Spire Missouri 10-Q 25 Apr 23 2023 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	3 Months Ended
	Dec. 31, 2022	Jan. 27, 2023
Document Information [Line Items]
Entity Central Index Key	0000057183
Entity Registrant Name	Spire Missouri Inc.
Amendment Flag	false
Current Fiscal Year End Date	--09-30
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2023
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Dec. 31, 2022
Document Transition Report	false
Entity File Number	1-1822
Entity Address, Address Line One	700 Market Street
Entity Address, City or Town	St. Louis
Entity Address, State or Province	MO
Entity Address, Postal Zip Code	63101
City Area Code	314
Local Phone Number	342-0500
Entity Incorporation, State or Country Code	MO
Entity Tax Identification Number	43-0368139
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		25,325
Spire Alabama Inc [Member]
Document Information [Line Items]
Entity Central Index Key	0000003146
Entity Registrant Name	Spire Alabama Inc.
Amendment Flag	false
Current Fiscal Year End Date	--09-30
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2023
Entity File Number	2-38960
Entity Address, Address Line One	605 Richard Arrington Blvd N
Entity Address, City or Town	Birmingham
Entity Address, State or Province	AL
Entity Address, Postal Zip Code	35203
City Area Code	205
Local Phone Number	326-8100
Entity Incorporation, State or Country Code	AL
Entity Tax Identification Number	63-0022000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		1,972,052
Depositary Shares [Member]
Document Information [Line Items]
Title of 12(b) Security	Depositary Shares
Trading Symbol	SR.PRA
Security Exchange Name	NYSE
Common Stock [Member]
Document Information [Line Items]
Title of 12(b) Security	Common Stock $1.00 par value
Trading Symbol	SR
Security Exchange Name	NYSE

Condensed Consolidated Statemen

Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions		3 Months Ended
		Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Operating Revenues		$ 814	$ 814	$ 555.4	$ 555.4
Operating Expenses:
Natural gas		419.2	419.2	249.2	249.2
Operation and maintenance		132.1	132.1	116.4	116.4
Depreciation and amortization		62.1	62.1	56.9	56.9
Taxes, other than income taxes		50.4	50.4	37.6	37.6
Total Operating Expenses		663.8	663.8	460.1	460.1
Operating Income		150.2	150.2	95.3	95.3
Interest Expense, Net			43.6		28.6
Other Income, Net			6		7.4
Income Before Income Taxes			112.6		74.1
Income Tax Expense			21.6		18.4
Net Income		91	91	55.7	55.7
Provision for preferred dividends		3.7	3.7	3.7	3.7
Income allocated to participating securities		0.1	0.1	0.1	0.1
Net Income Available to Common Shareholders		87.2	87.2	51.9	51.9
Other Comprehensive Income, Net of Tax		(2.4)		(3.9)
Comprehensive Income		88.6		51.8
Operating Revenues		$ 814	$ 814	$ 555.4	$ 555.4
Weighted Average Number of Common Shares Outstanding:
Basic (in shares)		52.4	52.4	51.6	51.6
Diluted (in shares)		52.6	52.6	51.7	51.7
Basic Earnings Per Common Share (in dollars per share)		$ 1.66	$ 1.66	$ 1.01	$ 1.01
Diluted Earnings Per Common Share (in dollars per share)		$ 1,660,000	$ 1.66	$ 1,010,000	$ 1.01
Operating Revenues		$ 814	$ 814	$ 555.4	$ 555.4
Spire Missouri [Member]
Operating Revenues		541.2		347.9
Operating Expenses:
Natural gas		316.7		156.3
Operation and maintenance		77.1		66.3
Depreciation and amortization		38.6		34.2
Taxes, other than income taxes		36.4		25.7
Total Operating Expenses		468.8		282.5
Operating Income		72.4		65.4
Interest Expense, Net		22		14.5
Other Income, Net		5		5.9
Income Before Income Taxes		55.4		56.8
Income Tax Expense		8.1		11.5
Net Income	[1]	47.3		45.3
Other Comprehensive Income, Net of Tax	[1]	0.1		0.1
Comprehensive Income		47.4		45.4
Operating Revenues		541.2		347.9
Weighted Average Number of Common Shares Outstanding:
Operating Revenues		541.2		347.9
Spire Alabama Inc [Member]
Operating Revenues		152.4		126.6
Operating Expenses:
Natural gas		69.4		45.5
Operation and maintenance		35.1		34.5
Depreciation and amortization		17		16.5
Taxes, other than income taxes		10.6		9
Total Operating Expenses		132.1		105.5
Operating Income		20.3		21.1
Interest Expense, Net		8.3		5.1
Other Income, Net		0.4		0.4
Income Before Income Taxes		12.4		16.4
Income Tax Expense		3.2		4.2
Net Income		9.2		12.2
Operating Revenues		152.4		126.6
Weighted Average Number of Common Shares Outstanding:
Operating Revenues		$ 152.4		$ 126.6
[1]Accumulated other comprehensive income (loss)

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Net Income	$ 91	$ 55.7
Other Comprehensive Loss, Before Tax:
Net hedging loss arising during the period	(3)	(4.8)
Amounts reclassified into net income	(0.3)	(0.3)
Net loss on cash flow hedging derivative instruments	(3.3)	(5.1)
Net gain on defined benefit pension and other postretirement plans	0.1	0.1
Net unrealized loss on available for sale securities	0	(0.1)
Other Comprehensive Loss, Before Tax	(3.2)	(5.1)
Income Tax Benefit Related to Items of Other Comprehensive Loss	(0.8)	(1.2)
Other Comprehensive Loss, Net of Tax	(2.4)	(3.9)
Comprehensive Income	$ 88.6	$ 51.8

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Millions		Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
ASSETS
Utility Plant		$ 7,769.4	$ 7,664.9	$ 7,329.2
Less: Accumulated depreciation and amortization		2,326.5	2,294.5	2,204.4
Net Utility Plant		5,442.9	5,370.4	5,124.8
Non-utility Property (net of accumulated depreciation and amortization of $55.6, $50.7 and $36.7 at December 31, 2022, September 30, 2022, and December 31, 2021, respectively)		508.9	491.4	474.2
Other Investments		93.5	87.8	90.4
Total Other Property and Investments		602.4	579.2	564.6
Other Property and Investments		602.4	579.2	564.6
Current Assets:
Cash and cash equivalents		4.8	6.5	8.2
Utility		479.4	210.8	476.2
Other		334.7	443.8	304.2
Allowance for credit losses		(34.5)	(31.9)	(31.4)
Delayed customer billings		26.7	21.3	11.4
Accounts receivable:
Utility		479.4	210.8	476.2
Other		334.7	443.8	304.2
Allowance for credit losses		(34.5)	(31.9)	(31.4)
Delayed customer billings		26.7	21.3	11.4
Inventories:
Natural gas		320	371.8	284.8
Propane gas		8.6	8.6	8.7
Materials and supplies		44.1	41.9	32.1
Regulatory assets		269.1	355.4	265.7
Prepayments		31.6	41.1	25.5
Other current assets		145.2	122.7	49.9
Total Current Assets		1,629.7	1,592	1,435.3
Deferred Charges and Other Assets:
Goodwill		1,171.6	1,171.6	1,171.6
Regulatory assets		1,220.7	1,112.4	1,089.9
Other		260.4	258.1	264.3
Total Deferred Charges and Other Assets		2,652.7	2,542.1	2,525.8
Total Assets		10,327.7	10,083.7	9,650.5
Capitalization:
Preferred stock ($25.00 par value per share; 10.0 million depositary shares authorized, issued and outstanding at December 31, 2022, September 30, 2022, and December 31, 2021)		242	242	242
Common stock (par value $1.00 per share; 70.0 million shares authorized; 52.5 million, 52.5 million, and 51.7 million shares issued and outstanding at December 31, 2022, September 30, 2022, and December 31, 2021, respectively)		52.5	52.5	51.7
Paid-in capital		1,571.8	1,571.3	1,516.9
Retained earnings		953	905.5	859.5
Accumulated other comprehensive income (loss)		44.8	47.2	(0.3)
Total Shareholders' Equity		2,864.1	2,818.5	2,669.8
Temporary equity		16.2	13.1	9.8
Long-term debt (less current portion)		3,156.3	2,958.5	3,206.8
Total Capitalization		6,036.6	5,790.1	5,886.4
Current Liabilities:
Current portion of long-term debt		256.6	281.2	31.2
Notes payable		1,227	1,037.5	846
Accounts payable		506.8	617.4	427.5
Advance customer billings		16.9	18.7	31.3
Wages and compensation accrued		30.6	50.2	29.9
Customer deposits		28.8	28.2	29.4
Taxes accrued		57.6	90.1	47.2
Regulatory liabilities		3.7	3.7	4.1
Other current liabilities		276.7	226.6	274.1
Total Current Liabilities		2,404.7	2,353.6	1,720.7
Deferred Credits and Other Liabilities:
Deferred income taxes		699.4	675.1	615.6
Pension and postretirement benefit costs		159.3	163	222.5
Asset retirement obligations		526.2	520.9	524.8
Regulatory liabilities		344.9	418.2	531.8
Other noncurrent liabilities		156.6	162.8	148.7
Total Deferred Credits and Other Liabilities		1,886.4	1,940	2,043.4
Commitments and Contingencies (Note 10)
Total Capitalization and Liabilities		10,327.7	10,083.7	9,650.5
Spire Missouri [Member]
ASSETS
Utility Plant		4,632.6	4,550.4	4,347.8
Less: Accumulated depreciation and amortization		1,003.4	982.1	927.4
Net Utility Plant		3,629.2	3,568.3	3,420.4
Total Other Property and Investments		66.5	58.9	68.9
Other Property and Investments		66.5	58.9	68.9
Current Assets:
Utility		357.2	131.5	377.4
Associated companies		5.8	3.7	3.7
Other		28.6	44.5	36.3
Allowance for credit losses		(28.2)	(24.9)	(23.8)
Delayed customer billings		21.5	16.1	4.7
Accounts receivable:
Utility		357.2	131.5	377.4
Other		28.6	44.5	36.3
Allowance for credit losses		(28.2)	(24.9)	(23.8)
Delayed customer billings		21.5	16.1	4.7
Associated companies		5.8	3.7	3.7
Inventories:
Natural gas		189.9	215.3	186.6
Propane gas		8.6	8.6	8.7
Materials and supplies		23	22	16.2
Regulatory assets		191.2	288.1	236.9
Prepayments		15.8	23.3	18.4
Total Current Assets		813.4	728.2	865.1
Deferred Charges and Other Assets:
Goodwill		210.2	210.2	210.2
Regulatory assets		634.7	547.6	560.5
Other		106	105	126.2
Total Deferred Charges and Other Assets		950.9	862.8	896.9
Total Assets		5,460	5,218.2	5,251.3
Capitalization:
Retained earnings		979.2	931.9	862.3
Accumulated other comprehensive income (loss)		(2.6)	(2.7)	(4.1)
Total Shareholders' Equity	[1]	1,792.8	1,745.4	1,623.3
Long-term debt (less current portion)		1,388.1	1,387.7	1,637
Total Capitalization		3,180.9	3,133.1	3,260.3
Paid-in capital and common stock (par value $1.00 per share; 50.0 million shares authorized; 25,325, 25,325, and 24,577 shares issued and outstanding at December 31, 2022, September 30, 2022, and December 31, 2021, respectively)		816.2	816.2	765.1
Current Liabilities:
Current portion of long-term debt		250	250	0
Notes payable		0	0	250
Accounts payable		166.6	119	117
Advance customer billings		5.3	7	20
Wages and compensation accrued		21.5	33.8	21
Customer deposits		6.3	6.5	8
Taxes accrued		24.3	50.4	15.4
Regulatory liabilities		0	0	0.2
Other current liabilities		92.9	45.6	89.2
Total Current Liabilities		1,238.2	970.9	712.8
Notes payable – associated companies		651.2	445.3	180.4
Accounts payable – associated companies		20.1	13.3	11.6
Deferred Credits and Other Liabilities:
Deferred income taxes		512.4	500.1	477.5
Pension and postretirement benefit costs		101.9	115.5	147.9
Asset retirement obligations		111.7	110.6	144.8
Regulatory liabilities		259	331.8	447.2
Other noncurrent liabilities		55.9	56.2	60.8
Total Deferred Credits and Other Liabilities		1,040.9	1,114.2	1,278.2
Commitments and Contingencies (Note 10)
Total Capitalization and Liabilities		5,460	5,218.2	5,251.3
Spire Alabama Inc [Member]
ASSETS
Utility Plant		2,755.8	2,732.6	2,604.8
Less: Accumulated depreciation and amortization		1,196.5	1,184.1	1,137.9
Net Utility Plant		1,559.3	1,548.5	1,466.9
Current Assets:
Cash and cash equivalents		0	2.4	0
Utility		100.2	69.9	84.6
Associated companies		0.8	1.3	1.3
Other		5.4	6.5	7.5
Allowance for credit losses		(5.5)	(6.3)	(6.7)
Delayed customer billings		4.8	4.8	6.5
Accounts receivable:
Utility		100.2	69.9	84.6
Other		5.4	6.5	7.5
Allowance for credit losses		(5.5)	(6.3)	(6.7)
Delayed customer billings		4.8	4.8	6.5
Associated companies		0.8	1.3	1.3
Inventories:
Natural gas		66.1	72.5	44.7
Materials and supplies		17.2	16.3	12.8
Regulatory assets		67.3	56.9	14.6
Prepayments		4.1	5.8	3.6
Total Current Assets		260.4	230.1	168.9
Deferred Charges and Other Assets:
Regulatory assets		560.4	538.2	501.7
Other		81.7	81.3	63.2
Total Deferred Charges and Other Assets		649.9	630.5	594.9
Total Assets		2,469.6	2,409.1	2,230.7
Deferred income taxes		7.8	11	30
Capitalization:
Retained earnings		595.3	589.1	556.8
Total Shareholders' Equity		900.7	906	879.7
Long-term debt (less current portion)		745.6	571.5	571.3
Total Capitalization		1,646.3	1,477.5	1,451
Paid-in capital and common stock (par value $1.00 per share; 50.0 million shares authorized; 25,325, 25,325, and 24,577 shares issued and outstanding at December 31, 2022, September 30, 2022, and December 31, 2021, respectively)		305.4	316.9	322.9
Current Liabilities:
Accounts payable		87.1	85.6	58.1
Advance customer billings		9.7	9.9	10.2
Wages and compensation accrued		3.2	7.6	4.1
Customer deposits		19.7	19	18.8
Taxes accrued		28.8	31.3	27.3
Regulatory liabilities		0	0	0.8
Other current liabilities		20.7	22.4	19.4
Total Current Liabilities		319	441.1	316
Notes payable – associated companies		145.8	260.9	173.7
Accounts payable – associated companies		4	4.4	3.6
Deferred Credits and Other Liabilities:
Pension and postretirement benefit costs		51.4	40.5	65.1
Asset retirement obligations		402.8	398.7	366.4
Regulatory liabilities		22.2	23	25.3
Other noncurrent liabilities		27.9	28.3	6.9
Total Deferred Credits and Other Liabilities		504.3	490.5	463.7
Total Capitalization and Liabilities		$ 2,469.6	$ 2,409.1	$ 2,230.7
[1]Accumulated other comprehensive income (loss)

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Millions	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Non-utility property, accumulated depreciation and amortization	$ 55.6	$ 50.7	$ 36.7
Preferred stock, par value (in dollars per share)	$ 25	$ 25	$ 25
Common stock, par value (in dollars per share)	$ 1	$ 1	$ 1
Common stock, shares authorized (in shares)	70,000,000	70,000,000	70,000,000
Common stock, shares issued (in shares)	52,500,000	52,500,000	51,700,000
Common Stock, shares outstanding (in shares)	52,500,000	52,500,000	51,700,000
Depositary Shares [Member]
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	10,000,000	10,000,000	10,000,000
Preferred stock, shares outstanding (in shares)	10,000,000	10,000,000	10,000,000
Spire Missouri [Member]
Common stock, par value (in dollars per share)	$ 1	$ 1	$ 1
Common stock, shares authorized (in shares)	50,000,000	50,000,000	50,000,000
Common stock, shares issued (in shares)	25,325	25,325	24,577
Common Stock, shares outstanding (in shares)	25,325	25,325	24,577
Spire Alabama Inc [Member]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	3,000,000	3,000,000	3,000,000
Common stock, shares issued (in shares)	2,000,000	2,000,000	2,000,000
Common Stock, shares outstanding (in shares)	2,000,000	2,000,000	2,000,000

