which qualify as financial instruments under the FASB ASC Topic 820, “Fair Value Measurements,” approximates the carrying amounts represented in the balance sheet.
Fair Value Measurements	Fair Value Measurements Fair value is defined as the price that would be received for sale of an asset or paid for transfer of a liability, in an orderly transaction between market participants at the measurement date. GAAP establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). These tiers include: • Level 1, defined as observable inputs such as quoted prices for identical instruments in active markets; • Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable such as quoted prices for similar instruments in active markets or quoted prices for identical or similar instruments in markets that are not active; and • Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions, such as valuations derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable. In some circumstances, the inputs used to measure fair value might be categorized within different levels of the fair value hierarchy. In those instances, the fair value measurement is categorized in its entirety in the fair value hierarchy based on the lowest level input that is significant to the fair value measurement.	Fair Value Measurements Fair value is defined as the price that would be received for sale of an asset or paid for transfer of a liability, in an orderly transaction between market participants at the measurement date. GAAP establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). These tiers include: • Level 1, defined as observable inputs such as quoted prices for identical instruments in active markets; • Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable such as quoted prices for similar instruments in active markets or quoted prices for identical or similar instruments in markets that are not active; and • Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions, such as valuations derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable. In some circumstances, the inputs used to measure fair value might be categorized within different levels of the fair value hierarchy. In those instances, the fair value measurement is categorized in its entirety in the fair value hierarchy based on the lowest level input that is significant to the fair value measurement.
Working Capital Loan Option	Working Capital Loan Option On January 19, 2022, the Sponsor agreed to loan the Company up to $500,000 to be used for a portion of the expenses of the Company. On July 27, 2022, the Sponsor agreed to loan the Company up to $475,000. The notes are due upon consummation of our Business Combination, without interest. At the option of the Sponsor, the outstanding principle of the notes may be converted into that number of warrants (“Conversion Warrants”) equal to the outstanding principle of the note divided by $1.50. The option (“Working Capital Loan Option”) to convert the working capital loans into warrants qualifies as an embedded derivative under ASC 815 and is required to be recognized at fair value with subsequent changes in fair value recognized in Company’s statements of operations each reporting period until the loan is repaid or converted. As of September 30, 2023 and December 31, 2022, the fair value of the Working Capital Loan Option was $0, and the Working Capital Loan is held at cost of $850,000 and $500,000, respectively, see Note 9.	Working Capital Loan Option On January 19, 2022, the Sponsor agreed to loan the Company up to $500,000 to be used for a portion of the expenses of the Company. The note is due upon consummation of our Business Combination, without interest. At the option of the Sponsor, the outstanding principle of $500,000 may be converted into that number of warrants (“ Conversion Warrants Working Capital Loan Option under ASC 815 and is required to be recognized at fair value with subsequent changes in fair value recognized in Company’s statements of operations each reporting period until the loan is repaid or converted. As of December 31, 2022, the fair value of the Working Capital Loan Option was $500,000, see Note 9.
Derivative warrant liabilities	Derivative Warrant Liabilities The Company does not use derivative instruments to hedge exposures to cash flow, market, or foreign currency risks. The Company evaluates all of its financial instruments, including issued share purchase warrants, to determine if such instruments are derivatives or contain features that qualify as embedded derivatives, pursuant to FASB ASC Topic 480 and ASC Topic 815, “Derivatives and Hedging” (“ASC 815”). The classification of derivative instruments, including whether such instruments should be recorded as liabilities or as equity, is re-assessed at the end of each reporting period. The warrants issued in the Initial Public Offering (the “Public Warrants”) and the Private Placement Warrants are recognized as derivative liabilities in accordance with ASC 815. Accordingly, the Company recognizes the warrant instruments as liabilities at fair value and adjust the instruments to fair value at each reporting period. The liabilities are subject to remeasurement at each balance sheet date until exercised, and any change in fair value is recognized in the Company’s statement of operations. The fair value of warrants issued in connection with the Initial Public Offering and Private Placement were initially measured at fair value using a Monte Carlo simulation model and subsequently, the fair value of the Private Placement warrants have been estimated using a Monte Carlo simulation model each measurement date. The fair value of Warrants issued in connection with our Initial Public Offering have subsequently been measured based on the listed market price of such warrants.	Derivative Warrant Liabilities The Company does not use derivative instruments to hedge exposures to cash flow, market, or foreign currency risks. The Company evaluates all of its financial instruments, including issued share purchase warrants, to determine if such instruments are derivatives or contain features that qualify as embedded derivatives, pursuant to FASB ASC Topic 480 and ASC Topic 815, “Derivatives and Hedging” (“ ASC 815 The warrants issued in the Initial Public Offering (the “ Public Warrants
Offering Costs Associated with the Initial Public Offering	Offering Costs Associated with the Initial Public Offering Offering costs consisted of legal, accounting, underwriting and other costs incurred in connection with the Initial Public Offering that were directly related to the Initial Public Offering. Offering costs were allocated to the separable financial instruments issued in the Initial Public Offering based on a relative fair value basis, compared to total proceeds received. Offering costs associated with derivative warrant liabilities were expensed as incurred and presented as non-operating expenses in the statements of operations. Offering costs associated with the issuance of the Class A ordinary shares were charged against the carrying value of the Class A ordinary shares subject to possible redemption upon the completion of the Initial Public Offering. The Company classifies deferred underwriting commissions as non-current liabilities as their liquidation is not reasonably expected to require the use of current assets or require the creation of current liabilities.	Offering Costs Associated with the Initial Public Offering Offering costs consisted of legal, accounting, underwriting and other costs incurred in connection with the Initial Public Offering that were directly related to the Initial Public Offering. Offering costs were allocated to the separable financial instruments issued in the Initial Public Offering based on a relative fair value basis, compared to total proceeds received. Offering costs associated with derivative warrant liabilities were expensed as incurred and presented as non-operating expenses in the statements of operations. Offering costs associated with the issuance of the Class A ordinary shares were charged against the carrying value of the Class A ordinary shares subject to possible redemption upon the completion of the Initial Public Offering. The Company classifies deferred underwriting commissions as non-current liabilities as their liquidation is not reasonably expected to require the use of current assets or require the creation of current liabilities.
Class A Ordinary Shares Subject to Possible Redemption	Class A Ordinary Shares Subject to Possible Redemption The Company accounts for its Class A ordinary shares subject to possible redemption in accordance with ASC 480. Class A ordinary shares subject to mandatory redemption (if any) are classified as liability instruments and are measured at fair value. Conditionally redeemable Class A ordinary shares (including Class A ordinary shares that feature redemption rights that are either within the control of the holder or subject to redemption upon the occurrence of uncertain events not solely within the Company’s control) are classified as temporary equity. At all other times, Class A ordinary shares are classified as shareholders’ equity. The Company’s Class A ordinary shares feature certain redemption rights that are considered to be outside of the Company’s control and subject to the occurrence of uncertain future events. Accordingly, as of September 30, 2023 and December 31, 2022, 635,778 and 48,300,000 Class A ordinary shares subject to possible redemption, respectively, are presented at redemption value as temporary equity, outside of the shareholders’ equity section of the Company’s balance sheet. Effective with the closing of the Initial Public Offering, the Company recognized the accretion from initial book value to redemption amount, which resulted in charges against additional paid-in capital (to the extent available) and accumulated deficit.	Class A Ordinary Shares Subject to Possible Redemption The Company accounts for its Class A ordinary shares subject to possible redemption in accordance with ASC 480. Class A ordinary shares subject to mandatory redemption (if any) are classified as liability instruments and are measured at fair value. Conditionally redeemable Class A ordinary shares (including Class A ordinary shares that feature redemption rights that are either within the control of the holder or subject to redemption upon the occurrence of uncertain events not solely within the Company’s control) are classified as temporary equity. At all other times, Class A ordinary shares are classified as shareholders’ equity. The Company’s Class A ordinary shares feature certain redemption rights that are considered to be outside of the Company’s control and subject to the occurrence of uncertain future events. Accordingly, as of December 31, 2022 and 2021, 48,300,000 Class A ordinary shares subject to possible redemption are presented at redemption value as temporary equity, outside of the shareholders’ equity section of the Company’s balance sheet. Effective with the closing of the Initial Public Offering, the Company recognized the accretion from initial book value to redemption amount, which resulted in charges against additional paid-in capital (to the extent available) and accumulated deficit.
Income Taxes	Income Taxes The Company complies with the accounting and reporting requirements of ASC Topic 740, “Income Taxes” (“ASC 740”), which requires an asset and liability approach to financial accounting and reporting for income taxes. Deferred income tax assets and liabilities are computed for differences between the financial statement and tax bases of assets and liabilities that will result in future taxable or deductible amounts, based on enacted tax laws and rates applicable to the periods in which the differences are expected to affect taxable income. Valuation allowances are established, when necessary, to reduce deferred tax assets to the amount expected to be realized. ASC 740 prescribes a recognition threshold and a measurement attribute for the financial statement recognition and measurement of tax positions taken or expected to be taken in a tax return. For those benefits to be recognized, a tax position must be more-likely-than-not to be sustained upon examination by taxing authorities. The Company’s management determined that the Cayman Islands is the Company’s only major tax jurisdiction. The Company recognizes accrued interest and penalties related to unrecognized tax benefits as income tax expense. There were no unrecognized tax benefits and no amounts accrued for interest and penalties as of September 30, 2023. The Company is currently not aware of any issues under review that could result in significant payments, accruals or material deviation from its position. There is currently no taxation imposed on income by the Government of the Cayman Islands. In accordance with Cayman federal income tax regulations, income taxes are not levied on the Company. Consequently, income taxes are not reflected in the Company’s financial statement. The Company’s management does not expect that the total amount of unrecognized tax benefits will materially change over the next twelve months.	Income Taxes The Company complies with the accounting and reporting requirements of ASC Topic 740, “Income Taxes” (“ ASC 740 tax bases of assets and liabilities that will result in future taxable or deductible amounts, based on enacted tax laws and rates applicable to the periods in which the differences are expected to affect taxable income. Valuation allowances are established, when necessary, to reduce deferred tax assets to the amount expected to be realized. ASC 740 prescribes a recognition threshold and a measurement attribute for the financial statement recognition and measurement of tax positions taken or expected to be taken in a tax return. For those benefits to be recognized, a tax position must be more-likely-than-not to be sustained upon examination by taxing authorities. The Company’s management determined that the Cayman Islands is the Company’s only major tax jurisdiction. The Company recognizes accrued interest and penalties related to unrecognized tax benefits as income tax expense. There were no unrecognized tax benefits and no amounts accrued for interest and penalties as of December 31, 2022 and 2021. The Company is currently not aware of any issues under review that could result in significant payments, accruals or material deviation from its position. There is currently no taxation imposed on income by the Government of the Cayman Islands. In accordance with Cayman federal income tax regulations, income taxes are not levied on the Company. Consequently, income taxes are not reflected in the Company’s financial statement. The Company’s management does not expect that the total amount of unrecognized tax benefits will materially change over the next twelve months.
Net Income Per Ordinary Share	Net (Loss) Income Per Ordinary Share The Company has two classes of shares issued and outstanding: Class A ordinary shares and Class B ordinary shares. Income and losses are shared pro rata between the two classes of shares. Net (loss) income per ordinary share is computed by dividing net (loss) income by the weighted-average number of ordinary shares outstanding during the periods. The Company has not considered the effect of the warrants sold in the Initial Public Offering and the Private Placement to purchase an aggregate of 17,876,330, of the Company’s Class A ordinary shares in the calculation of diluted net (loss) income per share, because their exercise is contingent upon future events and their inclusion would be anti-dilutive under the treasury stock method. As a result, diluted net (loss) income per share is the same as basic net (loss) income per share for the three and nine months ended September 30, 2023 and 2022. Accretion associated with the Class A ordinary shares subject to possible redemption is excluded from earnings per share, as the redemption value approximates fair value. The following table presents a reconciliation of the numerator and denominator used to compute basic and diluted net (loss) income per share for each ordinary share class. ​ ​ For the Three Months Ended September 30, ​ ​ For the Nine Months Ended September 30, ​ ​ 2023 ​ ​ 2022 ​ ​ 2023 ​ ​ 2022 ​ ​ Class A ​ ​ Class B ​ ​ Class A ​ ​ Class B ​ ​ Class A ​ ​ Class B ​ ​ Class A ​ ​ Class B Basic and diluted net (loss) income per common share: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Numerator: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allocation of net (loss) income ​ ​ $(101,278) ​ ​ $ (1,645,286) ​ ​ $ 949,460 ​ ​ $ 237,365 ​ ​ $(1,450,300) ​ ​ $ (6,325,489) ​ $10,917,529 ​ ​ $ 2,729,382 Denominator: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Basic and diluted weighted average common shares outstanding ​ ​ 743,298 ​ ​ 12,075,000 ​ ​ 48,300,000 ​ ​ 12,075,000 ​ ​ 2,768,541 ​ ​ 12,075,000 ​ ​ 48,300,000 ​ ​ 12,075,000 Basic and diluted net (loss) income per common share ​ ​ $ (0.14) ​ ​ $ (0.14) ​ ​ $ 0.02 ​ ​ $ 0.02 ​ ​ $ (0.52) ​ ​ $ (0.52) ​ ​ $ 0.23 ​ ​ $ 0.23	Net Income per Ordinary Share The Company has two classes of shares issued and outstanding: Class A ordinary shares and Class B ordinary shares. Income and losses are shared pro rata between the two classes of shares. Net income per ordinary share is computed by dividing net income by the weighted-average number of ordinary shares outstanding during the periods. The Company has not considered the effect of the warrants sold in the Initial Public Offering and the Private Placement to purchase an aggregate of 17,876,330, of the Company’s Class A ordinary shares in the calculation of diluted net income per share, because their exercise is contingent upon future events and their exercise is contingent upon future events. As a result, diluted net income per share is the same as basic net income per share for the years ended December 31, 2022 and 2021. Accretion associated with the Class A ordinary shares subject to possible redemption is excluded from earnings per share, as the redemption value approximates fair value. The following table presents a reconciliation of the numerator and denominator used to compute basic and diluted net income per share for each ordinary share class: ​ ​ For the Year Ended December 31, 2022 ​ ​ For the Year Ended December 31, 2021 ​ ​ Class A ​ ​ Class B ​ ​ Class A ​ ​ Class B Basic and diluted net income per common share: ​ ​ ​ ​ ​ ​ ​ ​ Numerator: ​ ​ ​ ​ ​ ​ ​ ​ Allocation of net income (loss) ​ ​ $12,700,862 ​ ​ $ 3,175,215 ​ ​ $ 5,468,324 ​ ​ $ 1,509,295 Denominator: ​ ​ ​ ​ ​ ​ ​ ​ Basic and diluted weighted average common shares outstanding ​ ​ 48,300,000 ​ ​ 12,075,000 ​ ​ 43,139,178 ​ ​ 11,906,712 Basic and diluted net income per common share ​ ​ $ 0.26 ​ ​ $ 0.26 ​ ​ $ 0.13 ​ ​ $ 0.13
Recent Accounting Pronouncements	Recent Accounting Pronouncements The Company’s management does not believe there are any recently issued, but not yet effective, accounting pronouncements if currently adopted would have a material effect on the Company’s unaudited condensed financial statements.	Recent Accounting Pronouncements The Company’s management does not believe there are any recently issued, but not yet effective, accounting pronouncements if currently adopted would have a material effect on the Company’s financial statements.

