Spire Alabama 10-Q 2 Aug 23 2023 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	9 Months Ended
	Jun. 30, 2023	Jul. 31, 2023
Document Information [Line Items]
Entity Central Index Key	0001126956
Entity Registrant Name	Spire Inc.
Amendment Flag	false
Current Fiscal Year End Date	--09-30
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2023
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2023
Document Transition Report	false
Entity File Number	1-16681
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	74-2976504
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		52,603,138
Spire Missouri [Member]
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	Q2
Document Fiscal Year Focus	2023
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	Q2
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		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Operating Revenues	$ 418.5	$ 448	$ 2,355.9	$ 1,884.3
Operating Expenses:
Natural gas	169.8	203.3	1,175.5	844.5
Operation and maintenance	125.5	102.3	389.7	331.9
Depreciation and amortization	64.3	60.4	189	176.2
Taxes, other than income taxes	46.9	44.1	179.2	153.3
Total Operating Expenses	406.5	410.1	1,933.4	1,505.9
Operating Income	12	37.9	422.5	378.4
Interest Expense, Net	46.7	29.3	137.5	85.4
Other Income (Expense), Net	6.3	(12.1)	19.3	(8.1)
(Loss) Income Before Income Taxes	(28.4)	(3.5)	304.3	284.9
Income Tax (Benefit) Expense	(6.8)	(2.1)	55.7	57
Net (Loss) Income	(21.6)	(1.4)	248.6	227.9
Provision for preferred dividends	3.7	3.7	11.1	11.1
(Loss) income allocated to participating securities	(0.1)	0	0.4	0.3
Net (Loss) Income Available to Common Shareholders	$ (25.2)	$ (5.1)	$ 237.1	$ 216.5
Weighted Average Number of Common Shares Outstanding:
Basic (in shares)	52.5	52.2	52.5	51.9
Diluted (in shares)	52.5	52.2	52.6	52
Basic (Loss) Earnings Per Common Share (in dollars per share)	$ (0.48)	$ (0.10)	$ 4.52	$ 4.17
Diluted (Loss) Earnings Per Common Share (in dollars per share)	$ (0.48)	$ (0.10)	$ 4.51	$ 4.16
Operating Revenues	$ 418.5	$ 448	$ 2,355.9	$ 1,884.3
Spire Alabama Inc [Member]
Operating Revenues	113.1	115.7	483.8	446.4
Operating Expenses:
Natural gas	42.7	41	173.9	138.6
Operation and maintenance	33.4	29.2	103	96.6
Depreciation and amortization	17.5	16.9	51.5	50.1
Taxes, other than income taxes	9.3	8.6	36	32.1
Total Operating Expenses	102.9	95.7	364.4	317.4
Operating Income	10.2	20	119.4	129
Interest Expense, Net	8.7	5.2	26	15
Other Income (Expense), Net	0.4	(0.7)	1.1	(0.2)
(Loss) Income Before Income Taxes	1.9	14.1	94.5	113.8
Income Tax (Benefit) Expense	0.6	3.6	24	28.7
Net (Loss) Income	1.3	10.5	70.5	85.1
Weighted Average Number of Common Shares Outstanding:
Operating Revenues	$ 113.1	$ 115.7	$ 483.8	$ 446.4

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Jun. 30, 2023		Jun. 30, 2022		Jun. 30, 2023		Jun. 30, 2022
Net Income	$ (21.6)		$ (1.4)		$ 248.6		$ 227.9
Other Comprehensive Income (Loss), Before Tax:
Net hedging gain (loss) arising during the period	7.6		24.3		(2.2)		38.2
Amounts reclassified into regulatory liabilities	0		0		(17.5)		0