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Millions	Spire Missouri [Member] Common Stock [Member]	Spire Missouri [Member] Additional Paid-in Capital [Member]	Spire Missouri [Member] Retained Earnings [Member]	Spire Missouri [Member] AOCI Attributable to Parent [Member]	Spire Missouri [Member]	[1]	Spire Alabama Inc [Member] Common Stock [Member]	Spire Alabama Inc [Member] Additional Paid-in Capital [Member]	Spire Alabama Inc [Member] Retained Earnings [Member]	Spire Alabama Inc [Member]	Common Stock [Member]	Preferred Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]		Total
Balance (in shares) at Sep. 30, 2021	24,577						1,972,052				51,684,883
Balance at Sep. 30, 2021	$ 0.1	$ 765	$ 817	$ (4.2)	$ 1,577.9		$ 0	$ 328.9	$ 552.6	$ 881.5	$ 51.7	$ 242	$ 1,517.9	$ 843	$ 3.6	[1]	$ 2,658.2
Net Income	0	0	45.3	0	45.3		0	0	12.2	12.2	$ 0	0	0	55.7	0	[1]	55.7
Dividend reinvestment plan (in shares)											6,233
Dividend reinvestment plan											$ 0	0	0.4	0	0	[1]	0.4
Stock-based compensation costs											$ 0	0	0.3	0	0	[1]	0.3
Stock issued under stock-based compensation plans (in shares)											77,976
Stock issued under stock-based compensation plans											$ 0	0	0	0	0	[1]	0
Employees’ tax withholding for stock-based compensation (in shares)											(26,611)
Employees’ tax withholding for stock-based compensation											$ 0	0	(1.7)	0	0	[1]	(1.7)
Temporary equity adjustment to redemption value											0	0	0	0.1	0	[1]	0.1
Common stock dividends							$ 0	0	(8)	(8)	0	0	0	(35.6)	0	[1]	(35.6)
Preferred stock dividends											0	0	0	(3.7)	0	[1]	(3.7)
Other Comprehensive Income, Net of Tax	$ 0	0	0	0.1	0.1						$ 0	0	0	0	(3.9)		(3.9)
Balance (in shares) at Dec. 31, 2021	24,577						1,972,052				51,742,481
Balance at Dec. 31, 2021	$ 0.1	765	862.3	(4.1)	1,623.3		$ 0	322.9	556.8	879.7	$ 51.7	$ 242	1,516.9	859.5	(0.3)	[1]	2,669.8
Return of capital to Spire							$ 0	(6)	0	(6)
Balance (in shares) at Sep. 30, 2022	25,325						1,972,052				52,494,543	242
Balance at Sep. 30, 2022	$ 0.1	816.1	931.9	(2.7)	1,745.4		$ 0	316.9	589.1	906	$ 52.5		1,571.3	905.5	47.2	[1]	2,818.5
Net Income	0	0	47.3	0	47.3		0	0	9.2	9.2	$ 0		0	91	0	[1]	91
Dividend reinvestment plan (in shares)											5,700	0
Dividend reinvestment plan											$ 0		0.4	0	0	[1]	0.4
Stock-based compensation costs											$ 0		1.4	0	0	[1]	1.4
Stock issued under stock-based compensation plans (in shares)											58,678	0
Stock issued under stock-based compensation plans											$ 0		0	0	0	[1]	0
Employees’ tax withholding for stock-based compensation (in shares)											(17,225)	0
Employees’ tax withholding for stock-based compensation											$ 0		(1.3)	0	0	[1]	(1.3)
Temporary equity adjustment to redemption value											0		0	(1.7)	0	[1]	(1.7)
Common stock dividends							$ 0	0	(3)	(3)	0		0	(38.1)	0	[1]	(38.1)
Preferred stock dividends											0		0	(3.7)	0	[1]	(3.7)
Other Comprehensive Income, Net of Tax	$ 0	0	0	0.1	0.1						$ 0		0	0	(2.4)		(2.4)
Balance (in shares) at Dec. 31, 2022	25,325						1,972,052				52,541,696	242
Balance at Dec. 31, 2022	$ 0.1	$ 816.1	$ 979.2	$ (2.6)	$ 1,792.8		$ 0	305.4	595.3	900.7	$ 52.5		$ 1,571.8	$ 953	$ 44.8	[1]	$ 2,864.1
Return of capital to Spire							$ 0	$ (11.5)	$ 0	$ (11.5)
[1]Accumulated other comprehensive income (loss)

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Shareholders' Equity (Unaudited) (Parentheticals) - $ / shares	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Common stock, dividends per share declared (in dollars per share)	$ 0.72	$ 0.65
Preferred stock dividends per share declared (in dollars per share)	$ 0.36875	$ 0.36875

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions		3 Months Ended
		Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Operating Activities:
Net Income		$ 91	$ 91	$ 55.7	$ 55.7
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization		62.1		56.9
Deferred income taxes and investment tax credits		21.6		18.4
Changes in assets and liabilities:
Accounts receivable		(156.9)		(152.8)
Inventories		49.7		(20.5)
Regulatory assets and liabilities		(90.1)		(187.3)
Accounts payable		(96.7)		42.9
Delayed/advance customer billings, net		(7.2)		(2.9)
Taxes accrued		(32.1)		(31.4)
Other assets and liabilities		(15.6)		(9.6)
Other		3.4		0.7
Net cash used in operating activities		(170.8)		(229.9)
Delayed/advance customer billings, net		(7.2)		(2.9)
Investing Activities:
Capital expenditures		(154.8)		(145.7)
Other		3.1		2.6
Net cash used in investing activities		(151.7)		(143.1)
Financing Activities:
Issuance of long-term debt		205		300
Repayment of long-term debt		(31.2)		(55.8)
Issuance of short-term debt, net		189.5		174
Issuance of common stock		0.4		0.4
Dividends paid on common stock		(36.3)		(34.6)
Dividends paid on preferred stock		(3.7)		(3.7)
Other financing activities		(2.7)		(3.4)
Net cash provided by financing activities		321		376.9
Net (Decrease) Increase in Cash, Cash Equivalents, and Restricted Cash		(1.5)		3.9
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period		20.5		11.3
Cash, Cash Equivalents, and Restricted Cash at End of Period		19	20.5	15.2	11.3
Supplemental disclosure of cash paid for:
Interest, net of amounts capitalized		(36.9)		(23.3)
Income taxes		(0.3)		(0.2)
Spire Missouri [Member]
Operating Activities:
Net Income	[1]	47.3		45.3
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization		38.6		34.2
Deferred income taxes and investment tax credits		8.1		11.5
Changes in assets and liabilities:
Accounts receivable		(208.5)		(74.9)
Inventories		24.4		(11.1)
Regulatory assets and liabilities		(61.5)		(161.3)
Accounts payable		66.4		38.3
Delayed/advance customer billings, net		(7.1)		(2)
Taxes accrued		(26.2)		(25.8)
Other assets and liabilities		13.2		3.8
Other		0.4		0.2
Net cash used in operating activities		(104.9)		(141.8)
Delayed/advance customer billings, net		(7.1)		(2)
Investing Activities:
Capital expenditures		(102)		(96.3)
Other		1		0.4
Net cash used in investing activities		(101)		(95.9)
Financing Activities:
Issuance of long-term debt		0		300
Other financing activities		0		(1.7)
Net cash provided by financing activities		205.9		237.7
Net (Decrease) Increase in Cash, Cash Equivalents, and Restricted Cash		0		0
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period		0		0
Cash, Cash Equivalents, and Restricted Cash at End of Period		0	0	0	0
Borrowings from (repayments to) Spire, net		205.9		(60.6)
Supplemental disclosure of cash paid for:
Interest, net of amounts capitalized		(21)		(15.3)
Income taxes		0		0
Spire Alabama Inc [Member]
Operating Activities:
Net Income		9.2		12.2
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization		17		16.5
Deferred income taxes and investment tax credits		3.2		4.2
Changes in assets and liabilities:
Accounts receivable		(29.5)		(36.5)
Inventories		5.6		(11.1)
Regulatory assets and liabilities		(29.7)		(21.4)
Accounts payable		10.9		15.8
Delayed/advance customer billings, net		(0.1)		(0.9)
Taxes accrued		(2.5)		(3.2)
Other assets and liabilities		15.1		(2)
Other		0.1		(0.2)
Net cash used in operating activities		(0.7)		(26.6)
Delayed/advance customer billings, net		(0.1)		(0.9)
Investing Activities:
Capital expenditures		(38.2)		(34.7)
Other		0.1		0.6
Net cash used in investing activities		(38.1)		(34.1)
Financing Activities:
Issuance of long-term debt		175		0
Repayment of long-term debt		0		(50)
Dividends paid on common stock		(11)		(8)
Other financing activities		(1)		0
Net cash provided by financing activities		36.4		60.7
Net (Decrease) Increase in Cash, Cash Equivalents, and Restricted Cash		(2.4)		0
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period		2.4		0
Cash, Cash Equivalents, and Restricted Cash at End of Period		0	$ 2.4	0	$ 0
Borrowings from (repayments to) Spire, net		(115.1)		124.7
Return of capital to Spire		(11.5)		(6)
Supplemental disclosure of cash paid for:
Interest, net of amounts capitalized		(5.8)		(5.2)
Income taxes		$ 0		$ 0
[1]Accumulated other comprehensive income (loss)

Note 1 - Summary of Significant

Note 1 - Summary of Significant Accounting Policies	3 Months Ended
	Dec. 31, 2022
Notes to Financial Statements
Significant Accounting Policies [Text Block]	1. BASIS OF PRESENTATION The accompanying unaudited financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP) for interim financial information with the instructions to Form 10 10 01 not 10 10 September 30, 2022. The consolidated financial position, results of operations, and cash flows of Spire include the accounts of the Company and all its subsidiaries. Transactions and balances between consolidated entities have been eliminated from the consolidated financial statements of Spire. In compliance with GAAP, transactions between Spire Missouri and Spire Alabama and their affiliates, as well as intercompany balances on their balance sheets, have not Certain information is presented by reportable segment, as described below. Effective during the first 2023, NATURE OF OPERATIONS three Note 9 Nearly all the Company’s earnings are derived from its Gas Utility segment. Due to the seasonal nature of the Utilities’ business and the volumetric Spire Missouri rate design, earnings are typically concentrated during the heating season of November April not REGULATED OPERATIONS 980, Regulated Operations third may As authorized by the Missouri Public Service Commission (MoPSC), the Mississippi Public Service Commission (MSPSC) and the Alabama Public Service Commission (APSC), the Purchased Gas Adjustment (PGA) clauses and Gas Supply Adjustment (GSA) riders allow the Utilities to pass through to customers the cost of purchased gas supplies. Regulatory assets and liabilities related to the PGA clauses and the GSA riders are both labeled Unamortized Purchased Gas Adjustments herein. See additional information about regulatory assets and liabilities in Note 4 DERIVATIVES 815, Derivatives and Hedging not TRANSACTIONS WITH AFFILIATES Three Months Ended December 31, 2022 2021 Spire Missouri Purchases of natural gas from Spire Marketing Inc. $ 28.5 $ 18.2 Transportation services received from Spire STL Pipeline LLC 8.1 8.1 Spire Alabama Purchases of natural gas from Spire Marketing Inc. $ 1.1 $ — RESTRICTED CASH December 31, 2022, December 31, 2022 September 30, 2022, ACCRUED CAPITAL EXPENDITURES December 31, September 30, December 31, 2022 2022 2021 Spire $ 63.1 $ 77.8 $ 33.5 Spire Missouri 32.8 45.6 27.2 Spire Alabama 9.4 19.2 1.2 ACCOUNTS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES not Spire Spire Missouri Spire Alabama Three Months Ended December 31, 2022 2021 2022 2021 2022 2021 Allowance at beginning of period $ 31.9 $ 30.3 $ 24.9 $ 22.6 $ 6.3 $ 6.6 Provision for expected credit losses 4.1 1.5 3.8 2.1 0.2 (0.5 ) Write-offs, net of recoveries (1.5 ) (0.4 ) (0.5 ) (0.9 ) (1.0 ) 0.6 Allowance at end of period $ 34.5 $ 31.4 $ 28.2 $ 23.8 $ 5.5 $ 6.7

Note 2 - Revenue

Note 2 - Revenue	3 Months Ended
	Dec. 31, 2022
Notes to Financial Statements
Revenue from Contract with Customer [Text Block]	2. The following tables show revenue disaggregated by source and customer type. Three Months Ended December 31, 2022 2021 Spire Gas Utility: Residential $ 518.0 $ 342.0 Commercial and industrial 170.6 103.8 Transportation 30.9 31.2 Off-system and other incentive 7.6 4.8 Other customer revenue 4.4 3.6 Total revenue from contracts with customers 731.5 485.4 Changes in accrued revenue under alternative revenue programs 1.5 18.1 Total Gas Utility operating revenues 733.0 503.5 Gas Marketing 74.1 47.9 Midstream 15.2 12.9 Other 4.0 3.7 Total before eliminations 826.3 568.0 Intersegment eliminations (see Note 9, Information by Operating Segment) (12.3 ) (12.6 ) Total Operating Revenues $ 814.0 $ 555.4 Spire Missouri Residential $ 400.6 $ 247.1 Commercial and industrial 122.9 68.2 Transportation 9.1 9.2 Off-system and other incentive 5.1 4.5 Other customer revenue 2.0 2.3 Total revenue from contracts with customers 539.7 331.3 Changes in accrued revenue under alternative revenue programs 1.5 16.6 Total Operating Revenues $ 541.2 $ 347.9 Spire Alabama Residential $ 96.3 $ 80.1 Commercial and industrial 33.6 26.0 Transportation 19.3 19.4 Off-system and other incentive 2.4 0.4 Other customer revenue 1.2 0.8 Total revenue from contracts with customers 152.8 126.7 Changes in accrued revenue under alternative revenue programs (0.4 ) (0.1 ) Total Operating Revenues $ 152.4 $ 126.6 Gross receipts taxes associated with the Company’s natural gas utility services are imposed on the Company, Spire Missouri, and Spire Alabama and billed to its customers. The expense amounts (shown in the table below) are reported gross in the “Taxes, other than income taxes” line in the statements of income, and corresponding revenues are reported in “Operating Revenues.” Three Months Ended December 31, 2022 2021 Spire $ 30.4 $ 21.9 Spire Missouri 22.1 14.9 Spire Alabama 6.8 5.7

Note 3 - Earnings Per Common Sh

Note 3 - Earnings Per Common Share	3 Months Ended
	Dec. 31, 2022
Notes to Financial Statements
Earnings Per Share [Text Block]	3. Three Months Ended December 31, 2022 2021 Basic Earnings Per Common Share: Net Income $ 91.0 $ 55.7 Less: Provision for preferred dividends 3.7 3.7 Income allocated to participating securities 0.1 0.1 Income Available to Common Shareholders $ 87.2 $ 51.9 Weighted Average Common Shares Outstanding (in millions) 52.4 51.6 Basic Earnings Per Common Share $ 1.66 $ 1.01 Diluted Earnings Per Common Share: Net Income $ 91.0 $ 55.7 Less: Provision for preferred dividends 3.7 3.7 Income allocated to participating securities 0.1 0.1 Income Available to Common Shareholders $ 87.2 $ 51.9 Weighted Average Common Shares Outstanding (in millions) 52.4 51.6 Dilutive Effect of Restricted Stock and Restricted Stock Units (in millions)* 0.2 0.1 Weighted Average Diluted Common Shares (in millions) 52.6 51.7 Diluted Earnings Per Common Share $ 1.66 $ 1.01 * Calculation excludes certain outstanding common shares (shown in millions by period at the right) attributable to stock units subject to performance or market conditions and restricted stock, which could have a dilutive effect in the future 0.2 0.2