Summary of Significant Accoun_5

Summary of Significant Accounting Policies (Q3) (Tables)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Summary of Significant Accounting Policies [Abstract]
Summary of Class A Ordinary Shares Subject to Possible Redemption is Excluded from Earning Per Share	The following table presents a reconciliation of the numerator and denominator used to compute basic and diluted net (loss) income per share for each ordinary share class. ​ ​ For the Three Months Ended September 30, ​ ​ For the Nine Months Ended September 30, ​ ​ 2023 ​ ​ 2022 ​ ​ 2023 ​ ​ 2022 ​ ​ Class A ​ ​ Class B ​ ​ Class A ​ ​ Class B ​ ​ Class A ​ ​ Class B ​ ​ Class A ​ ​ Class B Basic and diluted net (loss) income per common share: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Numerator: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allocation of net (loss) income ​ ​ $(101,278) ​ ​ $ (1,645,286) ​ ​ $ 949,460 ​ ​ $ 237,365 ​ ​ $(1,450,300) ​ ​ $ (6,325,489) ​ $10,917,529 ​ ​ $ 2,729,382 Denominator: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Basic and diluted weighted average common shares outstanding ​ ​ 743,298 ​ ​ 12,075,000 ​ ​ 48,300,000 ​ ​ 12,075,000 ​ ​ 2,768,541 ​ ​ 12,075,000 ​ ​ 48,300,000 ​ ​ 12,075,000 Basic and diluted net (loss) income per common share ​ ​ $ (0.14) ​ ​ $ (0.14) ​ ​ $ 0.02 ​ ​ $ 0.02 ​ ​ $ (0.52) ​ ​ $ (0.52) ​ ​ $ 0.23 ​ ​ $ 0.23	The following table presents a reconciliation of the numerator and denominator used to compute basic and diluted net income per share for each ordinary share class: ​ ​ For the Year Ended December 31, 2022 ​ ​ For the Year Ended December 31, 2021 ​ ​ Class A ​ ​ Class B ​ ​ Class A ​ ​ Class B Basic and diluted net income per common share: ​ ​ ​ ​ ​ ​ ​ ​ Numerator: ​ ​ ​ ​ ​ ​ ​ ​ Allocation of net income (loss) ​ ​ $12,700,862 ​ ​ $ 3,175,215 ​ ​ $ 5,468,324 ​ ​ $ 1,509,295 Denominator: ​ ​ ​ ​ ​ ​ ​ ​ Basic and diluted weighted average common shares outstanding ​ ​ 48,300,000 ​ ​ 12,075,000 ​ ​ 43,139,178 ​ ​ 11,906,712 Basic and diluted net income per common share ​ ​ $ 0.26 ​ ​ $ 0.26 ​ ​ $ 0.13 ​ ​ $ 0.13

Class A Ordinary Shares Subje_3

Class A Ordinary Shares Subject to Possible Redemption (Q3) (Tables)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Temporary Equity Disclosure [Abstract]
Summary of Ordinary Shares Issued Recognized in Class A Ordinary Shares Subject to Possible Redemption	The Class A ordinary shares issued in the Initial Public Offering were recognized in Class A ordinary shares subject to possible redemption as follows: Class A ordinary shares subject to possible redemption at December 31, 2021 ​ ​ $ 483,000,000 Increase in redemption value of Class A ordinary shares subject to possible redeem ​ ​ 4,168,822 Class A ordinary shares subject to possible redemption at December 31, 2022 ​ ​ 487,168,822 Redemptions of Class A ordinary shares ​ ​ (480,946,296) Increase in redemption value of Class A ordinary shares subject to possible redeem ​ ​ 135,254 Class A ordinary shares subject to possible redemption at September 30, 2023 ​ ​ $ 6,357,780	The Class A ordinary shares issued in the Initial Public Offering were recognized in Class A ordinary shares subject to possible redemption as follows: Gross Proceeds ​ ​ $483,000,000 Less: ​ ​ Offering costs allocated to Class A shares subject to possible redemption ​ ​ (26,406,165) Proceeds allocated to Public Warrants at issuance ​ ​ (12,863,680) Plus: ​ ​ Accrection on Class A ordinary shares subject to possible redemption amount ​ ​ 39,269,845 Class A ordinary shares subject to possible redemption at December 31, 2021 ​ ​ 483,000,000 Increase in redemption value of Class A ordinary shares subject to possible redeem ​ ​ 4,168,822 Class A ordinary shares subject to possible redemption at December 31, 2022 ​ ​ $487,168,822