Amounts reclassified into net income	(0.8)		(0.2)		(1.6)		(0.9)
Net gain (loss) on cash flow hedging derivative instruments	6.8		24.1		(21.3)		37.3
Net gain on defined benefit pension and other postretirement plans	0		0.2		0.2		0.4
Net unrealized gain (loss) on available for sale securities	0.1		(0.1)		0.1		(0.3)
Other Comprehensive Income (Loss), Before Tax	6.9		24.2		(21)		37.4
Income Tax Expense (Benefit) Related to Items of Other Comprehensive Income (Loss)	1.6		5.7		(5)		8.8
Other Comprehensive Income (Loss), Net of Tax	5.3		18.5		(16)		28.6
Comprehensive (Loss) Income	(16.3)		17.1		232.6		256.5
Operating Revenues	418.5		448		2,355.9		1,884.3
Operating Expenses:
Natural gas	169.8		203.3		1,175.5		844.5
Operation and maintenance	125.5		102.3		389.7		331.9
Depreciation and amortization	64.3		60.4		189		176.2
Taxes, other than income taxes	46.9		44.1		179.2		153.3
Total Operating Expenses	406.5		410.1		1,933.4		1,505.9
Operating Income	12		37.9		422.5		378.4
Interest Expense, Net	46.7		29.3		137.5		85.4
Other Income (Expense), Net	6.3		(12.1)		19.3		(8.1)
(Loss) Income Before Income Taxes	(28.4)		(3.5)		304.3		284.9
Income Tax (Benefit) Expense	(6.8)		(2.1)		55.7		57
Net (Loss) Income	(21.6)		(1.4)		248.6		227.9
Other Comprehensive Income, Net of Tax	5.3		18.5		(16)		28.6
Comprehensive (Loss) Income	(16.3)		17.1		232.6		256.5
Spire Missouri [Member]
Net Income	(13.8)	[1]	(8.4)		145.6	[1]	135.1
Other Comprehensive Income (Loss), Before Tax:
Other Comprehensive Income (Loss), Net of Tax	0		0.2	[1]	0.2	[1]	0.4
Comprehensive (Loss) Income	(13.8)		(8.2)		145.8		135.5
Operating Revenues	253.8		236.7		1,586		1,155.8
Operating Expenses:
Natural gas	105.5		94.7		887.9		538.8
Operation and maintenance	71.1		59.5		225.6		190.1
Depreciation and amortization	40		37.3		117.8		107.4
Taxes, other than income taxes	34.4		32.3		132		111
Total Operating Expenses	251		223.8		1,363.3		947.3
Operating Income	2.8		12.9		222.7		208.5
Interest Expense, Net	24.9		14.7		71.5		43.4
Other Income (Expense), Net	4.7		(9.7)		15.6		(6.2)
(Loss) Income Before Income Taxes	(17.4)		(11.5)		166.8		158.9
Income Tax (Benefit) Expense	(3.6)		(3.1)		21.2		23.8
Net (Loss) Income	(13.8)	[1]	(8.4)		145.6	[1]	135.1
Other Comprehensive Income, Net of Tax	0		0.2	[1]	0.2	[1]	0.4
Comprehensive (Loss) Income	$ (13.8)		$ (8.2)		$ 145.8		$ 135.5
[1]Accumulated other comprehensive income (loss)

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Millions	Jun. 30, 2023		Sep. 30, 2022		Jun. 30, 2022
ASSETS
Utility Plant	$ 8,016.7		$ 7,664.9		$ 7,549.7
Less: Accumulated depreciation and amortization	2,382.9		2,294.5		2,256.7
Net Utility Plant	5,633.8		5,370.4		5,293
Non-utility Property (net of accumulated depreciation and amortization of $65.7, $50.7 and $46.0 at June 30, 2023, September 30, 2022, and June 30, 2022, respectively)	582.7		491.4		476.9
Other Investments	102.5		87.8		90.5
Total Other Property and Investments	685.2		579.2		567.4
Other Property and Investments	685.2		579.2		567.4
Current Assets:
Cash and cash equivalents	5.3		6.5		16
Utility	245.9		210.8		266.1