Note 4 - Regulatory Matters

Note 4 - Regulatory Matters	3 Months Ended
	Dec. 31, 2022
Notes to Financial Statements
Public Utilities Disclosure [Text Block]	4. As explained in Note 1 980, Regulated Operations December 31, 2022, September 30, 2022, December 31, 2021. December 31, September 30, December 31, Spire 2022 2022 2021 Regulatory Assets: Current: Unamortized purchased gas adjustments $ 238.9 $ 322.2 $ 242.4 Other 30.2 33.2 23.3 Total Current Regulatory Assets 269.1 355.4 265.7 Noncurrent: Pension and postretirement benefit costs 277.3 294.5 335.9 Cost of removal 506.1 493.7 444.5 Future income taxes due from customers 138.6 137.8 135.5 Energy efficiency 59.1 57.2 52.0 Unamortized purchased gas adjustments 107.9 — 27.3 Other 131.7 129.2 94.7 Total Noncurrent Regulatory Assets 1,220.7 1,112.4 1,089.9 Total Regulatory Assets $ 1,489.8 $ 1,467.8 $ 1,355.6 Regulatory Liabilities: Current: Other $ 3.7 $ 3.7 $ 4.1 Total Current Regulatory Liabilities 3.7 3.7 4.1 Noncurrent: Deferred taxes due to customers 140.9 145.3 155.5 Pension and postretirement benefit costs 156.6 172.6 172.2 Accrued cost of removal 33.7 32.9 35.3 Unamortized purchased gas adjustments — 53.0 155.0 Other 13.7 14.4 13.8 Total Noncurrent Regulatory Liabilities 344.9 418.2 531.8 Total Regulatory Liabilities $ 348.6 $ 421.9 $ 535.9 December 31, September 30, December 31, Spire Missouri 2022 2022 2021 Regulatory Assets: Current: Unamortized purchased gas adjustments $ 181.2 $ 275.1 $ 235.2 Other 10.0 13.0 1.7 Total Current Regulatory Assets 191.2 288.1 236.9 Noncurrent: Future income taxes due from customers 130.1 129.2 126.9 Pension and postretirement benefit costs 197.4 222.9 241.6 Energy efficiency 59.1 57.2 52.0 Unamortized purchased gas adjustments 107.9 — 27.3 Cost of removal 23.9 25.2 34.9 Other 116.3 113.1 77.8 Total Noncurrent Regulatory Assets 634.7 547.6 560.5 Total Regulatory Assets $ 825.9 $ 835.7 $ 797.4 Regulatory Liabilities: Current: Other $ — $ — $ 0.2 Total Current Regulatory Liabilities — — 0.2 Noncurrent: Deferred taxes due to customers 124.6 127.9 138.2 Pension and postretirement benefit costs 127.4 143.6 142.6 Accrued cost of removal — — 3.3 Unamortized purchased gas adjustments — 53.0 155.0 Other 7.0 7.3 8.1 Total Noncurrent Regulatory Liabilities 259.0 331.8 447.2 Total Regulatory Liabilities $ 259.0 $ 331.8 $ 447.4 December 31, September 30, December 31, Spire Alabama 2022 2022 2021 Regulatory Assets: Current: Unamortized purchased gas adjustments $ 54.5 $ 43.8 $ 4.1 Other 12.8 13.1 10.5 Total Current Regulatory Assets 67.3 56.9 14.6 Noncurrent: Future income taxes due from customers 2.1 2.2 2.2 Pension and postretirement benefit costs 75.1 66.5 88.7 Cost of removal 482.2 468.5 409.6 Other 1.0 1.0 1.2 Total Noncurrent Regulatory Assets 560.4 538.2 501.7 Total Regulatory Assets $ 627.7 $ 595.1 $ 516.3 Regulatory Liabilities: Current: Other $ — $ — $ 0.8 Total Current Regulatory Liabilities — — 0.8 Noncurrent: Pension and postretirement benefit costs 18.7 19.4 21.6 Other 3.5 3.6 3.7 Total Noncurrent Regulatory Liabilities 22.2 23.0 25.3 Total Regulatory Liabilities $ 22.2 $ 23.0 $ 26.1 A portion of the Company’s and Spire Missouri’s regulatory assets are not December 31, September 30, December 31, 2022 2022 2021 Spire Pension and postretirement benefit costs $ 127.0 $ 152.9 $ 163.4 Future income taxes due from customers 136.4 135.6 133.3 Unamortized purchased gas adjustments 289.1 275.1 262.5 Other 122.9 122.7 107.4 Total Regulatory Assets Not Earning a Return $ 675.4 $ 686.3 $ 666.6 Spire Missouri Pension and postretirement benefit costs $ 127.0 $ 152.9 $ 163.4 Future income taxes due from customers 130.1 129.2 126.9 Unamortized purchased gas adjustments 289.1 275.1 262.5 Other 122.9 122.7 107.4 Total Regulatory Assets Not Earning a Return $ 669.1 $ 679.9 $ 660.2 Like all the Company’s regulatory assets, these regulatory assets as of December 31, 2022 two not not 35 not not Spire Missouri In mid- February 2021, third three not February 2022, second 2022. three May 2022, The MoPSC approved compliance tariffs with an effective date of December 23, 2021, 2021 0108. November 12, 2021, March 18, 2022. April 13, 2022, may December 23, 2021 42.8 September 30, 2022, • $ 19.0 • $ 18.8 • $5.0 of prudent costs related to an April 2022 On April 1, 2022, November 4, 2022. November 18, 2022, December 26, 2022. The ISRS allows Spire Missouri expedited recovery for its investment to replace qualifying components of its infrastructure without the necessity of a formal rate case. On December 27, 2022, October 2022 February 2023. March 27, 2023. zero December 26, 2022 On May 27, 2022, first no July 11, 2022, July 29 August 1, 2022, July 25- 26, 2023. January 6, 2023, January 25, 2023, The MoPSC has initiated their annual ACA dockets (GR- 2022 0135 2022 0136 2020 2021 December 15, 2022, Spire Missouri filed its responses to these Reports and Recommendations on January 19, 2023. not The Utilities purchase the natural gas to be delivered to their customers and typically defer the recovery of this expense thereby lessening the immediate impact on customers’ bills of higher realized commodity costs. These deferred gas balances are expected to be recovered over the next 12 18 November January November 29, 2022 January 19, 2023, Spire Alabama On October 26, 2022, September 30, 2023, 2017 January 1, 2023. Spire Alabama filed GSA rate increases effective December 1, 2022, January 1, 2023, Spire In addition to those discussed above for Spire Missouri and Spire Alabama, Spire is affected by the following regulatory matters. In October 2022, 2023 January 1, 2023. On September 14, 2022, June 30, 2022, December 6, 2022, January 1, 2023. In August 2018, “August 2018 November 2018, November 2019, November 2019, August 2018 one January 2020, two June 22, 2021, September 14, 2021 December 3, 2021, December 3, 2021 February 3, 2022 February 17, 2022. March 7, 2022, one December 3, 2021 June 29, 2022, December 3, 2021 December 15, 2022, January 17, 2023,

Note 5 - Financing

Note 5 - Financing	3 Months Ended
	Dec. 31, 2022
Notes to Financial Statements
Debt Disclosure [Text Block]	5. Short-term Spire, Spire Missouri and Spire Alabama have a syndicated revolving credit facility pursuant to a loan agreement with 12 July 22, 2022, July 22, 2027. may three $1,300.0 may no December 31, 2022, December 31, 2022. Spire utilizes a commercial paper program (“CP Program”) pursuant to which Spire may may not may 365 In March 2021, March 2022. After quarter end, on January 5, 2023, October 5, 2023. one three Information about short-term borrowings, including Spire Missouri’s and Spire Alabama’s borrowings from Spire, is presented in the following table. As of December 31, 2022, Spire (Parent Only) Spire Missouri Spire Alabama Spire CP Term Spire Spire Consol- Program Loan Note Note idated Three Months Ended December 31, 2022 Highest borrowings outstanding $ 1,230.0 $ — $ 651.2 $ 274.0 $ 1,230.0 Lowest borrowings outstanding 829.5 — 439.6 76.7 829.5 Weighted average borrowings 1,071.3 — 529.6 138.3 1,071.3 Weighted average interest rate 4.4 % n/a 4.3 % 4.2 % 4.4 % As of December 31, 2022 Borrowings outstanding $ 1,227.0 $ — $ 651.2 $ 145.8 $ 1,227.0 Weighted average interest rate 4.9 % n/a 4.9 % 4.9 % 4.9 % As of September 30, 2022 Borrowings outstanding $ 1,037.5 $ — $ 445.3 $ 260.9 $ 1,037.5 Weighted average interest rate 3.3 % 0.0 % 3.3 % 3.3 % 3.3 % As of December 31, 2021 Borrowings outstanding $ 596.0 $ 250.0 $ 180.4 $ 173.7 $ 846.0 Weighted average interest rate 0.4 % 0.7 % 0.4 % 0.4 % 0.5 % Long-term The long-term debt agreements of Spire, Spire Missouri and Spire Alabama contain customary financial covenants and default provisions. As of December 31, 2022, no Interest expense shown on the statements of income is net of the capitalized interest amounts shown in the following table. Three Months Ended December 31, 2022 2021 Spire $ 1.6 $ 1.1 Spire Missouri 0.5 — Spire Alabama 0.7 0.8 On October 13, 2022, October 15, 2029, October 15, 2032, October 13, 2022, first October 15, 2037, first may

Note 6 - Fair Value of Financia

Note 6 - Fair Value of Financial Instruments	3 Months Ended
	Dec. 31, 2022
Notes to Financial Statements
Fair Value Disclosures [Text Block]	6. The carrying amounts of cash and cash equivalents, notes receivable, and short-term debt approximate fair value due to the short maturity of these instruments. The fair values of long-term debt are estimated based on market prices for similar issues. Refer to Note 7 The carrying amounts and estimated fair values of financial instruments not no 3 December 31, 2022, September 30, 2022, December 31, 2021. Classification of Estimated Fair Value Carrying Amount Fair Value Quoted Prices in Active Markets (Level 1) Significant Observable Inputs (Level 2) Spire As of December 31, 2022 Cash and cash equivalents $ 4.8 $ 4.8 $ 4.8 $ — Notes payable 1,227.0 1,227.0 — 1,227.0 Long-term debt, including current portion 3,412.9 3,083.7 — 3,083.7 As of September 30, 2022 Cash and cash equivalents $ 6.5 $ 6.5 $ 6.5 $ — Notes payable 1,037.5 1,037.5 — 1,037.5 Long-term debt, including current portion 3,239.7 2,851.8 — 2,851.8 As of December 31, 2021 Cash and cash equivalents $ 8.2 $ 8.2 $ 8.2 $ — Notes payable 846.0 846.0 — 846.0 Long-term debt, including current portion 3,238.0 3,594.4 — 3,594.4 Spire Missouri As of December 31, 2022 Notes payable – associated companies $ 651.2 $ 651.2 $ — $ 651.2 Long-term debt, including current portion 1,638.1 1,497.7 — 1,497.7 As of September 30, 2022 Notes payable – associated companies $ 445.3 $ 445.3 $ — $ 445.3 Long-term debt, including current portion 1,637.7 1,473.9 — 1,473.9 As of December 31, 2021 Notes payable $ 250.0 $ 250.0 $ — $ 250.0 Notes payable – associated companies 180.4 180.4 — 180.4 Long-term debt 1,637.0 1,830.5 — 1,830.5 Spire Alabama As of December 31, 2022 Notes payable – associated companies $ 145.8 $ 145.8 $ — $ 145.8 Long-term debt 745.6 674.5 — 674.5 As of September 30, 2022 Cash and cash equivalents $ 2.4 $ 2.4 $ 2.4 $ — Notes payable – associated companies 260.9 260.9 — 260.9 Long-term debt 571.5 485.0 — 485.0 As of December 31, 2021 Notes payable – associated companies $ 173.7 $ 173.7 $ — $ 173.7 Long-term debt, including current portion 571.3 653.6 — 653.6

Note 7 - Fair Value Measurement

Note 7 - Fair Value Measurement	3 Months Ended
	Dec. 31, 2022
Notes to Financial Statements
Fair Value Measurement and Measurement Inputs, Recurring and Nonrecurring [Text Block]	7. The information presented in the following tables categorizes the assets and liabilities in the balance sheets that are accounted for at fair value on a recurring basis in periods subsequent to initial recognition. The mutual funds included in Level 1 Derivative instruments included in Level 1 2 2 3 no 3 December 31, 2022, September 30, 2022, December 31, 2021. The mutual funds are included in “Other Investments” on the Company’s balance sheets and in “Other Property and Investments” on Spire Missouri’s balance sheets. Changes in their recurring valuations are recorded as unrealized gains or losses in the corresponding income statement. Derivative assets and liabilities, including receivables and payables associated with cash margin requirements, are presented net in the balance sheets when a legally enforceable netting agreement exists between the Company, Spire Missouri, or Spire Alabama and the counterparty to a derivative contract. Spire Quoted Prices in Active Markets (Level 1) Significant Observable Inputs (Level 2) Effects of Netting and Cash Margin Receivables /Payables Total As of December 31, 2022 ASSETS Gas Utility: U.S. stock/bond mutual funds $ 19.5 $ — $ — $ 19.5 NYMEX/ICE natural gas contracts 0.4 — (0.4 ) — Gasoline and heating oil contracts 0.2 — (0.2 ) — Gas Marketing: NYMEX/ICE natural gas contracts 52.0 — (52.0 ) — Natural gas commodity contracts 92.9 — (13.2 ) 79.7 Other: U.S. stock/bond mutual funds 28.3 — — 28.3 Interest rate swaps 61.4 — — 61.4 Total $ 254.7 $ — $ (65.8 ) $ 188.9 LIABILITIES Gas Utility: NYMEX/ICE natural gas contracts $ 35.7 $ — $ (35.7 ) $ — Gasoline and heating oil contracts 0.2 — (0.2 ) — Gas Marketing: NYMEX/ICE natural gas contracts 58.4 — (58.4 ) — Natural gas commodity contracts 71.1 — (13.2 ) 57.9 Other: Interest rate swaps 0.8 — — 0.8 Total $ 166.2 $ — $ (107.5 ) $ 58.7 Quoted Prices in Active Markets (Level 1) Significant Observable Inputs (Level 2) Effects of Netting and Cash Margin Receivables /Payables Total As of September 30, 2022 ASSETS Gas Utility: U.S. stock/bond mutual funds $ 19.1 $ — $ — $ 19.1 NYMEX/ICE natural gas contracts 57.8 — (57.8 ) — Gas Marketing: NYMEX/ICE natural gas contracts 91.8 — (91.8 ) — Natural gas commodity contracts 56.6 — (4.0 ) 52.6 Other: U.S. stock/bond mutual funds 29.3 — — 29.3 Interest rate swaps 63.6 — — 63.6 Total $ 318.2 $ — $ (153.6 ) $ 164.6 LIABILITIES Gas Utility: NYMEX/ICE natural gas contracts $ 30.7 $ — $ (30.7 ) $ — Gas Marketing: NYMEX/ICE natural gas contracts 82.3 — (82.3 ) — Natural gas commodity contracts 65.5 — (4.0 ) 61.5 Total $ 178.5 $ — $ (117.0 ) $ 61.5 As of December 31, 2021 ASSETS Gas Utility: U.S. stock/bond mutual funds $ 24.8 $ — $ — $ 24.8 NYMEX/ICE natural gas contracts 2.4 — (2.4 ) — Gas Marketing: NYMEX/ICE natural gas contracts — 67.0 (67.0 ) — Natural gas commodity contracts — 40.4 (2.3 ) 38.1 Other: U.S. stock/bond mutual funds 24.6 — — 24.6 Interest rate swaps 9.4 — (5.6 ) 3.8 Total $ 61.2 $ 107.4 $ (77.3 ) $ 91.3 LIABILITIES Gas Utility: NYMEX/ICE natural gas contracts $ 8.6 $ — $ (8.6 ) $ — Gas Marketing: NYMEX/ICE natural gas contracts — 40.2 (40.2 ) — Natural gas commodity contracts — 77.9 (2.3 ) 75.6 Other: Interest rate swaps 7.3 — (5.6 ) 1.7 Total $ 15.9 $ 118.1 $ (56.7 ) $ 77.3 Spire Missouri Quoted Prices in Active Markets (Level 1) Significant Observable Inputs (Level 2) Effects of Netting and Cash Margin Receivables /Payables Total As of December 31, 2022 ASSETS U.S. stock/bond mutual funds $ 19.5 $ — $ — $ 19.5 NYMEX/ICE natural gas contracts 0.4 — (0.4 ) — Gasoline and heating oil contracts 0.2 — (0.2 ) — Total $ 20.1 $ — $ (0.6 ) $ 19.5 LIABILITIES NYMEX/ICE natural gas contracts $ 35.7 $ — $ (35.7 ) $ — Gasoline and heating oil contracts 0.2 — (0.2 ) — Total $ 35.9 $ — $ (35.9 ) $ — As of September 30, 2022 ASSETS U.S. stock/bond mutual funds $ 19.1 $ — $ — $ 19.1 NYMEX/ICE natural gas contracts 57.8 — (57.8 ) — Total $ 76.9 $ — $ (57.8 ) $ 19.1 LIABILITIES NYMEX/ICE natural gas contracts $ 30.7 $ — $ (30.7 ) $ — As of December 31, 2021 ASSETS U.S. stock/bond mutual funds $ 24.8 $ — $ — $ 24.8 NYMEX/ICE natural gas contracts 2.4 — (2.4 ) — Total $ 27.2 $ — $ (2.4 ) $ 24.8 LIABILITIES NYMEX/ICE natural gas contracts $ 8.6 $ — $ (8.6 ) $ —