Fair Value Measurements (Q3) (T

Fair Value Measurements (Q3) (Tables)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Schedule of Company's Assets and Liabilities that are Measured at Fair Value on a Recurring Basis	The following table presents information about the Company’s assets and liabilities that are measured at fair value on a recurring basis as of September 30, 2023 and December 31, 2022 and indicates the fair value hierarchy of the valuation techniques that the Company utilized to determine such fair value. September 30, 2023 Description ​ ​ Level 1 ​ ​ Level 2 ​ ​ Level 3 Assets: ​ ​ ​ ​ ​ ​ Cash held in Trust Account ​ ​ $6,655,195 ​ ​ $— ​ ​ $ — Liabilities: ​ ​ ​ ​ ​ ​ Derivative liabilities - Public Warrants ​ ​ $1,255,800 ​ ​ $— ​ ​ $ — Derivative liabilities - Private Warrants ​ ​ $ — ​ ​ $— ​ ​ $1,068,123 December 31, 2022 Description ​ ​ Level 1 ​ ​ Level 2 ​ ​ Level 3 Assets: ​ ​ ​ ​ ​ ​ Investments held in Trust Account - Money Market Funds ​ ​ $487,268,822 ​ ​ $— ​ ​ $ — Liabilities: ​ ​ ​ ​ ​ ​ Derivative liabilities - Public Warrants ​ ​ $ 289,800 ​ ​ $— ​ ​ $ — Derivative liabilities - Private Warrants ​ ​ $ — ​ ​ $— ​ ​ $246,500	The following table presents information about the Company’s assets and liabilities that are measured at fair value on a recurring basis as of December 31, 2022 and 2021 and indicates the fair value hierarchy of the valuation techniques that the Company utilized to determine such fair value. DECEMBER 31, 2022 Description ​ ​ Level 1 ​ ​ Level 2 ​ ​ Level 3 Assets: ​ ​ ​ ​ ​ ​ Investments held in Trust Account - Money Market Funds ​ ​ $487,268,822 ​ ​ $— ​ ​ $ — Liabilities: ​ ​ ​ ​ ​ ​ Derivative liabilities - Public Warrants ​ ​ $ 289,800 ​ ​ $— ​ ​ $ — Derivative liabilities - Private Warrants ​ ​ $ — ​ ​ $— ​ ​ $246,500 DECEMBER 31, 2021 Description ​ ​ Level 1 ​ ​ Level 2 ​ ​ Level 3 Assets: ​ ​ ​ ​ ​ ​ Investments held in Trust Account - U.S. Treasury Securities ​ ​ $483,012,312 ​ ​ $— ​ ​ $ — Liabilities: ​ ​ ​ ​ ​ ​ Derivative liabilities - Public Warrants ​ ​ $ 7,728,000 ​ ​ $— ​ ​ $ — Derivative liabilities - Private Warrants ​ ​ $ — ​ ​ $— ​ ​ $6,573,100
Schedule of Quantitative Information Regarding Level 3 Fair Value Measurements Inputs	The following table provides quantitative information regarding Level 3 fair value measurements inputs at their measurement dates: Private Warrants Private Warrants ​ ​ As of December 31, 2022 ​ ​ As of September 30, 2023 Stock price ​ ​ $10.09 ​ ​ $10.55 Volatility ​ ​ 6.9% ​ ​ 6.7% Expected life of the options to convert ​ ​ 5.47 ​ ​ 0.94 Risk-free rate ​ ​ 4.73% ​ ​ 5.47% Dividend yield ​ ​ — ​ ​ — Working Capital Loan Option ​ ​ December 31, 2022 ​ ​ September 30, 2023 Strike price of debt conversion ​ ​ $1.50 ​ ​ $1.50 Volatility ​ ​ 6.9% ​ ​ 6.7% Expected life of the options to convert ​ ​ 5.47 ​ ​ 5.31 Risk-free rate ​ ​ 4.72% ​ ​ 5.55% Dividend yield ​ ​ — ​ ​ —	The following table provides quantitative information regarding Level 3 fair value measurements inputs at their measurement dates: Private Warrants Private Warrants ​ ​ As of December 31, 2022 ​ ​ As of December 31, 2021 Stock price ​ ​ $10.09 ​ ​ $9.77 Volatility ​ ​ 6.9% ​ ​ 15.3% Expected life of the options to convert ​ ​ 5.47 ​ ​ 5.60 Risk-free rate ​ ​ 4.73% ​ ​ 1.32% Dividend yield ​ ​ — ​ ​ — Working Capital Loan Option ​ ​ December 31, 2022 Strike price of debt conversion ​ ​ $1.50 Volatility ​ ​ 6.9% Expected life of the options to convert ​ ​ 5.47 Risk-free rate ​ ​ 4.72% Dividend yield ​ ​ —
Schedule of Change in the Fair Value of the Warrant Liabilities	The change in the level 3 fair value of the derivative warrant liabilities for the period ended September 30, 2023 and December 31, 2022 is summarized as follows: ​ ​ Private Warrants Derivative warrant liabilities at December 31, 2022 ​ ​ $ 246,500 Change in fair value of derivative warrant liabilities ​ ​ 944,868 Derivative warrant liabilities at March 31, 2023 ​ ​ 1,191,368 Change in fair value of derivative warrant liabilities ​ ​ (286,750) Derivative warrant liabilities at June 30, 2023 ​ ​ $ 904,618 Change in fair value of derivative warrant liabilities ​ ​ 163,505 Derivative warrant liabilities at September 30, 2023 ​ ​ $ 1,068,123 Derivative warrant liabilities at December 31, 2021 ​ ​ $ 6,573,100 Change in fair value of derivative warrant liabilities ​ ​ (2,946,400) Derivative warrant liabilities at March 31, 2022 ​ ​ 3,626,700 ​ ​ Private Warrants Change in fair value of derivative warrant liabilities ​ ​ (2,969,400) Derivative warrant liabilities at June 30, 2022 ​ ​ $ 657,300 Change in fair value of derivative warrant liabilities ​ ​ 320,400 Derivative warrant liabilities at September 30, 2022 ​ ​ $ 977,700 The change in the fair value of the Working Capital Loan Option measured with Level 3 inputs for the period ended September 30, 2023 and December 31, 2022 is summarized as follows: Balance at December 31, 2021 ​ ​ $ — Initial fair value of the Working Capital Loan Option ​ ​ 7,885 Change in fair value ​ ​ (7,885) Balance at December 31, 2022 and September 30, 2023 ​ ​ $ —	The change in the level 3 fair value of the derivative warrant liabilities for the years ended December 31, 2022 and 2021 is summarized as follows: ​ ​ Public Warrants ​ ​ Private Warrants ​ ​ Total Derivative warrant liabilities at December 31, 2020 ​ ​ $ — ​ ​ $ — ​ ​ $ — Issuance of Public and Private Warrants ​ ​ 12,863,680 ​ ​ 10,941,230 ​ ​ 23,804,910 Transfer of Public Warrants to Level 1 ​ ​ (13,524,000) ​ ​ — ​ ​ (13,524,000) Change in fair value of derivative warrant liabilities ​ ​ 660,320 ​ ​ (4,368,130) ​ ​ (3,707,810) Derivative warrant liabilities at December 31, 2021 ​ ​ — ​ ​ 6,573,100 ​ ​ 6,573,100 Change in fair value of derivative ​ ​ — ​ ​ (6,326,600) ​ ​ (6,326,600) Derivative warrant liabilities at December 31, 2022 ​ ​ $ — ​ ​ $ 246,500 ​ ​ $ 246,500 The change in the fair value of the Working Capital Loan Option measured with Level 3 inputs for the year ended December 31, 2022 is summarized as follows: Balance at December 31, 2021 ​ ​ $ — Initial fair value of the Working Capital Loan Option ​ ​ 7,885 Change in fair value ​ ​ (7,885) Balance at December 31, 2022 ​ ​ $ —

Summary of Significant Accoun_6

Summary of Significant Accounting Policies (FY) (Tables)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Summary of Significant Accounting Policies [Abstract]
Summary of Class A Ordinary Shares Subject to Possible Redemtion is Excluded from Earning Per Share	The following table presents a reconciliation of the numerator and denominator used to compute basic and diluted net (loss) income per share for each ordinary share class. ​ ​ For the Three Months Ended September 30, ​ ​ For the Nine Months Ended September 30, ​ ​ 2023 ​ ​ 2022 ​ ​ 2023 ​ ​ 2022 ​ ​ Class A ​ ​ Class B ​ ​ Class A ​ ​ Class B ​ ​ Class A ​ ​ Class B ​ ​ Class A ​ ​ Class B Basic and diluted net (loss) income per common share: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Numerator: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Allocation of net (loss) income ​ ​ $(101,278) ​ ​ $ (1,645,286) ​ ​ $ 949,460 ​ ​ $ 237,365 ​ ​ $(1,450,300) ​ ​ $ (6,325,489) ​ $10,917,529 ​ ​ $ 2,729,382 Denominator: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Basic and diluted weighted average common shares outstanding ​ ​ 743,298 ​ ​ 12,075,000 ​ ​ 48,300,000 ​ ​ 12,075,000 ​ ​ 2,768,541 ​ ​ 12,075,000 ​ ​ 48,300,000 ​ ​ 12,075,000 Basic and diluted net (loss) income per common share ​ ​ $ (0.14) ​ ​ $ (0.14) ​ ​ $ 0.02 ​ ​ $ 0.02 ​ ​ $ (0.52) ​ ​ $ (0.52) ​ ​ $ 0.23 ​ ​ $ 0.23	The following table presents a reconciliation of the numerator and denominator used to compute basic and diluted net income per share for each ordinary share class: ​ ​ For the Year Ended December 31, 2022 ​ ​ For the Year Ended December 31, 2021 ​ ​ Class A ​ ​ Class B ​ ​ Class A ​ ​ Class B Basic and diluted net income per common share: ​ ​ ​ ​ ​ ​ ​ ​ Numerator: ​ ​ ​ ​ ​ ​ ​ ​ Allocation of net income (loss) ​ ​ $12,700,862 ​ ​ $ 3,175,215 ​ ​ $ 5,468,324 ​ ​ $ 1,509,295 Denominator: ​ ​ ​ ​ ​ ​ ​ ​ Basic and diluted weighted average common shares outstanding ​ ​ 48,300,000 ​ ​ 12,075,000 ​ ​ 43,139,178 ​ ​ 11,906,712 Basic and diluted net income per common share ​ ​ $ 0.26 ​ ​ $ 0.26 ​ ​ $ 0.13 ​ ​ $ 0.13

Class A Ordinary Shares Subje_4

Class A Ordinary Shares Subject to Possible Redemption (FY) (Tables)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Temporary Equity Disclosure [Abstract]
Summary Of Ordinary shares Issued Rrecognized in Class A Ordinary Shares Subject To Possible Redemption	The Class A ordinary shares issued in the Initial Public Offering were recognized in Class A ordinary shares subject to possible redemption as follows: Class A ordinary shares subject to possible redemption at December 31, 2021 ​ ​ $ 483,000,000 Increase in redemption value of Class A ordinary shares subject to possible redeem ​ ​ 4,168,822 Class A ordinary shares subject to possible redemption at December 31, 2022 ​ ​ 487,168,822 Redemptions of Class A ordinary shares ​ ​ (480,946,296) Increase in redemption value of Class A ordinary shares subject to possible redeem ​ ​ 135,254 Class A ordinary shares subject to possible redemption at September 30, 2023 ​ ​ $ 6,357,780	The Class A ordinary shares issued in the Initial Public Offering were recognized in Class A ordinary shares subject to possible redemption as follows: Gross Proceeds ​ ​ $483,000,000 Less: ​ ​ Offering costs allocated to Class A shares subject to possible redemption ​ ​ (26,406,165) Proceeds allocated to Public Warrants at issuance ​ ​ (12,863,680) Plus: ​ ​ Accrection on Class A ordinary shares subject to possible redemption amount ​ ​ 39,269,845 Class A ordinary shares subject to possible redemption at December 31, 2021 ​ ​ 483,000,000 Increase in redemption value of Class A ordinary shares subject to possible redeem ​ ​ 4,168,822 Class A ordinary shares subject to possible redemption at December 31, 2022 ​ ​ $487,168,822