Other	127.4		443.8		353.7
Allowance for credit losses	(34.7)		(31.9)		(32.6)
Delayed customer billings	58.6		21.3		45.4
Accounts receivable:
Utility	245.9		210.8		266.1
Other	127.4		443.8		353.7
Allowance for credit losses	(34.7)		(31.9)		(32.6)
Delayed customer billings	58.6		21.3		45.4
Inventories:
Natural gas	184.9		371.8		250.8
Propane gas	8.6		8.6		8.6
Materials and supplies	49.6		41.9		40.9
Regulatory assets	93.3		355.4		152
Prepayments	55.1		41.1		55
Other current assets	67.2		122.7		105.2
Total Current Assets	861.2		1,592		1,261.1
Deferred Charges and Other Assets:
Goodwill	1,171.6		1,171.6		1,171.6
Regulatory assets	1,421.2		1,112.4		1,205.6
Other	264.5		258.1		285.2
Total Deferred Charges and Other Assets	2,857.3		2,542.1		2,662.4
Total Assets	10,037.5		10,083.7		9,783.9
Capitalization:
Preferred stock ($25.00 par value per share; 10.0 million depositary shares authorized, issued and outstanding at June 30, 2023, September 30, 2022, and June 30, 2022)	242		242		242
Common stock (par value $1.00 per share; 70.0 million shares authorized; 52.6 million, 52.5 million, and 52.5 million shares issued and outstanding at June 30, 2023, September 30, 2022, and June 30, 2022, respectively)	52.6		52.5		52.5
Paid-in capital	1,578.3		1,571.3		1,570
Retained earnings	1,028.4		905.5		949.2
Accumulated other comprehensive income	31.2		47.2		32.2
Total Shareholders' Equity	2,932.5		2,818.5		2,845.9
Temporary equity	17.7		13.1		15
Long-term debt (less current portion)	3,553.3		2,958.5		3,207.9
Total Capitalization	6,503.5		5,790.1		6,068.8
Current Liabilities:
Current portion of long-term debt	406.6		281.2		31.2
Notes payable	557.6		1,037.5		709.2
Accounts payable	196.3		617.4		581.2
Advance customer billings	7.6		18.7		7.6
Wages and compensation accrued	35.9		50.2		50
Customer deposits	27.7		28.2		28.6
Taxes accrued	88.5		90.1		76.8
Regulatory liabilities	5.5		3.7		3.2
Other current liabilities	204.7		226.6		262.1
Total Current Liabilities	1,530.4		2,353.6		1,749.9
Deferred Credits and Other Liabilities:
Deferred income taxes	735.9		675.1		675.8
Pension and postretirement benefit costs	154.7		163		199.6
Asset retirement obligations	538.1		520.9		535.4
Regulatory liabilities	428.1		418.2		389
Other noncurrent liabilities	146.8		162.8		165.4
Total Deferred Credits and Other Liabilities	2,003.6		1,940		1,965.2
Commitments and Contingencies (Note 11)
Total Capitalization and Liabilities	10,037.5		10,083.7		9,783.9
Spire Missouri [Member]
ASSETS
Utility Plant	4,831.2		4,550.4		4,498.7
Less: Accumulated depreciation and amortization	1,037.6		982.1		965.7
Net Utility Plant	3,793.6		3,568.3		3,533
Total Other Property and Investments	67.7		58.9		61.3
Other Property and Investments	67.7		58.9		61.3
Current Assets:
Cash and cash equivalents	0		0		7
Utility	186.8		131.5		162.2
Other	23		44.5		12.2
Allowance for credit losses	(28.7)		(24.9)		(25.1)
Delayed customer billings	57		16.1		43.7
Accounts receivable:
Utility	186.8		131.5		162.2
Other	23		44.5		12.2
Allowance for credit losses	(28.7)		(24.9)		(25.1)