Note 8 - Pension Plans and Othe

Note 8 - Pension Plans and Other Postretirement Benefits	3 Months Ended
	Dec. 31, 2022
Notes to Financial Statements
Retirement Benefits [Text Block]	8. Pension Plans Spire and the Utilities maintain pension plans for their employees. Spire Missouri and Spire Alabama have non-contributory, defined benefit, trusteed forms of pension plans covering the majority of their employees. Qualified plan assets are comprised of mutual and commingled funds consisting of U.S. equities with varying strategies, global equities, alternative investments, and fixed income investments. The net periodic pension cost includes components shown in the following tables. The components other than the service costs and regulatory adjustment are presented in “Other Income, Net” in the income statement, except for Spire Alabama’s losses on lump-sum settlements. Such losses are capitalized in regulatory balances and amortized over the remaining actuarial life of individuals in the plan, and that amortization is presented in “Other Income, Net.” Three Months Ended December 31, 2022 2021 Spire Service cost – benefits earned during the period $ 4.1 $ 5.4 Interest cost on projected benefit obligation 6.4 5.1 Expected return on plan assets (6.4 ) (8.2 ) Amortization of prior service credit (1.1 ) (1.1 ) Amortization of actuarial loss 1.6 3.7 Loss on lump-sum settlements 8.6 — Subtotal 13.2 4.9 Regulatory adjustment 1.8 10.6 Net pension cost $ 15.0 $ 15.5 Spire Missouri Service cost – benefits earned during the period $ 2.8 $ 3.9 Interest cost on projected benefit obligation 4.5 3.5 Expected return on plan assets (4.5 ) (6.0 ) Amortization of prior service credit (0.5 ) (0.5 ) Amortization of actuarial loss 1.5 2.8 Subtotal 3.8 3.7 Regulatory adjustment 8.1 8.5 Net pension cost $ 11.9 $ 12.2 Spire Alabama Service cost – benefits earned during the period $ 1.1 $ 1.4 Interest cost on projected benefit obligation 1.3 1.1 Expected return on plan assets (1.1 ) (1.4 ) Amortization of prior service credit (0.6 ) (0.6 ) Amortization of actuarial loss 0.1 0.9 Loss on lump-sum settlements 8.6 — Subtotal 9.4 1.4 Regulatory adjustment (6.5 ) 1.9 Net pension cost $ 2.9 $ 3.3 Pursuant to the provisions of Spire Missouri’s and Spire Alabama’s pension plans, pension obligations may three December 31, 2022, two one September 30, 2022. one December 31, 2022. December 31, 2021, Effective December 23, 2021, Also effective December 23, 2021, eight eight eight eight The funding policy of the Utilities is to contribute an amount not 2023 December 31, 2022 2023 December 31, 2022 2023 2023 Other Postretirement Benefits Spire and the Utilities provide certain life insurance benefits at retirement. Spire Missouri plans provide for medical insurance after early retirement until age 65. January 1, 2015, The net periodic postretirement benefit cost includes components shown in the following tables. The components other than the service costs and regulatory adjustment are presented in “Other Income, Net” in the income statement, except in the event Spire Alabama incurs losses on lump-sum settlements. Any such losses are capitalized in regulatory balances and amortized over the remaining actuarial life of individuals in the plan, and that amortization is presented in “Other Income, Net.” Three Months Ended December 31, 2022 2021 Spire Service cost – benefits earned during the period $ 1.2 $ 1.9 Interest cost on accumulated postretirement benefit obligation 2.1 1.5 Expected return on plan assets (3.9 ) (4.2 ) Amortization of prior service cost 0.1 0.3 Amortization of actuarial gain (1.0 ) (0.6 ) Subtotal (1.5 ) (1.1 ) Regulatory adjustment 0.1 3.2 Net postretirement benefit (income) cost $ (1.4 ) $ 2.1 Spire Missouri Service cost – benefits earned during the period $ 1.0 $ 1.6 Interest cost on accumulated postretirement benefit obligation 1.6 1.1 Expected return on plan assets (2.6 ) (2.8 ) Amortization of prior service cost 0.2 0.2 Amortization of actuarial gain (0.8 ) (0.5 ) Subtotal (0.6 ) (0.4 ) Regulatory adjustment 0.6 3.6 Net postretirement benefit cost $ — $ 3.2 Spire Alabama Service cost – benefits earned during the period $ 0.2 $ 0.3 Interest cost on accumulated postretirement benefit obligation 0.4 0.4 Expected return on plan assets (1.2 ) (1.3 ) Amortization of prior service (credit) cost (0.1 ) 0.1 Amortization of actuarial gain (0.1 ) — Subtotal (0.8 ) (0.5 ) Regulatory adjustment (0.5 ) (0.5 ) Net postretirement benefit income $ (1.3 ) $ (1.0 ) Missouri and Alabama state laws provide for the recovery in rates of costs accrued pursuant to GAAP provided that such costs are funded through an independent, external funding mechanism. The Utilities have established Voluntary Employees’ Beneficiary Association (VEBA) and Rabbi Trusts as external funding mechanisms. The assets of the VEBA and Rabbi Trusts consist primarily of money market securities and mutual funds invested in stocks and bonds. Effective December 23, 2021, no The Utilities’ funding policy is to contribute amounts to the trusts equal to the periodic benefit cost calculated pursuant to GAAP as recovered in rates. There have been no contributions to the postretirement plans through December 31, 2022

Note 9 - Information by Operati

Note 9 - Information by Operating Segment	3 Months Ended
	Dec. 31, 2022
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	9. The Company has three reportable segments: Gas Utility, Gas Marketing, and Midstream. The Gas Utility segment is the aggregation of the operations of the Utilities. The Gas Marketing segment includes the results of Spire Marketing, a subsidiary engaged in the non-regulated marketing of natural gas and related activities, including utilizing natural gas storage contracts for providing natural gas sales. The Midstream segment includes Spire STL Pipeline, a subsidiary of Spire providing interstate natural gas pipeline transportation services, and Spire Storage, a subsidiary of Spire providing interstate natural gas storage services. Other components of the Company’s consolidated information include Spire's subsidiaries engaged in the operation of a propane pipeline and risk management, among other activities, and unallocated corporate items, including certain debt and associated interest costs. Accounting policies are described in Note 1 Management evaluates the performance of the operating segments based on the computation of net economic earnings. Net economic earnings exclude from reported net income the after-tax impacts of fair value accounting and timing adjustments associated with energy-related transactions, the impacts of acquisition, divestiture and restructuring activities, and the largely non-cash impacts of impairments and other non-recurring or unusual items such as certain regulatory, legislative, or GAAP standard-setting actions. Gas Utility Gas Marketing Midstream Other Eliminations Consolidated Three Months Ended December 31, 2022 Operating Revenues: Revenues from external customers $ 733.0 $ 74.1 $ 6.8 $ 0.1 $ — $ 814.0 Intersegment revenues — — 8.4 3.9 (12.3 ) — Total Operating Revenues 733.0 74.1 15.2 4.0 (12.3 ) 814.0 Operating Expenses: Natural gas 401.6 26.0 — — (8.4 ) 419.2 Operation and maintenance 119.9 6.3 5.8 4.0 (3.9 ) 132.1 Depreciation and amortization 59.7 0.3 1.9 0.2 — 62.1 Taxes, other than income taxes 49.9 0.1 0.4 — — 50.4 Total Operating Expenses 631.1 32.7 8.1 4.2 (12.3 ) 663.8 Operating Income (Loss) $ 101.9 $ 41.4 $ 7.1 $ (0.2 ) $ — $ 150.2 Net Economic Earnings (Loss) $ 62.9 $ 25.7 $ 3.8 $ (7.3 ) $ — $ 85.1 Gas Utility Gas Marketing Midstream Other Eliminations Consolidated Three Months Ended December 31, 2021 Operating Revenues: Revenues from external customers $ 503.5 $ 47.9 $ 3.8 $ 0.2 $ — $ 555.4 Intersegment revenues — — 9.1 3.5 (12.6 ) — Total Operating Revenues 503.5 47.9 12.9 3.7 (12.6 ) 555.4 Operating Expenses: Natural gas 210.2 48.0 — — (9.0 ) 249.2 Operation and maintenance 107.3 2.7 5.8 4.2 (3.6 ) 116.4 Depreciation and amortization 54.6 0.3 1.9 0.1 — 56.9 Taxes, other than income taxes 37.0 — 0.6 — — 37.6 Total Operating Expenses 409.1 51.0 8.3 4.3 (12.6 ) 460.1 Operating Income (Loss) $ 94.4 $ (3.1 ) $ 4.6 $ (0.6 ) $ — $ 95.3 Net Economic Earnings (Loss) $ 67.2 $ 0.5 $ 2.5 $ (7.6 ) $ — $ 62.6 The following table reconciles the Company’s net economic earnings to net income. Three Months Ended December 31, 2022 2021 Net Income $ 91.0 $ 55.7 Adjustments, pre-tax: Fair value and timing adjustments (7.8 ) 3.7 Income tax adjustments 1.9 3.2 Net Economic Earnings $ 85.1 $ 62.6 The Company’s total assets by segment were as follows: December 31, September 30, December 31, 2022 2022 2021 Total Assets: Gas Utility $ 8,355.1 $ 8,042.8 $ 7,882.1 Gas Marketing 492.4 638.7 424.4 Midstream 466.6 446.0 421.7 Other 2,882.8 2,449.2 1,995.9 Eliminations (1,869.2 ) (1,493.0 ) (1,073.6 ) Total Assets $ 10,327.7 $ 10,083.7 $ 9,650.5

Note 10 - Commitments and Conti

Note 10 - Commitments and Contingencies	3 Months Ended
	Dec. 31, 2022
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	10. Commitments The Company and the Utilities have entered into contracts with various counterparties, expiring on dates through calendar 2039, December 31, 2022, November April. A consolidated subsidiary of Spire is a limited partner in an unconsolidated partnership focusing on sustainability initiatives largely tied to the natural gas utility sector. Spire committed to contribute a total of $10.0 of capital to the partnership as and when requested by the general partner. As of December 31, 2022, Contingencies The Company and the Utilities account for contingencies, including environmental liabilities, in accordance with accounting standards under the loss contingency guidance of ASC Topic 450, Contingencies In addition to matters noted below, the Company and the Utilities are involved in other litigation, claims, and investigations arising in the normal course of business. Management, after discussion with counsel, believes the final outcome will not The Company and the Utilities own and operate natural gas distribution, transmission, and storage facilities, the operations of which are subject to various environmental laws, regulations, and interpretations. While environmental issues resulting from such operations arise in the ordinary course of business, such issues have not may may may In the natural gas industry, many gas distribution companies have incurred environmental liabilities associated with sites they or their predecessor companies formerly owned or operated where manufactured gas operations took place. The Utilities each have former manufactured gas plant (MGP) operations in their respective service territories, some of which are discussed under the Spire Missouri and Spire Alabama headings below. To the extent costs are incurred associated with environmental remediation activities, the Utilities would request authority from their respective regulators to defer such costs (less any amounts received from insurance proceeds or as contributions from other potentially responsible parties (PRPs)) and collect them through future rates. To date, costs incurred for all Spire MGP sites for investigation, remediation and monitoring have not may may In 2020, March 2021, not may Spire Missouri Spire Missouri has identified three two third In conjunction with redevelopment of the Carondelet Coke site, Spire Missouri and another former owner of the site entered into an agreement (the “Remediation Agreement”) with the City development agencies, the developer, and an environmental consultant that obligates one No December 20, 2010, seven six In a letter dated June 29, 2011, second January 10, 2012, no Additionally, in correspondence dated November 30, 2016, 7 107 1980 third not March 2017 Spire Missouri has notified its insurers that it seeks reimbursement for costs incurred in the past and future potential liabilities associated with these MGP sites. While some of the insurers have denied coverage and reserved their rights, Spire Missouri retains the right to seek potential reimbursements from them. On March 10, 2015, 104 7 April 3, 2015, July 15, 2015, August 15, 2015. no In its western service area, Spire Missouri has six #1, #1, #2. 2003 September 15, 2016, six May 11, 2015, Spire Alabama Spire Alabama is in the chain of title of nine four five one In 2011, In 2012, 104 35th not 35th Assessments were performed by the EPA of the former MGP sites in Gadsden and Anniston, and NFA letters were received after each assessment. Spire In addition to those discussed above for Spire Missouri and Spire Alabama, Spire is aware of the following contingent matters. Spire Marketing, along with many natural gas industry participants, faced the unprecedented effects of Winter Storm Uri in February 2021. may

Significant Accounting Policies

Significant Accounting Policies (Policies)	3 Months Ended
	Dec. 31, 2022
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	BASIS OF PRESENTATION The accompanying unaudited financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP) for interim financial information with the instructions to Form 10 10 01 not 10 10 September 30, 2022. The consolidated financial position, results of operations, and cash flows of Spire include the accounts of the Company and all its subsidiaries. Transactions and balances between consolidated entities have been eliminated from the consolidated financial statements of Spire. In compliance with GAAP, transactions between Spire Missouri and Spire Alabama and their affiliates, as well as intercompany balances on their balance sheets, have not Certain information is presented by reportable segment, as described below. Effective during the first 2023, NATURE OF OPERATIONS three Note 9 Nearly all the Company’s earnings are derived from its Gas Utility segment. Due to the seasonal nature of the Utilities’ business and the volumetric Spire Missouri rate design, earnings are typically concentrated during the heating season of November April not
Public Utilities, Policy [Policy Text Block]	REGULATED OPERATIONS 980, Regulated Operations third may As authorized by the Missouri Public Service Commission (MoPSC), the Mississippi Public Service Commission (MSPSC) and the Alabama Public Service Commission (APSC), the Purchased Gas Adjustment (PGA) clauses and Gas Supply Adjustment (GSA) riders allow the Utilities to pass through to customers the cost of purchased gas supplies. Regulatory assets and liabilities related to the PGA clauses and the GSA riders are both labeled Unamortized Purchased Gas Adjustments herein. See additional information about regulatory assets and liabilities in Note 4
Derivatives, Policy [Policy Text Block]	DERIVATIVES 815, Derivatives and Hedging not
Transactions With Affiliates [Policy Text Block]	TRANSACTIONS WITH AFFILIATES Three Months Ended December 31, 2022 2021 Spire Missouri Purchases of natural gas from Spire Marketing Inc. $ 28.5 $ 18.2 Transportation services received from Spire STL Pipeline LLC 8.1 8.1 Spire Alabama Purchases of natural gas from Spire Marketing Inc. $ 1.1 $ —
Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]	RESTRICTED CASH December 31, 2022, December 31, 2022 September 30, 2022,
Accrued Capital Expenditures [Policy Text Block]	ACCRUED CAPITAL EXPENDITURES December 31, September 30, December 31, 2022 2022 2021 Spire $ 63.1 $ 77.8 $ 33.5 Spire Missouri 32.8 45.6 27.2 Spire Alabama 9.4 19.2 1.2
Receivable [Policy Text Block]	ACCOUNTS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES not Spire Spire Missouri Spire Alabama Three Months Ended December 31, 2022 2021 2022 2021 2022 2021 Allowance at beginning of period $ 31.9 $ 30.3 $ 24.9 $ 22.6 $ 6.3 $ 6.6 Provision for expected credit losses 4.1 1.5 3.8 2.1 0.2 (0.5 ) Write-offs, net of recoveries (1.5 ) (0.4 ) (0.5 ) (0.9 ) (1.0 ) 0.6 Allowance at end of period $ 34.5 $ 31.4 $ 28.2 $ 23.8 $ 5.5 $ 6.7

Note 1 - Summary of Significa_2

Note 1 - Summary of Significant Accounting Policies (Tables)	3 Months Ended
	Dec. 31, 2022
Notes Tables
Schedule of Related Party Transactions [Table Text Block]	Three Months Ended December 31, 2022 2021 Spire Missouri Purchases of natural gas from Spire Marketing Inc. $ 28.5 $ 18.2 Transportation services received from Spire STL Pipeline LLC 8.1 8.1 Spire Alabama Purchases of natural gas from Spire Marketing Inc. $ 1.1 $ —
Schedule Of Capital Expenditure Excluded From Statement Of Cash Flow [Table Text Block]	December 31, September 30, December 31, 2022 2022 2021 Spire $ 63.1 $ 77.8 $ 33.5 Spire Missouri 32.8 45.6 27.2 Spire Alabama 9.4 19.2 1.2
Accounts Receivable, Allowance for Credit Loss [Table Text Block]	Spire Spire Missouri Spire Alabama Three Months Ended December 31, 2022 2021 2022 2021 2022 2021 Allowance at beginning of period $ 31.9 $ 30.3 $ 24.9 $ 22.6 $ 6.3 $ 6.6 Provision for expected credit losses 4.1 1.5 3.8 2.1 0.2 (0.5 ) Write-offs, net of recoveries (1.5 ) (0.4 ) (0.5 ) (0.9 ) (1.0 ) 0.6 Allowance at end of period $ 34.5 $ 31.4 $ 28.2 $ 23.8 $ 5.5 $ 6.7