Fair Value Measurements (FY) (T

Fair Value Measurements (FY) (Tables)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Schedule of company's assets that are measured at fair value on a recurring basis	The following table presents information about the Company’s assets and liabilities that are measured at fair value on a recurring basis as of September 30, 2023 and December 31, 2022 and indicates the fair value hierarchy of the valuation techniques that the Company utilized to determine such fair value. September 30, 2023 Description ​ ​ Level 1 ​ ​ Level 2 ​ ​ Level 3 Assets: ​ ​ ​ ​ ​ ​ Cash held in Trust Account ​ ​ $6,655,195 ​ ​ $— ​ ​ $ — Liabilities: ​ ​ ​ ​ ​ ​ Derivative liabilities - Public Warrants ​ ​ $1,255,800 ​ ​ $— ​ ​ $ — Derivative liabilities - Private Warrants ​ ​ $ — ​ ​ $— ​ ​ $1,068,123 December 31, 2022 Description ​ ​ Level 1 ​ ​ Level 2 ​ ​ Level 3 Assets: ​ ​ ​ ​ ​ ​ Investments held in Trust Account - Money Market Funds ​ ​ $487,268,822 ​ ​ $— ​ ​ $ — Liabilities: ​ ​ ​ ​ ​ ​ Derivative liabilities - Public Warrants ​ ​ $ 289,800 ​ ​ $— ​ ​ $ — Derivative liabilities - Private Warrants ​ ​ $ — ​ ​ $— ​ ​ $246,500	The following table presents information about the Company’s assets and liabilities that are measured at fair value on a recurring basis as of December 31, 2022 and 2021 and indicates the fair value hierarchy of the valuation techniques that the Company utilized to determine such fair value. DECEMBER 31, 2022 Description ​ ​ Level 1 ​ ​ Level 2 ​ ​ Level 3 Assets: ​ ​ ​ ​ ​ ​ Investments held in Trust Account - Money Market Funds ​ ​ $487,268,822 ​ ​ $— ​ ​ $ — Liabilities: ​ ​ ​ ​ ​ ​ Derivative liabilities - Public Warrants ​ ​ $ 289,800 ​ ​ $— ​ ​ $ — Derivative liabilities - Private Warrants ​ ​ $ — ​ ​ $— ​ ​ $246,500 DECEMBER 31, 2021 Description ​ ​ Level 1 ​ ​ Level 2 ​ ​ Level 3 Assets: ​ ​ ​ ​ ​ ​ Investments held in Trust Account - U.S. Treasury Securities ​ ​ $483,012,312 ​ ​ $— ​ ​ $ — Liabilities: ​ ​ ​ ​ ​ ​ Derivative liabilities - Public Warrants ​ ​ $ 7,728,000 ​ ​ $— ​ ​ $ — Derivative liabilities - Private Warrants ​ ​ $ — ​ ​ $— ​ ​ $6,573,100
Schedule of quantitative information regarding Level 3 fair value measurements inputs	The following table provides quantitative information regarding Level 3 fair value measurements inputs at their measurement dates: Private Warrants Private Warrants ​ ​ As of December 31, 2022 ​ ​ As of September 30, 2023 Stock price ​ ​ $10.09 ​ ​ $10.55 Volatility ​ ​ 6.9% ​ ​ 6.7% Expected life of the options to convert ​ ​ 5.47 ​ ​ 0.94 Risk-free rate ​ ​ 4.73% ​ ​ 5.47% Dividend yield ​ ​ — ​ ​ — Working Capital Loan Option ​ ​ December 31, 2022 ​ ​ September 30, 2023 Strike price of debt conversion ​ ​ $1.50 ​ ​ $1.50 Volatility ​ ​ 6.9% ​ ​ 6.7% Expected life of the options to convert ​ ​ 5.47 ​ ​ 5.31 Risk-free rate ​ ​ 4.72% ​ ​ 5.55% Dividend yield ​ ​ — ​ ​ —	The following table provides quantitative information regarding Level 3 fair value measurements inputs at their measurement dates: Private Warrants Private Warrants ​ ​ As of December 31, 2022 ​ ​ As of December 31, 2021 Stock price ​ ​ $10.09 ​ ​ $9.77 Volatility ​ ​ 6.9% ​ ​ 15.3% Expected life of the options to convert ​ ​ 5.47 ​ ​ 5.60 Risk-free rate ​ ​ 4.73% ​ ​ 1.32% Dividend yield ​ ​ — ​ ​ — Working Capital Loan Option ​ ​ December 31, 2022 Strike price of debt conversion ​ ​ $1.50 Volatility ​ ​ 6.9% Expected life of the options to convert ​ ​ 5.47 Risk-free rate ​ ​ 4.72% Dividend yield ​ ​ —
Schedule of change in the fair value of the warrant liabilities	The change in the level 3 fair value of the derivative warrant liabilities for the period ended September 30, 2023 and December 31, 2022 is summarized as follows: ​ ​ Private Warrants Derivative warrant liabilities at December 31, 2022 ​ ​ $ 246,500 Change in fair value of derivative warrant liabilities ​ ​ 944,868 Derivative warrant liabilities at March 31, 2023 ​ ​ 1,191,368 Change in fair value of derivative warrant liabilities ​ ​ (286,750) Derivative warrant liabilities at June 30, 2023 ​ ​ $ 904,618 Change in fair value of derivative warrant liabilities ​ ​ 163,505 Derivative warrant liabilities at September 30, 2023 ​ ​ $ 1,068,123 Derivative warrant liabilities at December 31, 2021 ​ ​ $ 6,573,100 Change in fair value of derivative warrant liabilities ​ ​ (2,946,400) Derivative warrant liabilities at March 31, 2022 ​ ​ 3,626,700 ​ ​ Private Warrants Change in fair value of derivative warrant liabilities ​ ​ (2,969,400) Derivative warrant liabilities at June 30, 2022 ​ ​ $ 657,300 Change in fair value of derivative warrant liabilities ​ ​ 320,400 Derivative warrant liabilities at September 30, 2022 ​ ​ $ 977,700 The change in the fair value of the Working Capital Loan Option measured with Level 3 inputs for the period ended September 30, 2023 and December 31, 2022 is summarized as follows: Balance at December 31, 2021 ​ ​ $ — Initial fair value of the Working Capital Loan Option ​ ​ 7,885 Change in fair value ​ ​ (7,885) Balance at December 31, 2022 and September 30, 2023 ​ ​ $ —	The change in the level 3 fair value of the derivative warrant liabilities for the years ended December 31, 2022 and 2021 is summarized as follows: ​ ​ Public Warrants ​ ​ Private Warrants ​ ​ Total Derivative warrant liabilities at December 31, 2020 ​ ​ $ — ​ ​ $ — ​ ​ $ — Issuance of Public and Private Warrants ​ ​ 12,863,680 ​ ​ 10,941,230 ​ ​ 23,804,910 Transfer of Public Warrants to Level 1 ​ ​ (13,524,000) ​ ​ — ​ ​ (13,524,000) Change in fair value of derivative warrant liabilities ​ ​ 660,320 ​ ​ (4,368,130) ​ ​ (3,707,810) Derivative warrant liabilities at December 31, 2021 ​ ​ — ​ ​ 6,573,100 ​ ​ 6,573,100 Change in fair value of derivative ​ ​ — ​ ​ (6,326,600) ​ ​ (6,326,600) Derivative warrant liabilities at December 31, 2022 ​ ​ $ — ​ ​ $ 246,500 ​ ​ $ 246,500 The change in the fair value of the Working Capital Loan Option measured with Level 3 inputs for the year ended December 31, 2022 is summarized as follows: Balance at December 31, 2021 ​ ​ $ — Initial fair value of the Working Capital Loan Option ​ ​ 7,885 Change in fair value ​ ​ (7,885) Balance at December 31, 2022 ​ ​ $ —

Description of Organization a_3

Description of Organization and Business Operations (Q3) (Details)						9 Months Ended		12 Months Ended		33 Months Ended
	Aug. 04, 2023 USD ($) shares	Jun. 20, 2023 USD ($)	Jan. 11, 2023 USD ($) shares	Feb. 09, 2021 USD ($) $ / shares shares	Oct. 14, 2020 Business	Sep. 30, 2023 USD ($) $ / shares	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares	Sep. 30, 2023 USD ($) $ / shares
Subsidiary, Sale of Stock [Line Items]
Condition for future business combination number of businesses minimum | Business					1
Deferred underwriting commission						$ 250,000		$ 250,000	$ 250,000	$ 250,000
Proceeds from issuance initial public offering								0	483,000,000
Proceeds received from private placement								$ 0	12,324,495
Threshold minimum aggregate fair market value as a percentage of the net assets held in the Trust Account						80%		80%
Threshold percentage of outstanding voting securities of the target to be acquired by post-transaction company to complete business combination						50%		50%
Minimum net tangible assets upon consummation of merger	$ 5,000,001					$ 5,000,001		$ 5,000,001		5,000,001
Threshold percentage of Public Shares subject to redemption without the Company's prior written consent						15%		15%
Obligation to redeem Public Shares if entity does not complete a Business Combination (as a percent)						100%		100%
Redemption period upon closure						10 days		10 days
Maximum net interest to pay dissolution expenses						$ 100,000		$ 100,000
Minimum amount required for MVLS		$ 35,000,000
Number of calendar days from date of notice						180 days
Number of consecutive business days		30 days				10 days
Cash operating bank account						$ 310,838		22,339	93,599	310,838
Working capital						7,500,000		1,100,000		7,500,000
Aggregate purchase price						25,000		25,000
Loan from the Sponsor								0	30,212
Loans from working capital						850,000		500,000	$ 0	850,000
Investment income from Trust Account										5,913,216
Cash withdrawn from Trust Account for working capital purposes						1,230,308		43,317		1,311,725
Proceeds from Cash Withdrawal from Trust Account for Working Capital Purposes						$ 1,230,308	$ 27,010	$ 43,317		$ 4,304,076
Class A Common Stock [Member]
Subsidiary, Sale of Stock [Line Items]
Number of shares redeemed (in shares) | shares	282,624		47,381,598
Redemption amount	$ 2,942,664		$ 478,003,632
Ordinary shares, par value (in dollars per share) | $ / shares						$ 0.0001		$ 0.0001	$ 0.0001	$ 0.0001
Sponsor [Member]
Subsidiary, Sale of Stock [Line Items]
Loan from the Sponsor						$ 135,000		$ 135,000
Private Placement Warrants [Member]
Subsidiary, Sale of Stock [Line Items]
Sale of private placement warrants (in shares) | shares				8,216,330				8,216,330
Price of warrant (in dollars per share) | $ / shares				$ 1.5				$ 1.5
Proceeds received from private placement				$ 12,300,000				$ 12,300,000
Initial Public Offering [Member]
Subsidiary, Sale of Stock [Line Items]
Underwriting commission				$ 16,900,000
Sale of units in initial public offering, less allocation of proceeds to Public Warrants (in shares) | shares				48,300,000
Deferred underwriting commission				$ 250,000
Purchase price, per unit (in dollars per share) | $ / shares				$ 10
Proceeds from issuance initial public offering				$ 483,000,000
Offering costs				$ 27,100,000
Private Placement [Member]
Subsidiary, Sale of Stock [Line Items]
Sale of units in initial public offering, less allocation of proceeds to Public Warrants (in shares) | shares				483,000,000
Price of warrant (in dollars per share) | $ / shares				$ 1.5
Private Placement [Member] | Private Placement Warrants [Member]
Subsidiary, Sale of Stock [Line Items]
Sale of private placement warrants (in shares) | shares				8,216,330
Price of warrant (in dollars per share) | $ / shares				$ 1.5
Proceeds received from private placement				$ 12,300,000
Over-Allotment Units
Subsidiary, Sale of Stock [Line Items]
Sale of units in initial public offering, less allocation of proceeds to Public Warrants (in shares) | shares				6,300,000
Purchase price, per unit (in dollars per share) | $ / shares				$ 10

Summary of Significant Accoun_7

Summary of Significant Accounting Policies - Summary (Q3) (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022	Jul. 27, 2022	Jan. 19, 2022	Dec. 31, 2021
FDIC Insurance coverage amount	$ 250,000	$ 250,000
Cash equivalents	$ 0	$ 0			$ 0
Net asset value per share (in dollars per share)	$ 1	$ 1
Unrecognized tax benefits	$ 0	$ 0			0
Unrecognized tax benefits accrued for interest and penalties	$ 0	$ 0			$ 0
Anti-dilutive securities attributable to warrants (in shares)	17,876,330	17,876,330
Working Capital Convertible Debt [Member]
Fair value of working capital loan	$ 0	$ 500,000
Convertible working capital loan - related party	850,000	500,000
Working Capital Convertible Debt [Member] | Sponsor [Member]
Debt instrument, face amount				$ 500,000
Outstanding principal converted to warrants, conversion price (in dollars per share)			$ 1.5	$ 1.5
Related Party Loans [Member] | Promissory Note [Member]
Debt instrument, face amount	$ 350,000	$ 0
Related Party Loans [Member] | Promissory Note [Member] | Sponsor [Member]
Debt instrument, face amount			$ 475,000
Class A ordinary Shares Subject to Possible Redemption [Member]
Class A ordinary shares subject to possible redemption (in shares)	635,778	48,300,000			48,300,000

Summary of Significant Accoun_8

Summary of Significant Accounting Policies - Summary of Class A Ordinary Shares Subject to Possible Redemption is Excluded from Earning Per Share (Q3) (Details) - USD ($)	3 Months Ended						9 Months Ended		12 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Numerator:
Allocation of net (loss) income	$ (1,746,564)	$ (3,248,492)	$ (2,780,733)	$ 1,186,825	$ 6,684,896	$ 5,775,190	$ (7,775,789)	$ 13,646,911	$ 15,876,077	$ 6,977,619
Denominator:
Weighted average common shares outstanding, Basic (in shares)									12,075,000	11,906,712
Weighted average common shares outstanding, Diluted (in shares)									12,075,000	11,906,712
Net (loss) income share, Basic (in dollars per share)									$ 0.26	$ 0.13
Net (loss) income share, Diluted (in dollars per share)									$ 0.26	$ 0.13
Class A Common Stock [Member]
Numerator:
Allocation of net (loss) income	$ (101,278)			$ 949,460			$ (1,450,300)	$ 10,917,529	$ 12,700,862	$ 5,468,324
Denominator:
Weighted average common shares outstanding, Basic (in shares)	743,298			48,300,000			2,768,541	48,300,000	48,300,000	43,139,178
Weighted average common shares outstanding, Diluted (in shares)	743,298			48,300,000			2,768,541	48,300,000	48,300,000	43,139,178
Net (loss) income share, Basic (in dollars per share)	$ (0.14)			$ 0.02			$ (0.52)	$ 0.23	$ 0.26	$ 0.13
Net (loss) income share, Diluted (in dollars per share)	$ (0.14)			$ 0.02			$ (0.52)	$ 0.23	$ 0.26	$ 0.13
Class B Common Stock [Member]
Numerator:
Allocation of net (loss) income	$ (1,645,286)			$ 237,365			$ (6,325,489)	$ 2,729,382	$ 3,175,215	$ 1,509,295
Denominator:
Weighted average common shares outstanding, Basic (in shares)	12,075,000			12,075,000			12,075,000	12,075,000	12,075,000	11,906,712
Weighted average common shares outstanding, Diluted (in shares)	12,075,000			12,075,000			12,075,000	12,075,000	12,075,000	11,906,712
Net (loss) income share, Basic (in dollars per share)	$ (0.14)			$ 0.02			$ (0.52)	$ 0.23	$ 0.26	$ 0.13
Net (loss) income share, Diluted (in dollars per share)	$ (0.14)			$ 0.02			$ (0.52)	$ 0.23	$ 0.26	$ 0.13