Delayed customer billings	57		16.1		43.7
Inventories:
Natural gas	98.5		215.3		140.4
Propane gas	8.6		8.6		8.6
Materials and supplies	25.1		22		22.1
Regulatory assets	35		288.1		89.9
Prepayments	34.5		23.3		31.6
Total Current Assets	446.9		728.2		494.3
Deferred Charges and Other Assets:
Goodwill	210.2		210.2		210.2
Regulatory assets	819.1		547.6		664.6
Other	108.4		105		127.2
Total Deferred Charges and Other Assets	1,137.7		862.8		1,002
Total Assets	5,445.9		5,218.2		5,090.6
Capitalization:
Retained earnings	1,034		931.9		952.1
Accumulated other comprehensive income	(2.5)		(2.7)		(3.8)
Total Shareholders' Equity	1,847.7	[1]	1,745.4	[1]	1,764.5
Long-term debt (less current portion)	1,785.1		1,387.7		1,637.4
Total Capitalization	3,632.8		3,133.1		3,401.9
Paid-in capital and common stock (par value $1.00 per share; 50.0 million shares authorized; 25,325 shares issued and outstanding)	816.2		816.2		816.2
Current Liabilities:
Current portion of long-term debt	250		250		0
Advance customer billings	0		7		0
Wages and compensation accrued	18.3		33.8		33.7
Customer deposits	5.8		6.5		7.1
Taxes accrued	49.3		50.4		41
Other current liabilities	43.6		45.6		45.1
Total Current Liabilities	671.7		970.9		538.3
Deferred Credits and Other Liabilities:
Deferred income taxes	533.7		500.1		501.6
Pension and postretirement benefit costs	96.4		115.5		142
Asset retirement obligations	113.9		110.6		147.8
Regulatory liabilities	346.1		331.8		300.8
Other noncurrent liabilities	51.3		56.2		58.2
Total Deferred Credits and Other Liabilities	1,141.4		1,114.2		1,150.4
Commitments and Contingencies (Note 11)
Total Capitalization and Liabilities	5,445.9		5,218.2		5,090.6
Spire Missouri [Member] | Related Party [Member]
Current Assets:
Utility	7.1		3.7		1.7
Accounts receivable:
Utility	7.1		3.7		1.7
Current Liabilities:
Notes payable	228.1		445.3		285.4
Accounts payable	13.3		13.3		15.5
Spire Missouri [Member] | Nonrelated Party [Member]
Current Liabilities:
Accounts payable	63.3		119		110.5
Spire Alabama Inc [Member]
ASSETS
Utility Plant	2,803.8		2,732.6		2,663
Less: Accumulated depreciation and amortization	1,224.5		1,184.1		1,153.8
Net Utility Plant	1,579.3		1,548.5		1,509.2
Current Assets:
Cash and cash equivalents	0.5		2.4		3.7
Utility	50.1		69.9		92.9
Other	6.4		6.5		5.8
Allowance for credit losses	(5.3)		(6.3)		(6.6)
Delayed customer billings	1.4		4.8		1.6
Accounts receivable:
Utility	50.1		69.9		92.9
Other	6.4		6.5		5.8
Allowance for credit losses	(5.3)		(6.3)		(6.6)
Delayed customer billings	1.4		4.8		1.6
Inventories:
Natural gas	51.9		72.5		69.1
Materials and supplies	20.6		16.3		15.3
Regulatory assets	43.9		56.9		52.9
Prepayments	8.8		5.8		8.3
Total Current Assets	181.9		230.1		243.8
Deferred Charges and Other Assets:
Regulatory assets	576.7		538.2		514.1
Other	82		81.3		81
Total Deferred Charges and Other Assets	658.7		630.5		600.6
Total Assets	2,419.9		2,409.1		2,353.6
Deferred income taxes	0		11		5.5
Capitalization:
Retained earnings	646.6		589.1		613.7
Total Shareholders' Equity	933.5		906		930.6
Long-term debt (less current portion)	745.8		571.5		571.4