Note 2 - Revenue (Tables)

Note 2 - Revenue (Tables)	3 Months Ended
	Dec. 31, 2022
Notes Tables
Disaggregation of Revenue [Table Text Block]	Three Months Ended December 31, 2022 2021 Spire Gas Utility: Residential $ 518.0 $ 342.0 Commercial and industrial 170.6 103.8 Transportation 30.9 31.2 Off-system and other incentive 7.6 4.8 Other customer revenue 4.4 3.6 Total revenue from contracts with customers 731.5 485.4 Changes in accrued revenue under alternative revenue programs 1.5 18.1 Total Gas Utility operating revenues 733.0 503.5 Gas Marketing 74.1 47.9 Midstream 15.2 12.9 Other 4.0 3.7 Total before eliminations 826.3 568.0 Intersegment eliminations (see Note 9, Information by Operating Segment) (12.3 ) (12.6 ) Total Operating Revenues $ 814.0 $ 555.4 Spire Missouri Residential $ 400.6 $ 247.1 Commercial and industrial 122.9 68.2 Transportation 9.1 9.2 Off-system and other incentive 5.1 4.5 Other customer revenue 2.0 2.3 Total revenue from contracts with customers 539.7 331.3 Changes in accrued revenue under alternative revenue programs 1.5 16.6 Total Operating Revenues $ 541.2 $ 347.9 Spire Alabama Residential $ 96.3 $ 80.1 Commercial and industrial 33.6 26.0 Transportation 19.3 19.4 Off-system and other incentive 2.4 0.4 Other customer revenue 1.2 0.8 Total revenue from contracts with customers 152.8 126.7 Changes in accrued revenue under alternative revenue programs (0.4 ) (0.1 ) Total Operating Revenues $ 152.4 $ 126.6
Schedule Of Taxes On Revenues [Table Text Block]	Three Months Ended December 31, 2022 2021 Spire $ 30.4 $ 21.9 Spire Missouri 22.1 14.9 Spire Alabama 6.8 5.7

Note 3 - Earnings Per Common _2

Note 3 - Earnings Per Common Share (Tables)	3 Months Ended
	Dec. 31, 2022
Notes Tables
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	Three Months Ended December 31, 2022 2021 Basic Earnings Per Common Share: Net Income $ 91.0 $ 55.7 Less: Provision for preferred dividends 3.7 3.7 Income allocated to participating securities 0.1 0.1 Income Available to Common Shareholders $ 87.2 $ 51.9 Weighted Average Common Shares Outstanding (in millions) 52.4 51.6 Basic Earnings Per Common Share $ 1.66 $ 1.01 Diluted Earnings Per Common Share: Net Income $ 91.0 $ 55.7 Less: Provision for preferred dividends 3.7 3.7 Income allocated to participating securities 0.1 0.1 Income Available to Common Shareholders $ 87.2 $ 51.9 Weighted Average Common Shares Outstanding (in millions) 52.4 51.6 Dilutive Effect of Restricted Stock and Restricted Stock Units (in millions)* 0.2 0.1 Weighted Average Diluted Common Shares (in millions) 52.6 51.7 Diluted Earnings Per Common Share $ 1.66 $ 1.01 * Calculation excludes certain outstanding common shares (shown in millions by period at the right) attributable to stock units subject to performance or market conditions and restricted stock, which could have a dilutive effect in the future 0.2 0.2

Note 4 - Regulatory Matters (Ta

Note 4 - Regulatory Matters (Tables)	3 Months Ended
	Dec. 31, 2022
Notes Tables
Schedule of Regulatory Assets and Liabilities [Table Text Block]	December 31, September 30, December 31, Spire 2022 2022 2021 Regulatory Assets: Current: Unamortized purchased gas adjustments $ 238.9 $ 322.2 $ 242.4 Other 30.2 33.2 23.3 Total Current Regulatory Assets 269.1 355.4 265.7 Noncurrent: Pension and postretirement benefit costs 277.3 294.5 335.9 Cost of removal 506.1 493.7 444.5 Future income taxes due from customers 138.6 137.8 135.5 Energy efficiency 59.1 57.2 52.0 Unamortized purchased gas adjustments 107.9 — 27.3 Other 131.7 129.2 94.7 Total Noncurrent Regulatory Assets 1,220.7 1,112.4 1,089.9 Total Regulatory Assets $ 1,489.8 $ 1,467.8 $ 1,355.6 Regulatory Liabilities: Current: Other $ 3.7 $ 3.7 $ 4.1 Total Current Regulatory Liabilities 3.7 3.7 4.1 Noncurrent: Deferred taxes due to customers 140.9 145.3 155.5 Pension and postretirement benefit costs 156.6 172.6 172.2 Accrued cost of removal 33.7 32.9 35.3 Unamortized purchased gas adjustments — 53.0 155.0 Other 13.7 14.4 13.8 Total Noncurrent Regulatory Liabilities 344.9 418.2 531.8 Total Regulatory Liabilities $ 348.6 $ 421.9 $ 535.9 December 31, September 30, December 31, Spire Missouri 2022 2022 2021 Regulatory Assets: Current: Unamortized purchased gas adjustments $ 181.2 $ 275.1 $ 235.2 Other 10.0 13.0 1.7 Total Current Regulatory Assets 191.2 288.1 236.9 Noncurrent: Future income taxes due from customers 130.1 129.2 126.9 Pension and postretirement benefit costs 197.4 222.9 241.6 Energy efficiency 59.1 57.2 52.0 Unamortized purchased gas adjustments 107.9 — 27.3 Cost of removal 23.9 25.2 34.9 Other 116.3 113.1 77.8 Total Noncurrent Regulatory Assets 634.7 547.6 560.5 Total Regulatory Assets $ 825.9 $ 835.7 $ 797.4 Regulatory Liabilities: Current: Other $ — $ — $ 0.2 Total Current Regulatory Liabilities — — 0.2 Noncurrent: Deferred taxes due to customers 124.6 127.9 138.2 Pension and postretirement benefit costs 127.4 143.6 142.6 Accrued cost of removal — — 3.3 Unamortized purchased gas adjustments — 53.0 155.0 Other 7.0 7.3 8.1 Total Noncurrent Regulatory Liabilities 259.0 331.8 447.2 Total Regulatory Liabilities $ 259.0 $ 331.8 $ 447.4 December 31, September 30, December 31, Spire Alabama 2022 2022 2021 Regulatory Assets: Current: Unamortized purchased gas adjustments $ 54.5 $ 43.8 $ 4.1 Other 12.8 13.1 10.5 Total Current Regulatory Assets 67.3 56.9 14.6 Noncurrent: Future income taxes due from customers 2.1 2.2 2.2 Pension and postretirement benefit costs 75.1 66.5 88.7 Cost of removal 482.2 468.5 409.6 Other 1.0 1.0 1.2 Total Noncurrent Regulatory Assets 560.4 538.2 501.7 Total Regulatory Assets $ 627.7 $ 595.1 $ 516.3 Regulatory Liabilities: Current: Other $ — $ — $ 0.8 Total Current Regulatory Liabilities — — 0.8 Noncurrent: Pension and postretirement benefit costs 18.7 19.4 21.6 Other 3.5 3.6 3.7 Total Noncurrent Regulatory Liabilities 22.2 23.0 25.3 Total Regulatory Liabilities $ 22.2 $ 23.0 $ 26.1
Schedule of Regulatory Assets Not Earning Return [Table Text Block]	December 31, September 30, December 31, 2022 2022 2021 Spire Pension and postretirement benefit costs $ 127.0 $ 152.9 $ 163.4 Future income taxes due from customers 136.4 135.6 133.3 Unamortized purchased gas adjustments 289.1 275.1 262.5 Other 122.9 122.7 107.4 Total Regulatory Assets Not Earning a Return $ 675.4 $ 686.3 $ 666.6 Spire Missouri Pension and postretirement benefit costs $ 127.0 $ 152.9 $ 163.4 Future income taxes due from customers 130.1 129.2 126.9 Unamortized purchased gas adjustments 289.1 275.1 262.5 Other 122.9 122.7 107.4 Total Regulatory Assets Not Earning a Return $ 669.1 $ 679.9 $ 660.2

Note 5 - Financing (Tables)

Note 5 - Financing (Tables)	3 Months Ended
	Dec. 31, 2022
Notes Tables
Schedule of Short-Term Debt [Table Text Block]	Spire (Parent Only) Spire Missouri Spire Alabama Spire CP Term Spire Spire Consol- Program Loan Note Note idated Three Months Ended December 31, 2022 Highest borrowings outstanding $ 1,230.0 $ — $ 651.2 $ 274.0 $ 1,230.0 Lowest borrowings outstanding 829.5 — 439.6 76.7 829.5 Weighted average borrowings 1,071.3 — 529.6 138.3 1,071.3 Weighted average interest rate 4.4 % n/a 4.3 % 4.2 % 4.4 % As of December 31, 2022 Borrowings outstanding $ 1,227.0 $ — $ 651.2 $ 145.8 $ 1,227.0 Weighted average interest rate 4.9 % n/a 4.9 % 4.9 % 4.9 % As of September 30, 2022 Borrowings outstanding $ 1,037.5 $ — $ 445.3 $ 260.9 $ 1,037.5 Weighted average interest rate 3.3 % 0.0 % 3.3 % 3.3 % 3.3 % As of December 31, 2021 Borrowings outstanding $ 596.0 $ 250.0 $ 180.4 $ 173.7 $ 846.0 Weighted average interest rate 0.4 % 0.7 % 0.4 % 0.4 % 0.5 %
Summary Of Capitalized Interest [Table Text Block]	Three Months Ended December 31, 2022 2021 Spire $ 1.6 $ 1.1 Spire Missouri 0.5 — Spire Alabama 0.7 0.8

Note 6 - Fair Value of Financ_2

Note 6 - Fair Value of Financial Instruments (Tables)	3 Months Ended
	Dec. 31, 2022
Notes Tables
Fair Value, by Balance Sheet Grouping [Table Text Block]	Classification of Estimated Fair Value Carrying Amount Fair Value Quoted Prices in Active Markets (Level 1) Significant Observable Inputs (Level 2) Spire As of December 31, 2022 Cash and cash equivalents $ 4.8 $ 4.8 $ 4.8 $ — Notes payable 1,227.0 1,227.0 — 1,227.0 Long-term debt, including current portion 3,412.9 3,083.7 — 3,083.7 As of September 30, 2022 Cash and cash equivalents $ 6.5 $ 6.5 $ 6.5 $ — Notes payable 1,037.5 1,037.5 — 1,037.5 Long-term debt, including current portion 3,239.7 2,851.8 — 2,851.8 As of December 31, 2021 Cash and cash equivalents $ 8.2 $ 8.2 $ 8.2 $ — Notes payable 846.0 846.0 — 846.0 Long-term debt, including current portion 3,238.0 3,594.4 — 3,594.4 Spire Missouri As of December 31, 2022 Notes payable – associated companies $ 651.2 $ 651.2 $ — $ 651.2 Long-term debt, including current portion 1,638.1 1,497.7 — 1,497.7 As of September 30, 2022 Notes payable – associated companies $ 445.3 $ 445.3 $ — $ 445.3 Long-term debt, including current portion 1,637.7 1,473.9 — 1,473.9 As of December 31, 2021 Notes payable $ 250.0 $ 250.0 $ — $ 250.0 Notes payable – associated companies 180.4 180.4 — 180.4 Long-term debt 1,637.0 1,830.5 — 1,830.5 Spire Alabama As of December 31, 2022 Notes payable – associated companies $ 145.8 $ 145.8 $ — $ 145.8 Long-term debt 745.6 674.5 — 674.5 As of September 30, 2022 Cash and cash equivalents $ 2.4 $ 2.4 $ 2.4 $ — Notes payable – associated companies 260.9 260.9 — 260.9 Long-term debt 571.5 485.0 — 485.0 As of December 31, 2021 Notes payable – associated companies $ 173.7 $ 173.7 $ — $ 173.7 Long-term debt, including current portion 571.3 653.6 — 653.6

Note 7 - Fair Value Measureme_2

Note 7 - Fair Value Measurement (Tables)	3 Months Ended
	Dec. 31, 2022
Notes Tables
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	Quoted Prices in Active Markets (Level 1) Significant Observable Inputs (Level 2) Effects of Netting and Cash Margin Receivables /Payables Total As of December 31, 2022 ASSETS Gas Utility: U.S. stock/bond mutual funds $ 19.5 $ — $ — $ 19.5 NYMEX/ICE natural gas contracts 0.4 — (0.4 ) — Gasoline and heating oil contracts 0.2 — (0.2 ) — Gas Marketing: NYMEX/ICE natural gas contracts 52.0 — (52.0 ) — Natural gas commodity contracts 92.9 — (13.2 ) 79.7 Other: U.S. stock/bond mutual funds 28.3 — — 28.3 Interest rate swaps 61.4 — — 61.4 Total $ 254.7 $ — $ (65.8 ) $ 188.9 LIABILITIES Gas Utility: NYMEX/ICE natural gas contracts $ 35.7 $ — $ (35.7 ) $ — Gasoline and heating oil contracts 0.2 — (0.2 ) — Gas Marketing: NYMEX/ICE natural gas contracts 58.4 — (58.4 ) — Natural gas commodity contracts 71.1 — (13.2 ) 57.9 Other: Interest rate swaps 0.8 — — 0.8 Total $ 166.2 $ — $ (107.5 ) $ 58.7 Quoted Prices in Active Markets (Level 1) Significant Observable Inputs (Level 2) Effects of Netting and Cash Margin Receivables /Payables Total As of September 30, 2022 ASSETS Gas Utility: U.S. stock/bond mutual funds $ 19.1 $ — $ — $ 19.1 NYMEX/ICE natural gas contracts 57.8 — (57.8 ) — Gas Marketing: NYMEX/ICE natural gas contracts 91.8 — (91.8 ) — Natural gas commodity contracts 56.6 — (4.0 ) 52.6 Other: U.S. stock/bond mutual funds 29.3 — — 29.3 Interest rate swaps 63.6 — — 63.6 Total $ 318.2 $ — $ (153.6 ) $ 164.6 LIABILITIES Gas Utility: NYMEX/ICE natural gas contracts $ 30.7 $ — $ (30.7 ) $ — Gas Marketing: NYMEX/ICE natural gas contracts 82.3 — (82.3 ) — Natural gas commodity contracts 65.5 — (4.0 ) 61.5 Total $ 178.5 $ — $ (117.0 ) $ 61.5 As of December 31, 2021 ASSETS Gas Utility: U.S. stock/bond mutual funds $ 24.8 $ — $ — $ 24.8 NYMEX/ICE natural gas contracts 2.4 — (2.4 ) — Gas Marketing: NYMEX/ICE natural gas contracts — 67.0 (67.0 ) — Natural gas commodity contracts — 40.4 (2.3 ) 38.1 Other: U.S. stock/bond mutual funds 24.6 — — 24.6 Interest rate swaps 9.4 — (5.6 ) 3.8 Total $ 61.2 $ 107.4 $ (77.3 ) $ 91.3 LIABILITIES Gas Utility: NYMEX/ICE natural gas contracts $ 8.6 $ — $ (8.6 ) $ — Gas Marketing: NYMEX/ICE natural gas contracts — 40.2 (40.2 ) — Natural gas commodity contracts — 77.9 (2.3 ) 75.6 Other: Interest rate swaps 7.3 — (5.6 ) 1.7 Total $ 15.9 $ 118.1 $ (56.7 ) $ 77.3 Quoted Prices in Active Markets (Level 1) Significant Observable Inputs (Level 2) Effects of Netting and Cash Margin Receivables /Payables Total As of December 31, 2022 ASSETS U.S. stock/bond mutual funds $ 19.5 $ — $ — $ 19.5 NYMEX/ICE natural gas contracts 0.4 — (0.4 ) — Gasoline and heating oil contracts 0.2 — (0.2 ) — Total $ 20.1 $ — $ (0.6 ) $ 19.5 LIABILITIES NYMEX/ICE natural gas contracts $ 35.7 $ — $ (35.7 ) $ — Gasoline and heating oil contracts 0.2 — (0.2 ) — Total $ 35.9 $ — $ (35.9 ) $ — As of September 30, 2022 ASSETS U.S. stock/bond mutual funds $ 19.1 $ — $ — $ 19.1 NYMEX/ICE natural gas contracts 57.8 — (57.8 ) — Total $ 76.9 $ — $ (57.8 ) $ 19.1 LIABILITIES NYMEX/ICE natural gas contracts $ 30.7 $ — $ (30.7 ) $ — As of December 31, 2021 ASSETS U.S. stock/bond mutual funds $ 24.8 $ — $ — $ 24.8 NYMEX/ICE natural gas contracts 2.4 — (2.4 ) — Total $ 27.2 $ — $ (2.4 ) $ 24.8 LIABILITIES NYMEX/ICE natural gas contracts $ 8.6 $ — $ (8.6 ) $ —