Initial Public Offering (Q3) (D

Initial Public Offering (Q3) (Details) - USD ($)		12 Months Ended
	Feb. 09, 2021	Dec. 31, 2022	Dec. 31, 2021	Sep. 30, 2023
Subsidiary, Sale of Stock [Line Items]
Proceeds received from initial public offering, gross		$ 0	$ 483,000,000
Offering costs		0	9,810,697
Deferred underwriting commissions		16,905,000	16,905,000	$ 6,762,000
Deferred legal fees		$ 0	$ 250,000
Public Warrant [Member]
Subsidiary, Sale of Stock [Line Items]
Exercise price of warrants (in dollars per share)		$ 11.5		$ 11.5
Initial Public Offering [Member]
Subsidiary, Sale of Stock [Line Items]
Number of units issued (in shares)	48,300,000
Purchase price, per unit (in dollars per share)	$ 10
Proceeds received from initial public offering, gross	$ 483,000,000
Offering costs	27,100,000
Deferred underwriting commissions	16,900,000
Deferred legal fees	$ 250,000
Initial Public Offering [Member] | Public Warrant [Member]
Subsidiary, Sale of Stock [Line Items]
Number of shares in a unit (in shares)	1
Number of warrants in a unit (in shares)	0.2
Number of shares issuable per warrant (in shares)	1
Exercise price of warrants (in dollars per share)	$ 11.5
Over-Allotment Units [Member]
Subsidiary, Sale of Stock [Line Items]
Number of units issued (in shares)	6,300,000
Purchase price, per unit (in dollars per share)	$ 10

Related Party Transactions - Fo

Related Party Transactions - Founder Shares (Q3) (Details)		1 Months Ended	9 Months Ended	12 Months Ended
	Jan. 30, 2021 shares	Dec. 31, 2020 USD ($) shares	Sep. 30, 2023 USD ($) d $ / shares shares	Dec. 31, 2022 USD ($) Day $ / shares shares	Dec. 31, 2021 shares	Feb. 09, 2021 shares
Related Party Transaction [Line Items]
Aggregate purchase price | $			$ 25,000	$ 25,000
Class B Common Stock [Member]
Related Party Transaction [Line Items]
Stock split ratio	1.2
Common shares, shares outstanding (in shares)	12,075,000		12,075,000	12,075,000	12,075,000	10,062,500
Shares subject to forfeiture (in shares)	1,575,000
Percentage of issued and outstanding shares after the Initial Public Offering collectively held by initial stockholders			20%	20%
Founder Shares [Member] | Sponsor [Member] | Class B Common Stock [Member]
Related Party Transaction [Line Items]
Aggregate purchase price | $		$ 25,000
Number of shares issued (in shares)		10,062,500
Stock split ratio	1.2	1.2
Common shares, shares outstanding (in shares)	12,075,000
Shares subject to forfeiture (in shares)	1,575,000
Percentage of issued and outstanding shares after the Initial Public Offering collectively held by initial stockholders	20%
Shares no longer subject to forfeiture (in shares)						1,575,000
Stock price trigger to transfer, assign or sell any shares or warrants of the company, after the completion of the initial business combination (in dollars per share) | $ / shares			$ 12	$ 12
Threshold trading days for transfer, assign or sale of shares or warrants, after the completion of the initial business combination			20	20
Threshold consecutive trading days for transfer, assign or sale of shares or warrants, after the completion of the initial business combination			30	30
Threshold period after the business combination in which the 20 trading days within any 30 trading day period commences			150 days	150 days

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Q3) (Details) - USD ($)			3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 19, 2022	Feb. 09, 2021	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Jul. 27, 2022	Dec. 31, 2020
Related Party Transaction [Line Items]
Proceeds received from issuance of warrants							$ 0	$ 12,324,495
Bank overdrafts			$ 850,000		$ 850,000		500,000
Carrying value and principal value of loan			$ 850,000		$ 850,000		$ 500,000	$ 0
Notes Payable, Noncurrent, Related Party, Type [Extensible Enumeration]			Related Party [Member]		Related Party [Member]		Related Party [Member]	Related Party [Member]
Selling, General, and Administrative Expenses, Related Party, Type [Extensible Enumeration]							Related Party [Member]	Related Party [Member]
Sponsor [Member]
Related Party Transaction [Line Items]
Proceeds from Notes Payable	$ 500,000				$ 500,000		$ 500,000
Related Party [Member]
Related Party Transaction [Line Items]
Accrued expenses - related party			$ 240,000		240,000		120,000	$ 0
Embedded Derivative On Working Capital Loans [Member] | Sponsor [Member]
Related Party Transaction [Line Items]
Initial fair value of Working Capital Loan Option	7,900
Interest expense			0	$ 2,500	$ 0	$ 6,600	$ 8,000
Private Placement Warrants [Member]
Related Party Transaction [Line Items]
Number of warrants issued (in shares)		8,216,330					8,216,330
Price of warrant (in dollars per share)		$ 1.5					$ 1.5
Proceeds received from issuance of warrants		$ 12,300,000					$ 12,300,000
Exercise price of warrants (in dollars per share)		$ 11.5					$ 11.5
Period after completion of initial business combination					30 days		30 days
Administrative Services Agreement [Member]
Related Party Transaction [Line Items]
Expenses per month					$ 20,000		$ 20,000
Expenses incurred			$ 60,000	$ 60,000	$ 180,000	$ 180,000	240,000	220,000
Selling, General, and Administrative Expenses, Related Party, Type [Extensible Enumeration]			Related Party [Member]	Related Party [Member]	Related Party [Member]	Related Party [Member]
Accrued expenses - related party							120,000	$ 0
Administrative Services Agreement [Member] | Related Party [Member]
Related Party Transaction [Line Items]
Accrued expenses - related party			$ 240,000		$ 240,000		120,000
Related Party Loans [Member]
Related Party Transaction [Line Items]
Maximum borrowing capacity of related party promissory note										$ 300,000
Related Party Loans [Member] | Promissory Note [Member]
Related Party Transaction [Line Items]
Debt instrument, face amount			$ 350,000		$ 350,000		$ 0
Related Party Loans [Member] | Sponsor [Member] | Promissory Note [Member]
Related Party Transaction [Line Items]
Price of warrant (in dollars per share)									$ 1.5
Loan conversion agreement warrant									$ 1,500,000
Debt instrument, face amount									$ 475,000
Related Party Loans [Member] | Sponsor [Member] | Promissory Note [Member] | Warrant [Member]
Related Party Transaction [Line Items]
Price of warrant (in dollars per share)									$ 1.5
Loan conversion agreement warrant									$ 1,500,000
Related Party Loans [Member] | Working capital loans warrant [Member]
Related Party Transaction [Line Items]
Price of warrant (in dollars per share)			$ 1.5		$ 1.5		$ 1.5
Loan conversion agreement warrant			$ 1,500,000		$ 1,500,000		$ 1,500,000
Working Capital Convertible Debt [Member] | Sponsor [Member]
Related Party Transaction [Line Items]
Debt instrument, face amount	$ 500,000
Debt Instrument, Convertible, Conversion Price (in dollars per share)	$ 1.5								$ 1.5

Commitments & Contingencies (_2

Commitments & Contingencies (Q3) (Details)					3 Months Ended			9 Months Ended		12 Months Ended
	May 09, 2023 USD ($) $ / shares	Apr. 17, 2023 USD ($) Underwriters	Apr. 16, 2023 USD ($) Underwriters	Feb. 09, 2021 USD ($) $ / shares shares	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) Demand	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) $ / shares	Dec. 31, 2021 USD ($)
Commitments & contingencies [Line Items]
Granted term				45 days
Underwriting cash discount per unit (in dollars per share) | $ / shares										$ 0.2
Underwriter cash discount										$ 9,700,000
Deferred commission per unit (in dollars per share) | $ / shares										$ 0.35
Deferred underwriting commissions					$ 6,762,000			$ 6,762,000		$ 16,905,000	$ 16,905,000
Number of Underwriters | Underwriters			1
Deferred fee waived off			$ 10,143,000
Reduction in deferred underwriter commissions recognized as income			440,592		$ 0		$ 0	$ 440,592	$ 0
Reduction in deferred underwriter commissions recorded to additional paid-in capital			$ 9,702,408			$ 9,702,408
Advisor [Member]
Commitments & contingencies [Line Items]
Cash										500,000
Common Stock										$ 250,000
Merger Agreement [Member]
Commitments & contingencies [Line Items]
Common Stock	$ 750,000,000
Number of Underwriters | Underwriters		1
Deferred fee waived off		$ 6,762,000
Common stock, share price (in dollars per share) | $ / shares	$ 10
Duration of lock-up agreements	180 days
Duration of written notice to board of directors	15 days
Duration to terminate the Merger Agreement	10 days
Minimum breach curable period	30 days
Percentage of reimbursable costs					50%			50%
Reimbursable costs					$ 238,917			$ 238,917
General and Administrative Expense [Member] | Merger Agreement [Member]
Commitments & contingencies [Line Items]
Reimbursable cost recorded as reduction in related expenses included in general and administrative expenses								$ 119,458
Maximum [Member]
Commitments & contingencies [Line Items]
Number of demands entitled to holders | Demand								3
Maximum [Member] | Merger Agreement [Member]
Commitments & contingencies [Line Items]
Reimbursable costs					$ 250,000			$ 250,000
Over-Allotment Units [Member]
Commitments & contingencies [Line Items]
Number of units issued (in shares) | shares				6,300,000
Underwriting cash discount per unit (in dollars per share) | $ / shares				$ 0.2
Underwriter cash discount				$ 9,700,000
Deferred commission per unit (in dollars per share) | $ / shares				$ 0.35
Common stock, share price (in dollars per share) | $ / shares				$ 10
Initial Public Offering [Member]
Commitments & contingencies [Line Items]
Number of units issued (in shares) | shares				48,300,000
Deferred underwriting commissions				$ 16,900,000
Common stock, share price (in dollars per share) | $ / shares				$ 10

Class A Ordinary Shares Subje_5

Class A Ordinary Shares Subject to Possible Redemption - Additional Information (Q3) (Details) - USD ($)			9 Months Ended		12 Months Ended	33 Months Ended
	Aug. 04, 2023	Jan. 11, 2023	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Sep. 30, 2023	Dec. 31, 2021
Temporary Equity [Line Items]
Cash withdrawn from Trust Account for working capital purposes			$ 1,230,308	$ 27,010	$ 43,317	$ 4,304,076
Common Class A [Member]
Temporary Equity [Line Items]
Temporary equity shares authorized (in shares)			500,000,000		500,000,000	500,000,000
Temporary equity par or stated value per share (in dollars per share)			$ 0.0001		$ 0.0001	$ 0.0001
Temporary equity, shares issued (in shares)			635,778		48,300,000	635,778	48,300,000
Temporary equity shares outstanding (in shares)			635,778		48,300,000	635,778	48,300,000
Number of shares redeemed (in shares)	282,624	47,381,598
Redemption amount	$ 2,942,664	$ 478,003,632