Total Capitalization	1,679.3		1,477.5		1,502
Paid-in capital and common stock (par value $1.00 per share; 50.0 million shares authorized; 25,325 shares issued and outstanding)	286.9		316.9		316.9
Current Liabilities:
Accounts payable	28.2		85.6		85.7
Advance customer billings	5.9		9.9		6.1
Wages and compensation accrued	4.9		7.6		7.6
Customer deposits	19.3		19		18.9
Taxes accrued	31.6		31.3		29.3
Other current liabilities	12.2		22.4		21.3
Total Current Liabilities	217.4		441.1		373.3
Deferred Credits and Other Liabilities:
Deferred income taxes	12.8		0		0
Pension and postretirement benefit costs	52.3		40.5		50.9
Asset retirement obligations	411		398.7		373.7
Regulatory liabilities	20.8		23		24
Other noncurrent liabilities	26.3		28.3		29.7
Total Deferred Credits and Other Liabilities	523.2		490.5		478.3
Commitments and Contingencies (Note 11)
Total Capitalization and Liabilities	2,419.9		2,409.1		2,353.6
Spire Alabama Inc [Member] | Related Party [Member]
Current Assets:
Utility	3.6		1.3		0.8
Accounts receivable:
Utility	3.6		1.3		0.8
Current Liabilities:
Notes payable	108.1		260.9		196.3
Accounts payable	$ 7.2		$ 4.4		$ 8.1
[1]Accumulated other comprehensive income (loss)

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Millions	Jun. 30, 2023	Sep. 30, 2022	Jun. 30, 2022
Non-utility property, accumulated depreciation and amortization	$ 65.7	$ 50.7	$ 46
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)	52,600,000	52,500,000	52,500,000
Common Stock, shares outstanding (in shares)	52,600,000	52,500,000	52,500,000
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	25,325
Common Stock, shares outstanding (in shares)	25,325	25,325	25,325
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 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]	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]		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	1,972,052				24,577						51,684,883
Balance at Sep. 30, 2021	$ 0	$ 328.9	$ 552.6	$ 881.5	$ 0.1	$ 765	$ 817	$ (4.2)	$ 1,577.9		$ 51.7	$ 242	$ 1,517.9	$ 843	$ 3.6		$ 2,658.2
Net Income	0	0	85.1	85.1	0	0	135.1	0	135.1		$ 0	0	0	227.9	0	[1]	227.9
Dividend reinvestment plan (in shares)											18,514
Dividend reinvestment plan											$ 0	0	1.2	0	0		1.2
Stock-based compensation costs											$ 0	0	2.7	0	0		2.7
Stock activity under stock-based compensation plans (in shares)											91,293
Stock activity under stock-based compensation plans											$ 0.1	0	(0.1)	0	0		0
Employees’ tax withholding for stock-based compensation (in shares)											(27,533)
Employees’ tax withholding for stock-based compensation											$ 0	0	(1.7)	0	0		(1.7)
Temporary equity adjustment to redemption value											0	0	0	(3.4)	0		(3.4)
Common stock, dividends	0	0	(24)	(24)							0	0	0	(107.2)	0		(107.2)
Preferred stock dividends											0	0	0	(11.1)	0		(11.1)
Other Comprehensive Income, Net of Tax					$ 0	0	0	0.4	0.4		$ 0	0	0	0	28.6		28.6
Common stock issued (in shares)					748						719,625
Stock issued					$ 0	51.1	0	0	51.1		$ 0.7	0	50	0	0		50.7
Return of capital to Spire	$ 0	(12)	0	(12)