Note 8 - Pension Plans and Ot_2

Note 8 - Pension Plans and Other Postretirement Benefits (Tables)	3 Months Ended
	Dec. 31, 2022
Notes Tables
Schedule of Net Benefit Costs [Table Text Block]	Three Months Ended December 31, 2022 2021 Spire Service cost – benefits earned during the period $ 4.1 $ 5.4 Interest cost on projected benefit obligation 6.4 5.1 Expected return on plan assets (6.4 ) (8.2 ) Amortization of prior service credit (1.1 ) (1.1 ) Amortization of actuarial loss 1.6 3.7 Loss on lump-sum settlements 8.6 — Subtotal 13.2 4.9 Regulatory adjustment 1.8 10.6 Net pension cost $ 15.0 $ 15.5 Spire Missouri Service cost – benefits earned during the period $ 2.8 $ 3.9 Interest cost on projected benefit obligation 4.5 3.5 Expected return on plan assets (4.5 ) (6.0 ) Amortization of prior service credit (0.5 ) (0.5 ) Amortization of actuarial loss 1.5 2.8 Subtotal 3.8 3.7 Regulatory adjustment 8.1 8.5 Net pension cost $ 11.9 $ 12.2 Spire Alabama Service cost – benefits earned during the period $ 1.1 $ 1.4 Interest cost on projected benefit obligation 1.3 1.1 Expected return on plan assets (1.1 ) (1.4 ) Amortization of prior service credit (0.6 ) (0.6 ) Amortization of actuarial loss 0.1 0.9 Loss on lump-sum settlements 8.6 — Subtotal 9.4 1.4 Regulatory adjustment (6.5 ) 1.9 Net pension cost $ 2.9 $ 3.3 Three Months Ended December 31, 2022 2021 Spire Service cost – benefits earned during the period $ 1.2 $ 1.9 Interest cost on accumulated postretirement benefit obligation 2.1 1.5 Expected return on plan assets (3.9 ) (4.2 ) Amortization of prior service cost 0.1 0.3 Amortization of actuarial gain (1.0 ) (0.6 ) Subtotal (1.5 ) (1.1 ) Regulatory adjustment 0.1 3.2 Net postretirement benefit (income) cost $ (1.4 ) $ 2.1 Spire Missouri Service cost – benefits earned during the period $ 1.0 $ 1.6 Interest cost on accumulated postretirement benefit obligation 1.6 1.1 Expected return on plan assets (2.6 ) (2.8 ) Amortization of prior service cost 0.2 0.2 Amortization of actuarial gain (0.8 ) (0.5 ) Subtotal (0.6 ) (0.4 ) Regulatory adjustment 0.6 3.6 Net postretirement benefit cost $ — $ 3.2 Spire Alabama Service cost – benefits earned during the period $ 0.2 $ 0.3 Interest cost on accumulated postretirement benefit obligation 0.4 0.4 Expected return on plan assets (1.2 ) (1.3 ) Amortization of prior service (credit) cost (0.1 ) 0.1 Amortization of actuarial gain (0.1 ) — Subtotal (0.8 ) (0.5 ) Regulatory adjustment (0.5 ) (0.5 ) Net postretirement benefit income $ (1.3 ) $ (1.0 )

Note 9 - Information by Opera_2

Note 9 - Information by Operating Segment (Tables)	3 Months Ended
	Dec. 31, 2022
Notes Tables
Schedule of Segment Reporting Information, by Segment [Table Text Block]	Gas Utility Gas Marketing Midstream Other Eliminations Consolidated Three Months Ended December 31, 2022 Operating Revenues: Revenues from external customers $ 733.0 $ 74.1 $ 6.8 $ 0.1 $ — $ 814.0 Intersegment revenues — — 8.4 3.9 (12.3 ) — Total Operating Revenues 733.0 74.1 15.2 4.0 (12.3 ) 814.0 Operating Expenses: Natural gas 401.6 26.0 — — (8.4 ) 419.2 Operation and maintenance 119.9 6.3 5.8 4.0 (3.9 ) 132.1 Depreciation and amortization 59.7 0.3 1.9 0.2 — 62.1 Taxes, other than income taxes 49.9 0.1 0.4 — — 50.4 Total Operating Expenses 631.1 32.7 8.1 4.2 (12.3 ) 663.8 Operating Income (Loss) $ 101.9 $ 41.4 $ 7.1 $ (0.2 ) $ — $ 150.2 Net Economic Earnings (Loss) $ 62.9 $ 25.7 $ 3.8 $ (7.3 ) $ — $ 85.1 Gas Utility Gas Marketing Midstream Other Eliminations Consolidated Three Months Ended December 31, 2021 Operating Revenues: Revenues from external customers $ 503.5 $ 47.9 $ 3.8 $ 0.2 $ — $ 555.4 Intersegment revenues — — 9.1 3.5 (12.6 ) — Total Operating Revenues 503.5 47.9 12.9 3.7 (12.6 ) 555.4 Operating Expenses: Natural gas 210.2 48.0 — — (9.0 ) 249.2 Operation and maintenance 107.3 2.7 5.8 4.2 (3.6 ) 116.4 Depreciation and amortization 54.6 0.3 1.9 0.1 — 56.9 Taxes, other than income taxes 37.0 — 0.6 — — 37.6 Total Operating Expenses 409.1 51.0 8.3 4.3 (12.6 ) 460.1 Operating Income (Loss) $ 94.4 $ (3.1 ) $ 4.6 $ (0.6 ) $ — $ 95.3 Net Economic Earnings (Loss) $ 67.2 $ 0.5 $ 2.5 $ (7.6 ) $ — $ 62.6
Reconciliation Of Consolidated Net Economic Earnings To Consolidated Net Income [Table Text Block]	Three Months Ended December 31, 2022 2021 Net Income $ 91.0 $ 55.7 Adjustments, pre-tax: Fair value and timing adjustments (7.8 ) 3.7 Income tax adjustments 1.9 3.2 Net Economic Earnings $ 85.1 $ 62.6
Reconciliation of Assets from Segment to Consolidated [Table Text Block]	December 31, September 30, December 31, 2022 2022 2021 Total Assets: Gas Utility $ 8,355.1 $ 8,042.8 $ 7,882.1 Gas Marketing 492.4 638.7 424.4 Midstream 466.6 446.0 421.7 Other 2,882.8 2,449.2 1,995.9 Eliminations (1,869.2 ) (1,493.0 ) (1,073.6 ) Total Assets $ 10,327.7 $ 10,083.7 $ 9,650.5

Note 1 - Summary of Significa_3

Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Millions	Dec. 31, 2022	Sep. 30, 2022
Restricted Cash, Total	$ 14.2	$ 14

Note 1 - Summary of Significa_4

Note 1 - Summary of Significant Accounting Policies - Transactions With Affiliates (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Spire Missouri [Member] | Spire Marketing Incorporation [Member]
Purchases of natural gas from Spire Marketing Inc.	$ 28.5	$ 18.2
Spire Missouri [Member] | Spire S T L Pipeline L L C [Member]
Transportation services received	8.1	8.1
Spire Alabama Inc [Member] | Spire Marketing Incorporation [Member]
Purchases of natural gas from Spire Marketing Inc.	$ 1.1	$ 0

Note 1 - Summary of Significa_5

Note 1 - Summary of Significant Accounting Policies - Accrued Capital Expenditures Excluded From Capital Expenditures in the Statements of Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Sep. 30, 2022
Accrued capital expenditures	$ 63.1	$ 33.5	$ 77.8
Spire Missouri [Member]
Accrued capital expenditures	32.8	27.2	45.6
Spire Alabama Inc [Member]
Accrued capital expenditures	$ 9.4	$ 1.2	$ 19.2

Note 1 - Summary of Significa_6

Note 1 - Summary of Significant Accounting Policies - Activity in the Allowance for Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Allowance at beginning of period	$ 31.9	$ 30.3
Provision for expected credit losses	4.1	1.5
Write-offs, net of recoveries	(1.5)	(0.4)
Allowance at end of period	34.5	31.4
Spire Missouri [Member]
Allowance at beginning of period	24.9	22.6
Provision for expected credit losses	3.8	2.1
Write-offs, net of recoveries	(0.5)	(0.9)
Allowance at end of period	28.2	23.8
Spire Alabama Inc [Member]
Allowance at beginning of period	6.3	6.6
Provision for expected credit losses	0.2	(0.5)
Write-offs, net of recoveries	(1)	0.6
Allowance at end of period	$ 5.5	$ 6.7

Note 2 - Revenue - Disaggregate

Note 2 - Revenue - Disaggregated of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Operating Revenues	$ 814	$ 814	$ 555.4	$ 555.4
Consolidation, Eliminations [Member]
Operating Revenues	(12.3)		(12.6)
Gas Utility [Member] | Operating Segments [Member]
Operating Revenues	733		503.5
Gas Marketing [Member] | Operating Segments [Member]
Operating Revenues	74.1		47.9
Midstream [Member] | Operating Segments [Member]
Operating Revenues	15.2		12.9
Other Segments [Member]
Operating Revenues	4		3.7
Spire Missouri [Member]
Operating Revenues	541.2		347.9
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member]
Revenue	539.7		331.3
Changes in accrued revenue under alternative revenue programs	1.5		16.6
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member] | Residential [Member]
Revenue	400.6		247.1
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member] | Commercial and Industrial [Member]
Revenue	122.9		68.2
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member] | Transportation [Member]
Revenue	9.1		9.2
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member] | Off-system and Other Incentive [Member]
Revenue	5.1		4.5
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member] | Other Customer Revenue [Member]
Revenue	2		2.3
Spire Alabama Inc [Member]
Operating Revenues	152.4		126.6
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member]
Revenue	152.8		126.7
Changes in accrued revenue under alternative revenue programs	(0.4)		(0.1)
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member] | Residential [Member]
Revenue	96.3		80.1
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member] | Commercial and Industrial [Member]
Revenue	33.6		26
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member] | Transportation [Member]
Revenue	19.3		19.4
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member] | Off-system and Other Incentive [Member]
Revenue	2.4		0.4
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member] | Other Customer Revenue [Member]
Revenue	1.2		0.8
Spire [Member]
Operating Revenues	814		555.4
Spire [Member] | Operating Segments [Member]
Operating Revenues	826.3		568
Spire [Member] | Consolidation, Eliminations [Member]
Operating Revenues	(12.3)
Spire [Member] | Segment Reconciling Items [Member]
Operating Revenues			(12.6)
Spire [Member] | Gas Utility [Member] | Operating Segments [Member]
Revenue	731.5		485.4
Changes in accrued revenue under alternative revenue programs	1.5		18.1
Total Gas Utility operating revenues	733		503.5
Spire [Member] | Gas Utility [Member] | Operating Segments [Member] | Residential [Member]
Revenue	518		342
Spire [Member] | Gas Utility [Member] | Operating Segments [Member] | Commercial and Industrial [Member]
Revenue	170.6		103.8
Spire [Member] | Gas Utility [Member] | Operating Segments [Member] | Transportation [Member]
Revenue	30.9		31.2
Spire [Member] | Gas Utility [Member] | Operating Segments [Member] | Off-system and Other Incentive [Member]
Revenue	7.6		4.8
Spire [Member] | Gas Utility [Member] | Operating Segments [Member] | Other Customer Revenue [Member]
Revenue	4.4		3.6
Spire [Member] | Gas Marketing [Member] | Operating Segments [Member]
Unregulated Operating Revenue	74.1		47.9
Spire [Member] | Midstream [Member] | Operating Segments [Member]
Unregulated Operating Revenue	15.2		12.9
Spire [Member] | Other Segments [Member] | Operating Segments [Member]
Unregulated Operating Revenue	$ 4		$ 3.7

Note 2 - Revenue - Taxes Associ

Note 2 - Revenue - Taxes Associated With Natural Gas Utility Services (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Gross Receipts Tax Amounts	$ 30.4	$ 21.9
Spire Missouri [Member]
Gross Receipts Tax Amounts	22.1	14.9
Spire Alabama Inc [Member]
Gross Receipts Tax Amounts	$ 6.8	$ 5.7

Note 3 - Earnings Per Common _3

Note 3 - Earnings Per Common Share - Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended
		Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Net Income		$ 91	$ 91	$ 55.7	$ 55.7
Provision for preferred dividends		3.7	3.7	3.7	3.7
Income allocated to participating securities		0.1	0.1	0.1	0.1
Income Available to Common Shareholders		$ 87.2	$ 87.2	$ 51.9	$ 51.9
Basic (in shares)		52.4	52.4	51.6	51.6
Basic Earnings Per Common Share (in dollars per share)		$ 1.66	$ 1.66	$ 1.01	$ 1.01
Dilutive Effect of Restricted Stock and Restricted Stock Units (in millions)* (in shares)	[1]	0.2		0.1
Weighted Average Diluted Common Shares (in millions) (in shares)		52.6	52.6	51.7	51.7
Diluted Earnings Per Common Share (in dollars per share)		$ 1,660,000	$ 1.66	$ 1,010,000	$ 1.01
* Calculation excludes certain outstanding common shares (shown in millions by period at the right) attributable to stock units subject to performance or market conditions and restricted stock, which could have a dilutive effect in the future (in shares)		0.2		0.2
[1]Calculation excludes certain outstanding common shares (shown in millions by period at the right) attributable to stock units subject to performance or market conditions and restricted stock, which could have a dilutive effect in the future

Note 4 - Regulatory Matters (De

Note 4 - Regulatory Matters (Details Textual) - USD ($) $ in Millions

1 Months Ended

3 Months Ended

Jan. 18, 2023

Dec. 27, 2022

Nov. 18, 2022

Sep. 14, 2022

Dec. 23, 2021

Oct. 31, 2022

Feb. 28, 2021

Dec. 31, 2022

Sep. 30, 2022

Mar. 31, 2022

Dec. 31, 2021

Sep. 30, 2021

Jan. 25, 2023

Utilities Operating Expense, Gas and Petroleum Purchased

$ 419.2

$ 419.2

$ 249.2

$ 249.2

Missouri Public Service Commission [Member] | Infrastructure System Replacement Surcharge [Member]

Public Utilities, Requested Rate Increase (Decrease), Amount

$ 47.3

Spire Missouri [Member]

Utilities Operating Expense, Gas and Petroleum Purchased

$ 195.8

$ 316.7

$ 156.3

Public Utilities, Reduced Revenue Accounts Receivable Cost Of Gas and Regulatory Liabilities

$ 150

Utilities Operating, Due From Other Parties

$ 42

Spire Missouri [Member] | Missouri Public Service Commission [Member]

Public Utilities, Approved Rate Increase (Decrease), Amount

72.2

Public Utilities, Requested Rate Increase (Decrease), Amount

$ 24.9

Public Utilities, Deferred Amount Under Order Authorizing Accounting Treatment

42.8

Deferred Amount in Accordance With New Capitalization Rates

19

Public Utilities, Deferred Amount Prudent Costs in Excess of Capitalization Rates

18.8

Deferred Amount, Prudent Costs Related To I S R S Settlement

$ 5

Public Utilities New Annualized Base Rate Revenue Authorized

$ 78

Public Utilities, Incremental Annualized Revenue Per ISRS Filing

$ 8.8

Spire Missouri [Member] | Missouri Public Service Commission [Member] | Subsequent Event [Member]

Public Utilities, Disallowance From ACA Balance

$ 0.6

Spire Gulf [Member]

Public Utilities, Approved Return on Equity, Percentage

9.95%

Public Utilities, Approved Rate, Increase Decrease Annualized Revenue

$ 2.5

Spire Mississippi [Member]

Public Utilities, Approved Rate Increase (Decrease), Amount

$ 1.3

Spire Mississippi [Member] | Subsequent Event [Member]

Public Utilities, Approved Rate, Increase Decrease Annualized Revenue

$ 0.8

Future Income Taxes Due From Customers and Pension and Other Postretirement Benefit Costs [Member]