Class A Ordinary Shares Subje_6

Class A Ordinary Shares Subject to Possible Redemption - Summary Of Ordinary shares Issued Recognized in Class A (Q3) Ordinary Shares Subject To Possible Redemption (Q3) (Details) - USD ($)	9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Temporary Equity Disclosure [Abstract]
Class A ordinary shares subject to possible redemption	$ 487,168,822	$ 483,000,000	$ 483,000,000
Redemptions of Class A ordinary shares	(480,946,296)	$ 0
Increase in redemption value of Class A ordinary shares subject to possible redemption	135,254		4,168,822
Class A ordinary shares subject to possible redemption	$ 6,357,780		$ 487,168,822

Shareholders' Deficit - Preferr

Shareholders' Deficit - Preferred Stock Shares (Q3) (Details) - $ / shares	Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2021
Shareholders' (Deficit) Equity [Abstract]
Preferred shares, shares authorized (in shares)	5,000,000	5,000,000	5,000,000
Preferred stock, par value, (in dollars per share)	$ 0.0001	$ 0.0001	$ 0.0001
Preferred shares, shares issued (in shares)	0	0	0
Preferred shares, shares outstanding (in shares)	0	0	0

Shareholders' Deficit - Common

Shareholders' Deficit - Common Stock Shares (Q3) (Details)		9 Months Ended	12 Months Ended
	Jan. 30, 2021 shares	Sep. 30, 2023 Vote $ / shares shares	Dec. 31, 2022 VOTE Vote $ / shares shares	Dec. 31, 2021 $ / shares shares	Feb. 09, 2021 shares
Class of Stock [Line Items]
Stock conversion basis of Class B to Class A common stock at time of initial Business Combination		1
Class A Common Stock Not Subject to Redemption [Member]
Class of Stock [Line Items]
Common shares, shares authorized (in shares)		500,000,000	500,000,000	500,000,000
Common shares, par value (in dollars per share) | $ / shares		$ 0.0001	$ 0.0001	$ 0.0001
Common shares, votes per share		1	1
Common shares, shares issued (in shares)		635,778	48,300,000	48,300,000
Common shares, shares outstanding (in shares)		635,778	48,300,000	48,300,000
Class B Common Stock [Member]
Class of Stock [Line Items]
Common shares, shares authorized (in shares)		50,000,000	50,000,000	50,000,000
Common shares, par value (in dollars per share) | $ / shares		$ 0.0001	$ 0.0001	$ 0.0001
Common shares, votes per share | Vote			1
Common shares, shares issued (in shares)		12,075,000	12,075,000	12,075,000	10,062,500
Common shares, shares outstanding (in shares)	12,075,000	12,075,000	12,075,000	12,075,000	10,062,500
Stock split ratio	1.2
Shares subject to forfeiture (in shares)	1,575,000
Percentage of issued and outstanding shares after the Initial Public Offering collectively held by initial stockholders		20%	20%
Adjustment one of redemption price of stock based on market value and newly issued price (as a percent)	20%

Derivative Warrant Liabilitie_3

Derivative Warrant Liabilities (Q3) (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2023 d Item $ / shares shares	Dec. 31, 2022 Day item $ / shares shares	Dec. 31, 2021 shares	Feb. 09, 2021 $ / shares	Dec. 31, 2020 shares
Private Placement Warrants [Member]
Class of Warrant or Right [Line Items]
Warrant outstanding (in shares) | shares	8,216,330	8,216,330	8,216,330		0
Exercise price of warrants (in dollars per share)		$ 11.5		$ 11.5
Restrictions on transfer period of time after business combination completion	30 days	30 days
Public Warrant [Member]
Class of Warrant or Right [Line Items]
Warrant outstanding (in shares) | shares	9,660,000	9,660,000			0
Warrant exercise period condition one	30 days	30 days
Warrant exercise period condition two	12 months	12 months
Public Warrants expiration term	5 years	5 years
Threshold period for filling registration statement after business combination	20	20
Maximum threshold period for registration statement to become effective after business combination	60	60
Exercise price of warrants (in dollars per share)	$ 11.5	$ 11.5
Share price (in dollars per share)	$ 9.2	$ 9.2
Threshold trading days for redemption of public warrants	20	20
Threshold consecutive trading days for redemption of public warrants	10	10
Percentage of gross new proceeds to total equity proceeds used to measure dilution of warrant	60	60
Public Warrant [Member] | Redemption of Warrants When the Price per Class A Ordinary Share Equals or Exceeds $18.00 [Member]
Class of Warrant or Right [Line Items]
Class of warrants exercise price adjustment percentage	115%	115%
Warrant redemption condition minimum share price (in dollars per share)	$ 18	$ 18
Redemption price per public warrant (in dollars per share)	$ 0.01	$ 0.01
Threshold trading days for redemption of public warrants	20	20
Threshold consecutive trading days for redemption of public warrants	30	30
Redemption period	30 days	30 days
Share price trigger used to measure dilution of warrant (in dollars per share)	$ 18	$ 18
Public Warrant [Member] | Redemption of Warrants When the Price per Class A Ordinary Share Equals or Exceeds $10.00 [Member]
Class of Warrant or Right [Line Items]
Class of warrants exercise price adjustment percentage	180%	180%
Warrant redemption condition minimum share price (in dollars per share)	$ 10	$ 10
Warrant redemption condition minimum share price scenario two (in dollars per share)	18	18
Redemption price per public warrant (in dollars per share)	$ 0.1	$ 0.1
Threshold trading days for redemption of public warrants	20	20
Threshold consecutive trading days for redemption of public warrants	30	30
Redemption period	30 days	30 days
Share price trigger used to measure dilution of warrant (in dollars per share)	$ 10	$ 10

Fair Value Measurements - Measu

Fair Value Measurements - Measured at Fair Value on a Recurring Basis (Q3) (Details) - USD ($)	9 Months Ended		12 Months Ended	33 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Sep. 30, 2023	Dec. 31, 2021
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	$ 2,323,923		$ 536,300	$ 2,323,923	$ 14,301,100
Fair value assets transfers	0		0
Cash withdrawn from Trust Account for working capital purposes	1,230,308	$ 27,010	43,317	4,304,076
Level 1 [Member]
Assets:
Cash and investments held in Trust Account					483,012,312
Level 1 [Member] | Cash [Member]
Assets:
Cash and investments held in Trust Account	6,655,195			6,655,195
Level 1 [Member] | Money Market Funds [Member]
Assets:
Cash and investments held in Trust Account			487,268,822
Level 1 [Member] | Public Warrant [Member]
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	1,255,800		289,800	1,255,800	7,728,000
Level 3 [Member] | Private Placement Warrants [Member]
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	$ 1,068,123		$ 246,500	$ 1,068,123	$ 6,573,100

Fair Value Measurements - Level

Fair Value Measurements - Level 3 Fair Value Measurements Inputs (Q3) (Details) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Fair Value Disclosures [Abstract]
Increase (decrease) in fair value of liabilities	$ 1.8	$ (13.8)	$ (9.5)
Share price [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Measurement Input	10.55	10.09	9.77
Volatility [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Measurement Input	0.067	0.069	0.153
Volatility [Member] | Level 3 [Member] | Working Capital Loan Option [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Embedded Derivative Liability, Measurement Input	0.067	0.069
Expected life of the options to convert [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Measurement Input	0.94	5.47	5.6
Expected life of the options to convert [Member] | Level 3 [Member] | Working Capital Loan Option [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Embedded Derivative Liability, Measurement Input	5.31	5.47
Risk-free rate [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Measurement Input	0.0547	0.0473	0.0132
Risk-free rate [Member] | Level 3 [Member] | Working Capital Loan Option [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Embedded Derivative Liability, Measurement Input	0.0555	0.0472
Dividend yield [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Measurement Input	0	0	0
Dividend yield [Member] | Level 3 [Member] | Working Capital Loan Option [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Embedded Derivative Liability, Measurement Input	0	0
Strike price of debt conversion [Member] | Level 3 [Member] | Working Capital Loan Option [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Embedded Derivative Liability, Measurement Input	1.5	1.5

Fair Value Measurements - Chang

Fair Value Measurements - Change in the Fair Value of the Warrant Liabilities (Q3) (Details) - Level 3 [Member] - USD ($)	3 Months Ended						12 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance			$ 246,500			$ 6,573,100	$ 6,573,100	$ 0
Change in fair value							(6,326,600)	(3,707,810)
Ending balance							246,500	6,573,100
Working Capital Loan Option [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance			0			0	0
Initial fair value of Working Capital Loan Option							7,885
Change in fair value							(7,885)
Ending balance	$ 0						0	0
Private Placement Warrants [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	904,618	$ 1,191,368	246,500	$ 657,300	$ 3,626,700	6,573,100	6,573,100	0
Change in fair value	163,505	(286,750)	944,868	320,400	(2,969,400)	(2,946,400)	(6,326,600)	(4,368,130)
Ending balance	$ 1,068,123	$ 904,618	$ 1,191,368	$ 977,700	$ 657,300	$ 3,626,700	$ 246,500	$ 6,573,100

Subsequent Events (Q3) (Details

Subsequent Events (Q3) (Details)	Dec. 15, 2023 USD ($) DirectorNominees Director shares	Dec. 14, 2023 USD ($)	Sep. 30, 2023 USD ($)	Aug. 04, 2023 USD ($)	Dec. 31, 2022 USD ($)
Business Combination Agreement [Abstract]
Minimum net tangible assets upon consummation of merger			$ 5,000,001	$ 5,000,001	$ 5,000,001
Merger Agreement [Member] | Subsequent Event [Member]
Business Combination Agreement [Abstract]
Closing date purchase price	$ 400,000,000
Minimum investment amount	$ 30,000,000	$ 40,000,000
Percentage of premium on investment	10%
Number of directors | Director	9
Number of director nominees | DirectorNominees	6
Number of directors designated by acquiree | Director	5
Number of director designated by acquirer | Director	1
Number of directors nominees designated by acquiree | DirectorNominees	3
Merger Agreement [Member] | Minimum [Member] | Subsequent Event [Member]
Business Combination Agreement [Abstract]
Minimum net tangible assets upon consummation of merger	$ 5,000,001
Merger Agreement [Member] | Maximum [Member] | Subsequent Event [Member]
Business Combination Agreement [Abstract]
Maximum capital raise of closing date purchase price	$ 15,000,000
Number of shares issuable per warrant (in shares) | shares	0.075
Mr. Vazquez [Member] | Merger Agreement [Member] | Subsequent Event [Member]
Business Combination Agreement [Abstract]
Number of shares available for exercise after merger (in shares) | shares	68,966