Balance (in shares) at Jun. 30, 2022	1,972,052				25,325						52,486,782
Balance at Jun. 30, 2022	$ 0	316.9	613.7	930.6	$ 0.1	816.1	952.1	(3.8)	1,764.5		$ 52.5	242	1,570	949.2	32.2	[1]	2,845.9
Balance (in shares) at Mar. 31, 2022	1,972,052				24,929						52,116,667
Balance at Mar. 31, 2022	$ 0	322.9	611.2	934.1	$ 0.1	788.3	960.5	(4)	1,744.9		$ 52.1	242	1,541.1	992.3	13.7	[1]	2,841.2
Net Income	0	0	10.5	10.5	0	0	(8.4)	0	(8.4)		$ 0	0	0	(1.4)	0		(1.4)
Dividend reinvestment plan (in shares)											5,245
Dividend reinvestment plan											$ 0	0	0.4	0	0	[1]	0.4
Stock-based compensation costs											$ 0	0	1.3	0	0	[1]	1.3
Stock activity under stock-based compensation plans (in shares)											(135)
Stock activity under stock-based compensation plans											$ 0	0	0	0	0		0
Employees’ tax withholding for stock-based compensation (in shares)											(620)
Employees’ tax withholding for stock-based compensation											$ 0	0	0	0	0	[1]	0
Temporary equity adjustment to redemption value											0	0	0	(2.2)	0	[1]	(2.2)
Common stock, dividends	0	0	(8)	(8)							0	0	0	(35.8)	0	[1]	(35.8)
Preferred stock dividends											0	0	0	(3.7)	0	[1]	(3.7)
Other Comprehensive Income, Net of Tax					$ 0	0	0	0.2	0.2	[1]	$ 0	0	0	0	18.5		18.5
Common stock issued (in shares)					396						365,625
Stock issued					$ 0	27.8	0	0	27.8		$ 0.4	0	27.2	0	0		27.6
Return of capital to Spire	$ 0	(6)	0	(6)
Balance (in shares) at Jun. 30, 2022	1,972,052				25,325						52,486,782
Balance at Jun. 30, 2022	$ 0	316.9	613.7	930.6	$ 0.1	816.1	952.1	(3.8)	1,764.5		$ 52.5	242	1,570	949.2	32.2	[1]	2,845.9
Balance (in shares) at Sep. 30, 2022	1,972,052				25,325						52,494,543
Balance at Sep. 30, 2022	$ 0	316.9	589.1	906	$ 0.1	816.1	931.9	(2.7)	1,745.4	[1]	$ 52.5	242	1,571.3	905.5	47.2		2,818.5
Net Income	0	0	70.5	70.5	0	0	145.6	0	145.6	[1]	$ 0		0	248.6	0	[1]	248.6
Dividend reinvestment plan (in shares)											16,488
Dividend reinvestment plan											$ 0	0	1.1	0	0		1.1
Stock-based compensation costs											$ 0	0	4.3	0	0		4.3
Stock activity under stock-based compensation plans (in shares)											64,077
Stock activity under stock-based compensation plans											$ 0	0	0	0	0		0
Employees’ tax withholding for stock-based compensation (in shares)											(17,679)
Employees’ tax withholding for stock-based compensation											$ 0	0	(1.3)	0	0		(1.3)
Temporary equity adjustment to redemption value											0	0	0	(0.2)	0		(0.2)
Common stock, dividends	0	0	(13)	(13)	0	0	(43.5)	0	(43.5)		0	0	0	(114.4)	0		(114.4)
Preferred stock dividends											0	0	0	(11.1)	0		(11.1)
Other Comprehensive Income, Net of Tax					$ 0	0	0	0.2	0.2	[1]	$ 0		0	0	(16)		(16)
Common stock issued (in shares)											40,500
Stock issued											$ 0.1	0	2.9	0	0		3
Return of capital to Spire	$ 0	(30)	0	(30)
Balance (in shares) at Jun. 30, 2023	1,972,052				25,325						52,597,929
Balance at Jun. 30, 2023	$ 0	286.9	646.6	933.5	$ 0.1	816.1	1,034	(2.5)	1,847.7	[1]	$ 52.6	242	1,578.3	1,028.4	31.2	[1]	2,932.5
Balance (in shares) at Mar. 31, 2023	1,972,052				25,325						52,593,433