Remaining Recovery Period of Regulatory Assets for which No Return on Investment During Recovery Period is Provided (Year)

20 years

PGA Assets Not Earning A Return [Member]

Remaining Recovery Period of Regulatory Assets for which No Return on Investment During Recovery Period is Provided (Year)

15 years

Note 4 - Regulatory Matters - R

Note 4 - Regulatory Matters - Regulatory Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Regulatory assets	$ 269.1	$ 355.4	$ 265.7
Regulatory Assets Noncurrent	1,220.7	1,112.4	1,089.9
Total Regulatory Assets	1,489.8	1,467.8	1,355.6
Regulatory liabilities	3.7	3.7	4.1
Regulatory Liability Noncurrent	344.9	418.2	531.8
Total Regulatory Liabilities	348.6	421.9	535.9
Spire Missouri [Member]
Regulatory assets	191.2	288.1	236.9
Regulatory Assets Noncurrent	634.7	547.6	560.5
Total Regulatory Assets	825.9	835.7	797.4
Regulatory liabilities	0	0	0.2
Regulatory Liability Noncurrent	259	331.8	447.2
Total Regulatory Liabilities	259	331.8	447.4
Spire Alabama Inc [Member]
Regulatory assets	67.3	56.9	14.6
Regulatory Assets Noncurrent	560.4	538.2	501.7
Total Regulatory Assets	627.7	595.1	516.3
Regulatory liabilities	0	0	0.8
Regulatory Liability Noncurrent	22.2	23	25.3
Total Regulatory Liabilities	22.2	23	26.1
Unamortized Purchased Gas Adjustments Asset [Member]
Regulatory assets	238.9	322.2	242.4
Regulatory Assets Noncurrent	107.9	0	27.3
Regulatory liabilities	0	53	155
Unamortized Purchased Gas Adjustments Asset [Member] | Spire Missouri [Member]
Regulatory assets	181.2	275.1	235.2
Regulatory Assets Noncurrent	107.9	0	27.3
Regulatory liabilities	0	53	155
Unamortized Purchased Gas Adjustments Asset [Member] | Spire Alabama Inc [Member]
Regulatory assets	54.5	43.8	4.1
Other Regulatory Assets (Liabilities) [Member]
Regulatory assets	30.2	33.2	23.3
Regulatory Assets Noncurrent	131.7	129.2	94.7
Regulatory liabilities	3.7	3.7	4.1
Regulatory Liability Noncurrent	13.7	14.4	13.8
Other Regulatory Assets (Liabilities) [Member] | Spire Missouri [Member]
Regulatory assets	10	13	1.7
Regulatory Assets Noncurrent	116.3	113.1	77.8
Regulatory liabilities	0	0	0.2
Regulatory Liability Noncurrent	7	7.3	8.1
Other Regulatory Assets (Liabilities) [Member] | Spire Alabama Inc [Member]
Regulatory assets	12.8	13.1	10.5
Regulatory Assets Noncurrent	1	1	1.2
Regulatory liabilities	0	0	0.8
Regulatory Liability Noncurrent	3.5	3.6	3.7
Pension and Other Postretirement Plans Costs [Member]
Regulatory assets	277.3	294.5	335.9
Regulatory Assets Noncurrent	156.6	172.6	172.2
Pension and Other Postretirement Plans Costs [Member] | Spire Missouri [Member]
Regulatory assets	197.4	222.9	241.6
Regulatory Assets Noncurrent	127.4	143.6	142.6
Pension and Other Postretirement Plans Costs [Member] | Spire Alabama Inc [Member]
Regulatory assets	75.1	66.5	88.7
Regulatory Assets Noncurrent	18.7	19.4	21.6
Deferred Income Tax Charge [Member]
Regulatory Assets Noncurrent	138.6	137.8	135.5
Deferred Income Tax Charge [Member] | Spire Missouri [Member]
Regulatory Assets Noncurrent	130.1	129.2	126.9
Deferred Income Tax Charge [Member] | Spire Alabama Inc [Member]
Regulatory Assets Noncurrent	2.1	2.2	2.2
Removal Costs [Member]
Regulatory Assets Noncurrent	506.1	493.7	444.5
Regulatory Liability Noncurrent	33.7	32.9	35.3
Removal Costs [Member] | Spire Missouri [Member]
Regulatory Assets Noncurrent	23.9	25.2	34.9
Regulatory Liability Noncurrent	0	0	3.3
Removal Costs [Member] | Spire Alabama Inc [Member]
Regulatory Assets Noncurrent	482.2	468.5	409.6
Renewable Energy Program [Member]
Regulatory Assets Noncurrent	59.1	57.2	52
Renewable Energy Program [Member] | Spire Missouri [Member]
Regulatory Assets Noncurrent	59.1	57.2	52
Estimated Deferred Taxes Due to Customers [Member]
Regulatory Liability Noncurrent	140.9	145.3	155.5
Estimated Deferred Taxes Due to Customers [Member] | Spire Missouri [Member]
Regulatory Liability Noncurrent	$ 124.6	$ 127.9	$ 138.2

Note 4 - Regulatory Matters -_2

Note 4 - Regulatory Matters - Regulatory Assets Not Earning a Return (Details) - USD ($) $ in Millions	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Regulatory assets not earning a return	$ 675.4	$ 686.3	$ 666.6
Spire Missouri [Member]
Regulatory assets not earning a return	669.1	679.9	660.2
Pension and Other Postretirement Plans Costs [Member]
Regulatory assets not earning a return	127	152.9	163.4
Pension and Other Postretirement Plans Costs [Member] | Spire Missouri [Member]
Regulatory assets not earning a return	127	152.9	163.4
Deferred Income Tax Charge [Member]
Regulatory assets not earning a return	136.4	135.6	133.3
Deferred Income Tax Charge [Member] | Spire Missouri [Member]
Regulatory assets not earning a return	130.1	129.2	126.9
Unamortized Purchased Gas Adjustments Asset [Member]
Regulatory assets not earning a return	289.1	275.1	262.5
Unamortized Purchased Gas Adjustments Asset [Member] | Spire Missouri [Member]
Regulatory assets not earning a return	289.1	275.1	262.5
Other Regulatory Assets (Liabilities) [Member]
Regulatory assets not earning a return	122.9	122.7	107.4
Other Regulatory Assets (Liabilities) [Member] | Spire Missouri [Member]
Regulatory assets not earning a return	$ 122.9	$ 122.7	$ 107.4

Note 5 - Financing (Details Tex

Note 5 - Financing (Details Textual) - USD ($) $ in Thousands		1 Months Ended
	Jan. 05, 2023	Mar. 31, 2021	Dec. 31, 2022	Oct. 13, 2022	Jul. 22, 2022
Commercial Paper [Member]
Short-term Borrowing, Maximum Aggregate Principal Amount					$ 1,300,000
Commercial Paper [Member] | Parent Company [Member]
Short Term Borrowings Used to Support Lending to Utilities			$ 843,400
Spire Missouri [Member] | Unsecured Term Loan [Member]
Debt Instrument, Face Amount		$ 250,000
Debt Instrument, Term (Day)		364 days
Spire Missouri [Member] | Unsecured Term Loan [Member] | Subsequent Event [Member]
Debt Instrument, Face Amount	$ 250,000
Debt Instrument, Interest Rate, Stated Percentage	0.10%
Spire Missouri [Member] | Unsecured Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] (Deprecated 2023)
Line of Credit Facility, Covenant, Percentage of Total Capitalization			65%
Debt Instrument, Basis Spread on Variable Rate		0.65%
Spire Missouri [Member] | Unsecured Term Loan [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] | Subsequent Event [Member]
Debt Instrument, Basis Spread on Variable Rate	0.80%
Spire Gulf [Member] | Notes Due October 15, 2029 [Member]
Debt Instrument, Interest Rate, Stated Percentage				5.32%
Long-Term Debt, Gross				$ 90,000
Spire Gulf [Member] | Notes Due October 15, 2032 [Member]
Debt Instrument, Interest Rate, Stated Percentage				5.41%
Long-Term Debt, Gross				$ 85,000
Spire Gulf [Member] | First Mortgage Bonds Due October 15, 2037 [Member]
Debt Instrument, Interest Rate, Stated Percentage				5.61%
Long-Term Debt, Gross				$ 30,000
Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity					1,300,000
Long-Term Line of Credit, Total			$ 0
Revolving Credit Facility [Member] | Maximum [Member]
Line of Credit Facility, Covenant, Percentage of Total Capitalization			70%
Revolving Credit Facility [Member] | Spire [Member]
Line of Credit Facility, Maximum Borrowing Capacity					450,000
Revolving Credit Facility [Member] | Spire Missouri [Member]
Line of Credit Facility, Maximum Borrowing Capacity					575,000
Revolving Credit Facility [Member] | Spire Alabama Inc [Member]
Line of Credit Facility, Maximum Borrowing Capacity					$ 275,000

Note 5 - Financing - Short-term

Note 5 - Financing - Short-term Borrowings (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Highest borrowings outstanding	$ 1,230
Lowest borrowings outstanding	829.5
Weighted average borrowings	$ 1,071.3
Weighted average interest rate	4.40%
Borrowings outstanding	$ 1,227	$ 1,037.5	$ 846
Weighted average interest rate	4.90%	3.30%	0.50%
Spire Missouri [Member] | Term Loan [Member]
Highest borrowings outstanding	$ 0
Lowest borrowings outstanding	0
Weighted average borrowings	0
Borrowings outstanding	0	$ 0	$ 250
Weighted average interest rate		0%	0.70%
Spire Missouri [Member] | Spire Note [Member]
Highest borrowings outstanding	651.2
Lowest borrowings outstanding	439.6
Weighted average borrowings	$ 529.6
Weighted average interest rate	4.30%
Borrowings outstanding	$ 651.2	$ 445.3	$ 180.4
Weighted average interest rate	4.90%	3.30%	0.40%
Spire Alabama Inc [Member] | Spire Note [Member]
Highest borrowings outstanding	$ 274
Lowest borrowings outstanding	76.7
Weighted average borrowings	$ 138.3
Weighted average interest rate	4.20%
Borrowings outstanding	$ 145.8	$ 260.9	$ 173.7
Weighted average interest rate	4.90%	3.30%	0.40%
Commercial Paper [Member] | Parent Company [Member]
Highest borrowings outstanding	$ 1,230
Lowest borrowings outstanding	829.5
Weighted average borrowings	$ 1,071.3
Weighted average interest rate	4.40%
Borrowings outstanding	$ 1,227	$ 1,037.5	$ 596
Weighted average interest rate	4.90%	3.30%	0.40%

Note 5 - Financing - Capitalize

Note 5 - Financing - Capitalized Interest Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Interest Paid Capitalized	$ 1.6	$ 1.1
Spire Missouri [Member]
Interest Paid Capitalized	0.5	0
Spire Alabama Inc [Member]
Interest Paid Capitalized	$ 0.7	$ 0.8

Note 6 - Fair Value of Financ_3

Note 6 - Fair Value of Financial Instruments - Estimated Fair Value of Financial Instruments Not Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Reported Value Measurement [Member]
Cash and cash equivalents	$ 4.8	$ 6.5	$ 8.2
Notes payable	1,227	1,037.5	846
Long-term debt, including current portion	3,412.9	3,239.7	3,238
Reported Value Measurement [Member] | Spire Missouri [Member]
Notes payable			250
Long-term debt, including current portion	1,638.1	1,637.7	1,637
Notes payable – associated companies	651.2	445.3	180.4
Reported Value Measurement [Member] | Spire Alabama Inc [Member]
Cash and cash equivalents		2.4
Long-term debt, including current portion	745.6	571.5	571.3
Notes payable – associated companies	145.8	260.9	173.7
Estimate of Fair Value Measurement [Member]
Cash and cash equivalents	4.8	6.5	8.2
Notes payable	1,227	1,037.5	846
Long-term debt, including current portion	3,083.7	2,851.8	3,594.4
Estimate of Fair Value Measurement [Member] | Spire Missouri [Member]
Notes payable			250
Long-term debt, including current portion	1,497.7	1,473.9	1,830.5
Notes payable – associated companies	651.2	445.3	180.4
Estimate of Fair Value Measurement [Member] | Spire Alabama Inc [Member]
Cash and cash equivalents		2.4
Long-term debt, including current portion	674.5	485	653.6
Notes payable – associated companies	145.8	260.9	173.7
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	4.8	6.5	8.2
Notes payable	0	0	0
Long-term debt, including current portion	0	0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Spire Missouri [Member]
Notes payable			0
Long-term debt, including current portion	0	0	0
Notes payable – associated companies	0	0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Spire Alabama Inc [Member]
Cash and cash equivalents		2.4
Long-term debt, including current portion	0	0	0
Notes payable – associated companies	0	0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents	0	0	0
Notes payable	1,227	1,037.5	846
Long-term debt, including current portion	3,083.7	2,851.8	3,594.4
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Spire Missouri [Member]
Notes payable			250
Long-term debt, including current portion	1,497.7	1,473.9	1,830.5
Notes payable – associated companies	651.2	445.3	180.4
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Spire Alabama Inc [Member]
Cash and cash equivalents		0
Long-term debt, including current portion	674.5	485	653.6
Notes payable – associated companies	$ 145.8	$ 260.9	$ 173.7