Description of Organization a_4

Description of Organization and Business Operations (FY) (Details)			9 Months Ended	12 Months Ended
	Feb. 09, 2021 USD ($) $ / shares shares	Oct. 14, 2020 Business	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($)	Aug. 04, 2023 USD ($)
Subsidiary, Sale of Stock [Line Items]
Condition for future business combination number of businesses minimum | Business		1
Deferred underwriting commission			$ 250,000	$ 250,000	$ 250,000
Proceeds from issuance initial public offering				0	483,000,000
Proceeds received from private placement				$ 0	12,324,495
Threshold minimum aggregate fair market value as a percentage of the net assets held in the Trust Account			80%	80%
Threshold percentage of outstanding voting securities of the target to be acquired by post-transaction company to complete business combination			50%	50%
Minimum net tangible assets upon consummation of merger			$ 5,000,001	$ 5,000,001		$ 5,000,001
Threshold percentage of Public Shares subject to redemption without the Company's prior written consent			15%	15%
Obligation to redeem Public Shares if entity does not complete a Business Combination (as a percent)			100%	100%
Redemption period upon closure			10 days	10 days
Maximum net interest to pay dissolution expenses			$ 100,000	$ 100,000
Cash operating bank account			310,838	22,339	93,599
Working capital			7,500,000	1,100,000
Aggregate purchase price			25,000	25,000
Loan from the Sponsor				0	30,212
Loans from working capital			850,000	$ 500,000	$ 0
Business combination closing date				May 09, 2023
Sponsor
Subsidiary, Sale of Stock [Line Items]
Loan from the Sponsor			$ 135,000	$ 135,000
Private Placement Warrants
Subsidiary, Sale of Stock [Line Items]
Sale of Private Placement Warrants (in shares) | shares	8,216,330			8,216,330
Price of warrant | $ / shares	$ 1.5			$ 1.5
Proceeds received from private placement	$ 12,300,000			$ 12,300,000
Initial Public Offering
Subsidiary, Sale of Stock [Line Items]
Underwriting commission	$ 16,900,000
Sale of units in initial public offering, less allocation of proceeds to Public Warrants (in shares) | shares	48,300,000
Deferred underwriting commission	$ 250,000
Purchase price, per unit (in dollars per share) | $ / shares	$ 10
Proceeds from issuance initial public offering	$ 483,000,000
Offering Costs	$ 27,100,000
Private Placement
Subsidiary, Sale of Stock [Line Items]
Sale of units in initial public offering, less allocation of proceeds to Public Warrants (in shares) | shares	483,000,000
Price of warrant | $ / shares	$ 1.5
Private Placement | Private Placement Warrants
Subsidiary, Sale of Stock [Line Items]
Sale of Private Placement Warrants (in shares) | shares	8,216,330
Price of warrant | $ / shares	$ 1.5
Proceeds received from private placement	$ 12,300,000
Over-Allotment Units
Subsidiary, Sale of Stock [Line Items]
Sale of units in initial public offering, less allocation of proceeds to Public Warrants (in shares) | shares	6,300,000
Purchase price, per unit (in dollars per share) | $ / shares	$ 10

Summary of Significant Accoun_9

Summary of Significant Accounting Policies (FY) (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022	Jul. 27, 2022	Jan. 19, 2022	Dec. 31, 2021
Cash equivalents	$ 0	$ 0			$ 0
FDIC Insurance coverage amount	250,000	250,000
Unrecognized tax benefits	0	0			0
Unrecognized tax benefits accrued for interest and penalties	$ 0	$ 0			$ 0
Anti-dilutive securities attributable to warrants (in shares)	17,876,330	17,876,330
Net asset value per share	$ 1	$ 1
Working Capital Convertible Debt [Member]
Embedded Derivative, Fair Value of Embedded Derivative Liability	$ 0	$ 500,000
Sponsor [Member] | Working Capital Convertible Debt [Member]
Debt Instrument, Face Amount				$ 500,000
Debt Instrument Convertible Into Equity Related Warrants				$ 500,000
Debt Instrument, Convertible, Conversion Price			$ 1.5	$ 1.5
Class A ordinary Shares Subject to Possible Redemption
Class A ordinary shares subject to possible redemption (in shares)	635,778	48,300,000			48,300,000

Summary of Significant Accou_10

Summary of Significant Accounting Policies - Summary of Class A Ordinary Shares Subject to Possible Redemption is Excluded from Earning Per Share (FY) (Details) - USD ($)	3 Months Ended						9 Months Ended		12 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Numerator:
Allocation of net income (loss)	$ (1,746,564)	$ (3,248,492)	$ (2,780,733)	$ 1,186,825	$ 6,684,896	$ 5,775,190	$ (7,775,789)	$ 13,646,911	$ 15,876,077	$ 6,977,619
Denominator:
Weighted average common shares outstanding, Basic									12,075,000	11,906,712
Weighted average common shares outstanding, Diluted									12,075,000	11,906,712
Basic net income per ordinary share									$ 0.26	$ 0.13
Diluted net income per ordinary share									$ 0.26	$ 0.13
Class A Common Stock
Numerator:
Allocation of net income (loss)	$ (101,278)			$ 949,460			$ (1,450,300)	$ 10,917,529	$ 12,700,862	$ 5,468,324
Denominator:
Weighted average common shares outstanding, Basic	743,298			48,300,000			2,768,541	48,300,000	48,300,000	43,139,178
Weighted average common shares outstanding, Diluted	743,298			48,300,000			2,768,541	48,300,000	48,300,000	43,139,178
Basic net income per ordinary share	$ (0.14)			$ 0.02			$ (0.52)	$ 0.23	$ 0.26	$ 0.13
Diluted net income per ordinary share	$ (0.14)			$ 0.02			$ (0.52)	$ 0.23	$ 0.26	$ 0.13
Class B Common Stock
Numerator:
Allocation of net income (loss)	$ (1,645,286)			$ 237,365			$ (6,325,489)	$ 2,729,382	$ 3,175,215	$ 1,509,295
Denominator:
Weighted average common shares outstanding, Basic	12,075,000			12,075,000			12,075,000	12,075,000	12,075,000	11,906,712
Weighted average common shares outstanding, Diluted	12,075,000			12,075,000			12,075,000	12,075,000	12,075,000	11,906,712
Basic net income per ordinary share	$ (0.14)			$ 0.02			$ (0.52)	$ 0.23	$ 0.26	$ 0.13
Diluted net income per ordinary share	$ (0.14)			$ 0.02			$ (0.52)	$ 0.23	$ 0.26	$ 0.13

Initial Public Offering (FY) (D

Initial Public Offering (FY) (Details) - USD ($)		12 Months Ended
	Feb. 09, 2021	Dec. 31, 2022	Dec. 31, 2021	Sep. 30, 2023
Subsidiary, Sale of Stock [Line Items]
Proceeds received from initial public offering, gross		$ 0	$ 483,000,000
Offering costs		0	9,810,697
Deferred underwriting commissions		16,905,000	16,905,000	$ 6,762,000
Deferred legal fees		$ 0	$ 250,000
Public Warrant
Subsidiary, Sale of Stock [Line Items]
Exercise price of warrants		$ 11.5		$ 11.5
Initial Public Offering
Subsidiary, Sale of Stock [Line Items]
Number of units issued (in shares)	48,300,000
Purchase price, per unit (in dollars per share)	$ 10
Proceeds received from initial public offering, gross	$ 483,000,000
Offering costs	27,100,000
Deferred underwriting commissions	16,900,000
Deferred legal fees	$ 250,000
Initial Public Offering | Public Warrant
Subsidiary, Sale of Stock [Line Items]
Number of shares in a unit	1
Number of warrants in a unit	0.2
Number of shares issuable per warrant	1
Exercise price of warrants	$ 11.5
Over-Allotment Units
Subsidiary, Sale of Stock [Line Items]
Number of units issued (in shares)	6,300,000
Purchase price, per unit (in dollars per share)	$ 10

Related Party Transactions - _2

Related Party Transactions - Founder Shares (FY) (Details)		1 Months Ended	9 Months Ended	12 Months Ended
	Jan. 30, 2021 shares	Dec. 31, 2020 USD ($) shares	Sep. 30, 2023 USD ($) d $ / shares shares	Dec. 31, 2022 USD ($) Day $ / shares shares	Dec. 31, 2021 shares	Feb. 09, 2021 shares
Related Party Transaction [Line Items]
Aggregate purchase price | $			$ 25,000	$ 25,000
Class B Common Stock
Related Party Transaction [Line Items]
Stock split ratio	1.2
Common shares, shares outstanding (in shares)	12,075,000		12,075,000	12,075,000	12,075,000	10,062,500
Shares subject to forfeiture	1,575,000
Percentage of issued and outstanding shares after the Initial Public Offering collectively held by initial stockholders			20%	20%
Founder Shares | Sponsor | Class B Common Stock
Related Party Transaction [Line Items]
Aggregate purchase price | $		$ 25,000
Number of shares issued		10,062,500
Stock split ratio	1.2	1.2
Common shares, shares outstanding (in shares)	12,075,000
Shares subject to forfeiture	1,575,000
Percentage of issued and outstanding shares after the Initial Public Offering collectively held by initial stockholders	20%
Shares no longer subject to forfeiture						1,575,000
Stock price trigger to transfer, assign or sell any shares or warrants of the company, after the completion of the initial business combination (in dollars per share) | $ / shares			$ 12	$ 12
Threshold trading days for transfer, assign or sale of shares or warrants, after the completion of the initial business combination			20	20
Threshold consecutive trading days for transfer, assign or sale of shares or warrants, after the completion of the initial business combination			30	30
Threshold period after the business combination in which the 20 trading days within any 30 trading day period commences			150 days	150 days

Related Party Transactions - _3

Related Party Transactions - Additional Information (FY) (Details) - USD ($)			3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 19, 2022	Feb. 09, 2021	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Jul. 27, 2022	Dec. 31, 2020
Related Party Transaction [Line Items]
Proceeds received from issuance of warrants							$ 0	$ 12,324,495
Selling, General, and Administrative Expenses, Related Party, Type [Extensible Enumeration]							Related Party [Member]	Related Party [Member]
Bank Overdrafts			$ 850,000		$ 850,000		$ 500,000
Carrying value and principal value of loan			$ 850,000		$ 850,000		$ 500,000	$ 0
Notes Payable, Noncurrent, Related Party, Type [Extensible Enumeration]			Related Party [Member]		Related Party [Member]		Related Party [Member]	Related Party [Member]
Sponsor [Member]
Related Party Transaction [Line Items]
Proceeds from Notes Payable	$ 500,000				$ 500,000		$ 500,000
Sponsor [Member] | Embedded Derivative On Working Capital Loans [Member]
Related Party Transaction [Line Items]
Initial fair value of Working Capital Loan Option	7,900
Interest Expense			$ 0	$ 2,500	$ 0	$ 6,600	8,000
Advisor [Member]
Related Party Transaction [Line Items]
Cash							500,000
Common stock							$ 250,000
Private Placement Warrants
Related Party Transaction [Line Items]
Number of warrants issued (in shares)		8,216,330					8,216,330
Proceeds received from issuance of warrants		$ 12,300,000					$ 12,300,000
Exercise price of warrants		$ 11.5					$ 11.5
Period after completion of initial business combination					30 days		30 days
Price of warrant		$ 1.5					$ 1.5
Administrative Services Agreement
Related Party Transaction [Line Items]
Expenses per month					$ 20,000		$ 20,000
Expenses incurred and paid			$ 60,000	$ 60,000	$ 180,000	$ 180,000	240,000	$ 220,000
Selling, General, and Administrative Expenses, Related Party, Type [Extensible Enumeration]			Related Party [Member]	Related Party [Member]	Related Party [Member]	Related Party [Member]
Accrued expenses - related party							120,000	$ 0
Related Party Loans
Related Party Transaction [Line Items]
Maximum borrowing capacity of related party promissory note										$ 300,000
Related Party Loans | Promissory Note [Member]
Related Party Transaction [Line Items]
Debt Instrument, Face Amount			$ 350,000		$ 350,000		0
Related Party Loans | Promissory Note [Member] | Sponsor [Member]
Related Party Transaction [Line Items]
Loan conversion agreement warrant									$ 1,500,000
Price of warrant									$ 1.5
Debt Instrument, Face Amount									$ 475,000
Related Party Loans | Promissory Note [Member] | Sponsor [Member] | Warrant [Member]
Related Party Transaction [Line Items]
Loan conversion agreement warrant									$ 1,500,000
Price of warrant									$ 1.5
Related Party Loans | Working capital loans warrant
Related Party Transaction [Line Items]
Loan conversion agreement warrant			$ 1,500,000		$ 1,500,000		$ 1,500,000
Price of warrant			$ 1.5		$ 1.5		$ 1.5
Working Capital Convertible Debt [Member] | Sponsor [Member]
Related Party Transaction [Line Items]
Debt Instrument, Face Amount	$ 500,000
Debt Instrument, Convertible, Conversion Price	$ 1.5								$ 1.5