Note 7 - Fair Value Measureme_3

Note 7 - Fair Value Measurements - Schedule of Derivative Assets and Liabilities, Including Receivables and Payables (Details) - USD ($) $ in Millions	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Gasoline And Heating Oil Contracts [Member] | Parent Company [Member] | Term Loan [Member]
Derivative Asset Fair Value Gross Asset	$ 0
Derivative Liability Fair Value Gross Liability	0
Gasoline And Heating Oil Contracts [Member] | Commercial Paper [Member] | Parent Company [Member]
Derivative Asset Fair Value Gross Asset	0.2
Derivative Liability Fair Value Gross Liability	0.2
Spire Missouri [Member] | Gasoline And Heating Oil Contracts [Member] | Term Loan [Member]
Effects of netting, asset	(0.2)
Effects of netting, liability	(0.2)
Spire Missouri [Member] | Gasoline And Heating Oil Contracts [Member] | Spire Note [Member]
Derivative Assets	0
Derivative Liabilities	0
Fair Value, Recurring [Member]
Effects of netting, asset	(65.8)	$ (153.6)	$ (77.3)
Derivative Assets	188.9	164.6	91.3
Effects of netting, liability	(107.5)	(117)	(56.7)
Derivative Liabilities	58.7	61.5	77.3
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative Asset Fair Value Gross Asset	254.7	318.2	61.2
Derivative Liability Fair Value Gross Liability	166.2	178.5	15.9
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative Asset Fair Value Gross Asset	0	0	107.4
Derivative Liability Fair Value Gross Liability	0	0	118.1
Fair Value, Recurring [Member] | Spire Missouri [Member]
Effects of netting, asset	(0.6)	(57.8)	(2.4)
Derivative Assets	19.5	19.1	24.8
Effects of netting, liability	(35.9)
Derivative Liabilities	0
Fair Value, Recurring [Member] | Spire Missouri [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative Asset Fair Value Gross Asset	20.1	76.9	27.2
Derivative Liability Fair Value Gross Liability	35.9
Fair Value, Recurring [Member] | Spire Missouri [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative Asset Fair Value Gross Asset	0	0	0
Derivative Liability Fair Value Gross Liability	0
U S Stock And Bond Mutual Funds [Member] | Fair Value, Recurring [Member] | Gas Utility [Member]
Effects of netting, asset	0	0	0
Derivative Assets	19.5	19.1	24.8
U S Stock And Bond Mutual Funds [Member] | Fair Value, Recurring [Member] | Other Segments [Member]
Effects of netting, asset	0	0	0
Derivative Assets	28.3	29.3	24.6
U S Stock And Bond Mutual Funds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Gas Utility [Member]
Derivative Asset Fair Value Gross Asset	19.5	19.1	24.8
U S Stock And Bond Mutual Funds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other Segments [Member]
Derivative Asset Fair Value Gross Asset	28.3	29.3	24.6
U S Stock And Bond Mutual Funds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Gas Utility [Member]
Derivative Asset Fair Value Gross Asset	0	0	0
U S Stock And Bond Mutual Funds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Segments [Member]
Derivative Asset Fair Value Gross Asset	0	0	0
U S Stock And Bond Mutual Funds [Member] | Fair Value, Recurring [Member] | Spire Missouri [Member]
Effects of netting, asset	0	0	0
Derivative Assets	19.5	19.1	24.8
U S Stock And Bond Mutual Funds [Member] | Fair Value, Recurring [Member] | Spire Missouri [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative Asset Fair Value Gross Asset	19.5	19.1	24.8
U S Stock And Bond Mutual Funds [Member] | Fair Value, Recurring [Member] | Spire Missouri [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative Asset Fair Value Gross Asset	0	0	0
N Y M E X I C E Natural Gas Contracts [Member] | Fair Value, Recurring [Member]
Effects of netting, liability			(8.6)
Derivative Liabilities			0
N Y M E X I C E Natural Gas Contracts [Member] | Fair Value, Recurring [Member] | Gas Utility [Member]
Effects of netting, asset	(0.4)	(57.8)	(2.4)
Derivative Assets	0	0	0
Effects of netting, liability	(35.7)	(30.7)	(8.6)
Derivative Liabilities	0	0	0
N Y M E X I C E Natural Gas Contracts [Member] | Fair Value, Recurring [Member] | Gas Marketing [Member]
Effects of netting, asset	(52)	(91.8)	(67)
Derivative Assets	0	0	0
Effects of netting, liability	(58.4)	(82.3)	(40.2)
Derivative Liabilities	0	0	0
N Y M E X I C E Natural Gas Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative Liability Fair Value Gross Liability			8.6
N Y M E X I C E Natural Gas Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Gas Utility [Member]
Derivative Asset Fair Value Gross Asset	0.4	57.8	2.4
Derivative Liability Fair Value Gross Liability	35.7	30.7	8.6
N Y M E X I C E Natural Gas Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Gas Marketing [Member]
Derivative Asset Fair Value Gross Asset	52	91.8	0
Derivative Liability Fair Value Gross Liability	58.4	82.3	0
N Y M E X I C E Natural Gas Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative Liability Fair Value Gross Liability			0
N Y M E X I C E Natural Gas Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Gas Utility [Member]
Derivative Asset Fair Value Gross Asset	0	0	0
Derivative Liability Fair Value Gross Liability	0	0	0
N Y M E X I C E Natural Gas Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Gas Marketing [Member]
Derivative Asset Fair Value Gross Asset	0	0	67
Derivative Liability Fair Value Gross Liability	0	0	40.2
N Y M E X I C E Natural Gas Contracts [Member] | Fair Value, Recurring [Member] | Spire Missouri [Member]
Effects of netting, asset	(0.4)	(57.8)	(2.4)
Derivative Assets	0	0	0
Effects of netting, liability	(35.7)	(30.7)
Derivative Liabilities	0	0
N Y M E X I C E Natural Gas Contracts [Member] | Fair Value, Recurring [Member] | Spire Missouri [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative Asset Fair Value Gross Asset	0.4	57.8	2.4
Derivative Liability Fair Value Gross Liability	35.7	30.7
N Y M E X I C E Natural Gas Contracts [Member] | Fair Value, Recurring [Member] | Spire Missouri [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative Asset Fair Value Gross Asset	0	0	0
Derivative Liability Fair Value Gross Liability	0	0
Gasoline And Heating Oil Contracts [Member] | Spire Missouri [Member] | Estimate of Fair Value Measurement [Member]
Effects of netting, liability	(0.2)
Derivative Liabilities	0
Gasoline And Heating Oil Contracts [Member] | Spire Missouri [Member] | Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member]
Derivative Liability Fair Value Gross Liability	0.2
Gasoline And Heating Oil Contracts [Member] | Spire Missouri [Member] | Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]
Derivative Liability Fair Value Gross Liability	0
Gasoline And Heating Oil Contracts [Member] | Fair Value, Recurring [Member] | Spire Missouri [Member]
Effects of netting, asset	(0.2)
Derivative Assets	0
Gasoline And Heating Oil Contracts [Member] | Fair Value, Recurring [Member] | Spire Missouri [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative Asset Fair Value Gross Asset	0.2
Gasoline And Heating Oil Contracts [Member] | Fair Value, Recurring [Member] | Spire Missouri [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative Asset Fair Value Gross Asset	0
Natural Gas Commodity Contracts [Member] | Fair Value, Recurring [Member] | Gas Marketing [Member]
Effects of netting, asset	(13.2)	(4)	(2.3)
Derivative Assets	79.7	52.6	38.1
Effects of netting, liability	(13.2)	(4)	(2.3)
Derivative Liabilities	57.9	61.5	75.6
Natural Gas Commodity Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Gas Marketing [Member]
Derivative Asset Fair Value Gross Asset	92.9	56.6	0
Derivative Liability Fair Value Gross Liability	71.1	65.5	0
Natural Gas Commodity Contracts [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Gas Marketing [Member]
Derivative Asset Fair Value Gross Asset	0	0	40.4
Derivative Liability Fair Value Gross Liability	0	0	77.9
Interest Rate Swap [Member] | Fair Value, Recurring [Member]
Effects of netting, asset			(5.6)
Derivative Assets			3.8
Interest Rate Swap [Member] | Fair Value, Recurring [Member] | Other Segments [Member]
Effects of netting, asset	0	0
Derivative Assets	61.4	63.6
Effects of netting, liability	0		(5.6)
Derivative Liabilities	0.8		1.7
Interest Rate Swap [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative Asset Fair Value Gross Asset			9.4
Interest Rate Swap [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other Segments [Member]
Derivative Asset Fair Value Gross Asset	61.4	63.6
Derivative Liability Fair Value Gross Liability	0.8		7.3
Interest Rate Swap [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative Asset Fair Value Gross Asset			0
Interest Rate Swap [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Segments [Member]
Derivative Asset Fair Value Gross Asset	0	$ 0
Derivative Liability Fair Value Gross Liability	$ 0		$ 0

Note 8 - Pension Plans and Ot_3

Note 8 - Pension Plans and Other Postretirement Benefits (Details Textual) - USD ($) $ in Thousands			3 Months Ended		9 Months Ended	12 Months Ended
	Dec. 23, 2021	Dec. 22, 2021	Dec. 31, 2022	Dec. 31, 2021	Jun. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement			$ 0	$ 0
Regulatory Asset, Total			1,489,800	1,355,600			$ 1,467,800
Spire Alabama Inc [Member]
Regulatory Asset, Total			627,700	516,300			$ 595,100
Spire Alabama Inc [Member] | Pension Plan [Member]
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement			27,500
Defined Benefit Plan, Benefit Obligation, Payment for Settlement			8,600
Defined Benefit Plan, Plan Assets, Contributions by Employer			13,000
Anticipated Contributions to Pension Plans Qualified Trusts			$ 27,800
Spire Alabama Inc [Member] | Pension Plan One [Member]
Defined Benefit Plan, Benefit Obligation, Settlement Losses Amortized Over Remaining Actuarial Life (Year)			13 years 4 months 24 days
Spire Alabama Inc [Member] | Pension Plan Two [Member]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate							5.65%
Defined Benefit Plan, Benefit Obligation, Settlement Losses Amortized Over Remaining Actuarial Life (Year)			12 years 4 months 24 days
Spire Alabama Inc [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer					$ 0
Anticipated Contributions to Pension Plans Qualified Trusts					$ 0
Spire Missouri [Member]
Regulatory Asset, Total			$ 825,900	$ 797,400			$ 835,700
Spire Missouri [Member] | Pension Costs [Member] | Missouri West [Member]
Regulatory Asset, Total	$ 4,400	$ 5,500
Spire Missouri [Member] | Pension Costs [Member] | Missouri East [Member]
Regulatory Asset, Total	32,400	29,000
Spire Missouri [Member] | Pension and Other Postretirement Plans Costs [Member] | Missouri West [Member]
Regulatory Assets for Which No Return on Investment During Recovery Period Is Provided	$ 1,100	$ 3,300
Remaining Recovery Period of Regulatory Assets for which No Return on Investment During Recovery Period is Provided (Year)		8 years
Additional Remaining Recovery Period of Regulatory Assets for Which No Return on Investment During Recovery Period Is Provided (Year)	8 years
Spire Missouri [Member] | Pension and Other Postretirement Plans Costs [Member] | Missouri East [Member]
Regulatory Assets for Which No Return on Investment During Recovery Period Is Provided	$ 11,000	$ 21,600
Remaining Recovery Period of Regulatory Assets for which No Return on Investment During Recovery Period is Provided (Year)		8 years
Additional Remaining Recovery Period of Regulatory Assets for Which No Return on Investment During Recovery Period Is Provided (Year)	8 years
Spire Missouri [Member] | Pension Plan [Member]
Anticipated Contributions to Pension Plans Qualified Trusts			800
Spire Missouri [Member] | Pension Plan [Member] | Qualified Plan [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer			16,700
Spire Missouri [Member] | Pension Plan [Member] | Nonqualified Plan [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer			$ 0
Spire Missouri [Member] | Pension Plan One [Member]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate			5.60%				5.70%
Spire Missouri [Member] | Other Postretirement Benefits Plan [Member]
Postretirement Benefit Plans, Recovery in Rates Base Allowance	$ 8,600
Spire Missouri [Member] | Other Postretirement Benefits Plan [Member] | Forecast [Member]
Anticipated Contributions to Pension Plans Qualified Trusts						$ 0

Note 8 - Pension Plans and Ot_4

Note 8 - Pension Plans and Other Postretirement Benefits - Net Pension Costs (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Pension Plan [Member]
Service cost – benefits earned during the period	$ 4.1	$ 5.4
Interest cost on projected benefit obligation	6.4	5.1
Expected return on plan assets	(6.4)	(8.2)
Amortization of prior service credit	(1.1)	(1.1)
Amortization of actuarial loss	1.6	3.7
Loss on lump-sum settlements	8.6	0
Subtotal	13.2	4.9
Regulatory adjustment	1.8	10.6
Net pension cost	15	15.5
Pension Plan [Member] | Spire Missouri [Member]
Service cost – benefits earned during the period	2.8	3.9
Interest cost on projected benefit obligation	4.5	3.5
Expected return on plan assets	(4.5)	(6)
Amortization of prior service credit	(0.5)	(0.5)
Amortization of actuarial loss	1.5	2.8
Loss on lump-sum settlements	8.6	0
Subtotal	3.8	3.7
Regulatory adjustment	8.1	8.5
Net pension cost	11.9	12.2
Pension Plan [Member] | Spire Alabama Inc [Member]
Service cost – benefits earned during the period	1.1	1.4
Interest cost on projected benefit obligation	1.3	1.1
Expected return on plan assets	(1.1)	(1.4)
Amortization of prior service credit	(0.6)	(0.6)
Amortization of actuarial loss	0.1	0.9
Subtotal	9.4	1.4
Regulatory adjustment	(6.5)	1.9
Net pension cost	2.9	3.3
Other Postretirement Benefits Plan [Member]
Service cost – benefits earned during the period	1.2	1.9
Interest cost on projected benefit obligation	2.1	1.5
Expected return on plan assets	(3.9)	(4.2)
Amortization of prior service credit	0.1	0.3
Amortization of actuarial loss	(1)	(0.6)
Subtotal	(1.5)	(1.1)
Regulatory adjustment	0.1	3.2
Net pension cost	(1.4)	2.1
Other Postretirement Benefits Plan [Member] | Spire Missouri [Member]
Service cost – benefits earned during the period	1	1.6
Interest cost on projected benefit obligation	1.6	1.1
Expected return on plan assets	(2.6)	(2.8)
Amortization of prior service credit	0.2	0.2
Amortization of actuarial loss	(0.8)	(0.5)
Subtotal	(0.6)	(0.4)
Regulatory adjustment	0.6	3.6
Net pension cost	0	3.2
Other Postretirement Benefits Plan [Member] | Spire Alabama Inc [Member]
Service cost – benefits earned during the period	0.2	0.3
Interest cost on projected benefit obligation	0.4	0.4
Expected return on plan assets	(1.2)	(1.3)
Amortization of prior service credit	(0.1)	0.1
Amortization of actuarial loss	(0.1)	0
Subtotal	(0.8)	(0.5)
Regulatory adjustment	(0.5)	(0.5)
Net pension cost	$ (1.3)	$ (1)

Note 9 - Information by Opera_3

Note 9 - Information by Operating Segment (Details Textual)	3 Months Ended
	Dec. 31, 2022
Number of Reportable Segments	3

Note 9 - Information by Opera_4

Note 9 - Information by Operating Segment - Segment Information by Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Revenues from external customers	$ 814		$ 555.4
Intersegment revenues	0		0
Operating Revenues	814	$ 814	555.4	$ 555.4
Natural gas	419.2	419.2	249.2	249.2
Operation and maintenance	132.1	132.1	116.4	116.4
Depreciation and amortization	62.1	62.1	56.9	56.9
Taxes, other than income taxes	50.4	50.4	37.6	37.6
Total Operating Expenses	663.8	663.8	460.1	460.1
Operating Income (Loss)	150.2	$ 150.2	95.3	$ 95.3
Net Economic Earnings (Loss)	85.1		62.6
Other Segments [Member]
Revenues from external customers	0.1		0.2
Intersegment revenues	3.9		3.5
Operating Revenues	4		3.7
Natural gas	0		0
Operation and maintenance	4		4.2
Depreciation and amortization	0.2		0.1
Taxes, other than income taxes	0		0
Total Operating Expenses	4.2		4.3
Operating Income (Loss)	(0.2)		(0.6)
Net Economic Earnings (Loss)	(7.3)		(7.6)
Operating Segments [Member] | Gas Utility [Member]
Revenues from external customers	733		503.5
Intersegment revenues	0		0
Operating Revenues	733		503.5
Natural gas	401.6		210.2
Operation and maintenance	119.9		107.3
Depreciation and amortization	59.7		54.6
Taxes, other than income taxes	49.9		37
Total Operating Expenses	631.1		409.1
Operating Income (Loss)	101.9		94.4
Net Economic Earnings (Loss)	62.9		67.2
Operating Segments [Member] | Gas Marketing [Member]
Revenues from external customers	74.1		47.9
Intersegment revenues	0		0
Operating Revenues	74.1		47.9
Natural gas	26		48
Operation and maintenance	6.3		2.7
Depreciation and amortization	0.3		0.3
Taxes, other than income taxes	0.1		0
Total Operating Expenses	32.7		51
Operating Income (Loss)	41.4		(3.1)
Net Economic Earnings (Loss)	25.7		0.5
Operating Segments [Member] | Midstream [Member]
Revenues from external customers	6.8		3.8
Intersegment revenues	8.4		9.1
Operating Revenues	15.2		12.9
Natural gas	0		0
Operation and maintenance	5.8		5.8
Depreciation and amortization	1.9		1.9
Taxes, other than income taxes	0.4		0.6
Total Operating Expenses	8.1		8.3
Operating Income (Loss)	7.1		4.6
Net Economic Earnings (Loss)	3.8		2.5
Consolidation, Eliminations [Member]
Revenues from external customers	0		0
Intersegment revenues	(12.3)		(12.6)
Operating Revenues	(12.3)		(12.6)
Natural gas	(8.4)		(9)
Operation and maintenance	(3.9)		(3.6)
Depreciation and amortization	0		0
Taxes, other than income taxes	0		0
Total Operating Expenses	(12.3)		(12.6)
Operating Income (Loss)	0		0
Net Economic Earnings (Loss)	$ 0		$ 0

Note 9 - Information by Opera_5

Note 9 - Information by Operating Segment - Net Economic Earnings to Net Income (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Net Income	$ 91	$ 91	$ 55.7	$ 55.7
Fair value and timing adjustments	(7.8)		3.7
Income tax adjustments	1.9		3.2
Net Economic Earnings	$ 85.1		$ 62.6

Note 9 - Information by Opera_6

Note 9 - Information by Operating Segment - Total Assets by Segment (Details) - USD ($) $ in Millions	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Total Assets	$ 10,327.7	$ 10,083.7	$ 9,650.5
Operating Segments [Member] | Gas Utility [Member]
Total Assets	8,355.1	8,042.8	7,882.1
Operating Segments [Member] | Gas Marketing [Member]
Total Assets	492.4	638.7	424.4
Operating Segments [Member] | Midstream [Member]
Total Assets	466.6	446	421.7
Operating Segments [Member] | Other Segments [Member]
Total Assets	2,882.8	2,449.2	1,995.9
Consolidation, Eliminations [Member]
Total Assets	$ (1,869.2)	$ (1,493)	$ (1,073.6)

Note 10 - Commitments and Con_2

Note 10 - Commitments and Contingencies (Details Textual) $ in Millions	3 Months Ended
	Dec. 31, 2022 USD ($)
Long-Term Purchase Commitment, Amount	$ 1,445
Capital Committed to Contribute to Partnership	10
Contributed Capital, Total	1.9
Spire Missouri [Member]
Long-Term Purchase Commitment, Amount	1,027.3
Spire Alabama Inc [Member]
Long-Term Purchase Commitment, Amount	$ 244.6