Commitments & Contingencies (_3

Commitments & Contingencies (FY) (Details) - USD ($)		12 Months Ended
	Feb. 09, 2021	Dec. 31, 2022	Sep. 30, 2023	Dec. 31, 2021
Commitments & contingencies [Line Items]
Granted Term	45 days
Underwriting cash discount per unit		$ 0.2
Underwriter cash discount		$ 9,700,000
Deferred commission per unit		$ 0.35
Deferred underwriting commissions		$ 16,905,000	$ 6,762,000	$ 16,905,000
Over-Allotment Units
Commitments & contingencies [Line Items]
Number of units issued (in shares)	6,300,000
Underwriting cash discount per unit	$ 0.2
Underwriter cash discount	$ 9,700,000
Deferred commission per unit	$ 0.35
Initial Public Offering
Commitments & contingencies [Line Items]
Number of units issued (in shares)	48,300,000
Deferred underwriting commissions	$ 16,900,000

Class A Ordinary Shares Subje_7

Class A Ordinary Shares Subject to Possible Redemption - Summary Of Ordinary shares Issued Recognized in Class A Ordinary Shares Subject To Possible Redemption (FY) (Details) - USD ($)	Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2021
Temporary Equity Disclosure [Abstract]
Gross Proceeds			$ 483,000,000
Offering costs allocated to Class A shares subject to possible redemption			(26,406,165)
Proceeds allocated to Public Warrants at issuance			(12,863,680)
Accrection on Class A ordinary shares subject to possible redemption amount			39,269,845
Increase in redemption value of Class A ordinary shares subject to possible redemption		$ 4,168,822
Class A ordinary shares subject to possible redemption	$ 6,357,780	$ 487,168,822	$ 483,000,000

Class A Ordinary Shares Subje_8

Class A Ordinary Shares Subject to Possible Redemption - Additional Information (FY) (Details) - Class A Common Stock - $ / shares	Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2021
Temporary Equity [Line Items]
Temporary equity shares authorized	500,000,000	500,000,000
Temporary equity par or stated value per share	$ 0.0001	$ 0.0001
Temporary equity shares outstanding (in shares)	635,778	48,300,000	48,300,000
Temporary Equity, Shares Issued	635,778	48,300,000	48,300,000

Shareholders' (Deficit) Equit_2

Shareholders' (Deficit) Equity - Preferred Stock Shares (FY) (Details) - $ / shares	Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2021
Shareholders' (Deficit) Equity [Abstract]
Preferred stock, shares authorized	5,000,000	5,000,000	5,000,000
Preferred stock, par value (per share)	$ 0.0001	$ 0.0001	$ 0.0001
Preferred stock, shares issued	0	0	0
Preferred stock, shares outstanding	0	0	0

Shareholders' (Deficit) Equit_3

Shareholders' (Deficit) Equity - Common Stock Shares (FY) (Details)		9 Months Ended	12 Months Ended
	Jan. 30, 2021 shares	Sep. 30, 2023 Vote $ / shares shares	Dec. 31, 2022 VOTE Vote $ / shares shares	Dec. 31, 2021 $ / shares shares	Feb. 09, 2021 shares
Class A Common Stock Not Subject to Redemption
Class of Stock [Line Items]
Common shares, shares authorized (in shares)		500,000,000	500,000,000	500,000,000
Common shares, par value (in dollars per share) | $ / shares		$ 0.0001	$ 0.0001	$ 0.0001
Common shares, votes per share		1	1
Common shares, shares issued (in shares)		635,778	48,300,000	48,300,000
Common shares, shares outstanding (in shares)		635,778	48,300,000	48,300,000
Class B Common Stock
Class of Stock [Line Items]
Common shares, shares authorized (in shares)		50,000,000	50,000,000	50,000,000
Common shares, par value (in dollars per share) | $ / shares		$ 0.0001	$ 0.0001	$ 0.0001
Common shares, votes per share | Vote			1
Common shares, shares issued (in shares)		12,075,000	12,075,000	12,075,000	10,062,500
Common shares, shares outstanding (in shares)	12,075,000	12,075,000	12,075,000	12,075,000	10,062,500
Stock split ratio	1.2
Shares subject to forfeiture	1,575,000
Percentage of issued and outstanding shares after the Initial Public Offering collectively held by initial stockholders		20%	20%
Adjustment one of redemption price of stock based on market value and newly issued price (as a percent)	20%

Derivative Warrant Liabilitie_4

Derivative Warrant Liabilities (FY) (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2023 d Item $ / shares shares	Dec. 31, 2022 Day item $ / shares shares	Dec. 31, 2021 shares	Feb. 09, 2021 $ / shares	Dec. 31, 2020 shares
Private Placement Warrants
Class of Warrant or Right [Line Items]
Warrant outstanding | shares	8,216,330	8,216,330	8,216,330		0
Exercise price of warrants		$ 11.5		$ 11.5
Restrictions on transfer period of time after business combination completion	30 days	30 days
Public Warrant
Class of Warrant or Right [Line Items]
Warrant outstanding | shares	9,660,000	9,660,000			0
Warrant exercise period condition one	30 days	30 days
Warrant exercise period condition two	12 months	12 months
Public Warrants expiration term	5 years	5 years
Threshold period for filling registration statement after business combination	20	20
Maximum threshold period for registration statement to become effective after business combination	60	60
Exercise price of warrants	$ 11.5	$ 11.5
Share price	$ 9.2	$ 9.2
Threshold trading days for redemption of public warrants	20	20
Threshold consecutive trading days for redemption of public warrants	10	10
Percentage of gross new proceeds to total equity proceeds used to measure dilution of warrant	60	60
Public Warrant | Redemption of Warrants When the Price per Class A Ordinary Share Equals or Exceeds $18.00
Class of Warrant or Right [Line Items]
Class of warrants exercise price adjustment percentage	115%	115%
Warrant redemption condition minimum share price	$ 18	$ 18
Redemption price per public warrant (in dollars per share)	$ 0.01	$ 0.01
Threshold trading days for redemption of public warrants	20	20
Threshold consecutive trading days for redemption of public warrants	30	30
Redemption period	30 days	30 days
Share price trigger used to measure dilution of warrant	$ 18	$ 18
Public Warrant | Redemption of Warrants When the Price per Class A Ordinary Share Equals or Exceeds $10.00
Class of Warrant or Right [Line Items]
Class of warrants exercise price adjustment percentage	180%	180%
Warrant redemption condition minimum share price	$ 10	$ 10
Warrant redemption condition minimum share price scenario two	18	18
Redemption price per public warrant (in dollars per share)	$ 0.1	$ 0.1
Threshold trading days for redemption of public warrants	20	20
Threshold consecutive trading days for redemption of public warrants	30	30
Redemption period	30 days	30 days
Share price trigger used to measure dilution of warrant	$ 10	$ 10

Fair Value Measurements (FY) (D

Fair Value Measurements (FY) (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2021
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	$ 2,323,923	$ 536,300	$ 14,301,100
Fair value assets level 1 to level 2 transfers		0	0
Fair value assets level 2 to level 1 transfers		0	0
Fair value assets transferred into (out of) level 3	0	0
Level 1
Assets:
Investments held in Trust Account			483,012,312
Level 1 | Money Market Funds [Member]
Assets:
Investments held in Trust Account		487,268,822
Level 1 | Public Warrant
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	1,255,800	289,800	7,728,000
Level 3 | Private Placement Warrants
Liabilities, Fair Value Disclosure [Abstract]
Derivative liabilities	$ 1,068,123	$ 246,500	$ 6,573,100

Fair Value Measurements - Lev_2

Fair Value Measurements - Level 3 Fair Value Measurements Inputs (FY) (Details) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Decrease in fair value of liabilities	$ 1.8	$ (13.8)	$ (9.5)
Stock price | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Measurement Input	10.55	10.09	9.77
Volatility | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Measurement Input	0.067	0.069	0.153
Volatility | Level 3 | Working Capital Loan Option [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Embedded Derivative Liability, Measurement Input	0.067	0.069
Expected life of the options to convert | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Measurement Input	0.94	5.47	5.6
Expected life of the options to convert | Level 3 | Working Capital Loan Option [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Embedded Derivative Liability, Measurement Input	5.31	5.47
Risk-free rate | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Measurement Input	0.0547	0.0473	0.0132
Risk-free rate | Level 3 | Working Capital Loan Option [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Embedded Derivative Liability, Measurement Input	0.0555	0.0472
Dividend yield | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Measurement Input	0	0	0
Dividend yield | Level 3 | Working Capital Loan Option [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Embedded Derivative Liability, Measurement Input	0	0
Strike price of debt conversion | Level 3 | Working Capital Loan Option [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Embedded Derivative Liability, Measurement Input	1.5	1.5

Fair Value Measurements - Cha_2

Fair Value Measurements - Change in the Fair Value of the Warrant Liabilities (FY) (Details) - USD ($)	3 Months Ended						12 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]							Derivative, Gain (Loss) on Derivative, Net
Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance			$ 246,500			$ 6,573,100	$ 6,573,100	$ 0
Issuance of Public and Private Warrants								23,804,910
Transfer of Public Warrants to Level 1								(13,524,000)
Change in fair value of derivative warrant liabilities							(6,326,600)	(3,707,810)
Ending balance							246,500	6,573,100
Level 3 | Working Capital Loan Option [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance			0			0	0
Change in fair value of derivative warrant liabilities							(7,885)
Initial fair value of the Working Capital Loan Option							7,885
Ending balance	$ 0						0	0
Level 3 | Public Warrant
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance			0			0	0	0
Issuance of Public and Private Warrants								12,863,680
Transfer of Public Warrants to Level 1								(13,524,000)
Change in fair value of derivative warrant liabilities							0	660,320
Ending balance							0	0
Level 3 | Private Placement Warrants
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	904,618	$ 1,191,368	246,500	$ 657,300	$ 3,626,700	6,573,100	6,573,100	0
Issuance of Public and Private Warrants								10,941,230
Transfer of Public Warrants to Level 1								0
Change in fair value of derivative warrant liabilities	163,505	(286,750)	944,868	320,400	(2,969,400)	(2,946,400)	(6,326,600)	(4,368,130)
Ending balance	$ 1,068,123	$ 904,618	$ 1,191,368	$ 977,700	$ 657,300	$ 3,626,700	$ 246,500	$ 6,573,100

Subsequent Events - Additional

Subsequent Events - Additional Information (FY) (Details)	Aug. 04, 2023 USD ($) shares	Jan. 11, 2023 USD ($) Integer shares	Sep. 30, 2023 USD ($) shares	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($) shares
Notes Payable, Noncurrent | $			$ 850,000		$ 500,000	$ 0
Common Class A [Member]
Stock Redeemed or Called During Period, Shares | shares	282,624	47,381,598
Stock Redeemed or Called During Period, Value | $	$ 2,942,664	$ 478,003,632
Temporary Equity, Shares Outstanding | shares			635,778		48,300,000	48,300,000
Subsequent Event [Member]
Number of Shareholders Elected to Redeem Shares | Integer		260
Subsequent Event [Member] | July Two Thousand and Twenty Two Note [Member]
Notes Payable, Noncurrent | $				$ 250,000
Subsequent Event [Member] | Common Class A [Member]
Stock Redeemed or Called During Period, Shares | shares		47,381,598
Percentage of Stock Redeemed of Issued and Outstanding		98.10%
Stock Redeemed or Called During Period, Value | $		$ 478,003,632
Temporary Equity, Shares Outstanding | shares		918,402