Balance at Mar. 31, 2023	$ 0	289.9	645.3	935.2	$ 0.1	816.1	1,061.3	(2.5)	1,875	[1]	$ 52.6	242	1,576.5	1,089.5	25.9	[1]	2,986.5
Net Income	0	0	1.3	1.3	0	0	(13.8)	0	(13.8)	[1]	$ 0	0	0	(21.6)	0		(21.6)
Dividend reinvestment plan (in shares)											5,367
Dividend reinvestment plan											$ 0	0	0.4	0	0	[1]	0.4
Stock-based compensation costs											$ 0		1.4	0	0	[1]	1.4
Stock activity under stock-based compensation plans (in shares)											(609)
Stock activity under stock-based compensation plans											$ 0	0	0	0	0		0
Employees’ tax withholding for stock-based compensation (in shares)											(262)
Employees’ tax withholding for stock-based compensation											$ 0	0	0	0	0	[1]	0
Temporary equity adjustment to redemption value											0		0	2.8	0	[1]	2.8
Common stock, dividends					$ 0	0	(13.5)	0	(13.5)		0		0	(38.6)	0	[1]	(38.6)
Preferred stock dividends											0		0	(3.7)	0	[1]	(3.7)
Other Comprehensive Income, Net of Tax									0		$ 0	0	0	0	5.3		5.3
Return of capital to Spire	$ 0	(3)	0	(3)
Balance (in shares) at Jun. 30, 2023	1,972,052				25,325						52,597,929
Balance at Jun. 30, 2023	$ 0	$ 286.9	$ 646.6	$ 933.5	$ 0.1	$ 816.1	$ 1,034	$ (2.5)	$ 1,847.7	[1]	$ 52.6	$ 242	$ 1,578.3	$ 1,028.4	$ 31.2	[1]	$ 2,932.5
[1]Accumulated other comprehensive income (loss)

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Shareholders' Equity (Unaudited) (Parentheticals) - $ / shares	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Common stock, dividends per share declared (in dollars per share)	$ 0.72	$ 0.685	$ 2.16	$ 2.055
Preferred stock dividends per share declared (in dollars per share)	$ 0.36875	$ 0.36875	$ 1.10625	$ 1.10625

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2023		Jun. 30, 2022
Operating Activities:
Net Income	$ 248.6		$ 227.9
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	189		176.2
Deferred income taxes and investment tax credits	55.7		57
Changes in assets and liabilities:
Accounts receivable	284.1		9.1
Inventories	179.3		4.9
Regulatory assets and liabilities	(18)		(323.8)
Accounts payable	(405.6)		180.3
Delayed/advance customer billings, net	(48.5)		(60.8)
Taxes accrued	(2.3)		(2.2)
Other assets and liabilities	(88.4)		(70.1)
Other	10.2		6.1
Net cash provided by operating activities	404.1		204.6
Investing Activities:
Capital expenditures	(483.3)		(402.5)
Business acquisition	(37)		0
Other	3.9		4.2
Net cash used in investing activities	(516.4)		(398.3)
Financing Activities:
Issuance of long-term debt	755		300
Repayment of long-term debt	(31.2)		(55.8)
(Repayment) issuance of short-term debt, net	(479.9)		37.2
Issuance of common stock	4		51.9
Dividends paid on common stock	(112.5)		(105.9)
Dividends paid on preferred stock	(11.1)		(11.1)
Other financing activities	(7.5)		(3.8)
Net cash provided by financing activities	116.8		212.5
Net Increase in Cash, Cash Equivalents, and Restricted Cash	4.5		18.8
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	20.5		11.3
Cash, Cash Equivalents, and Restricted Cash at End of Period	25		30.1
Supplemental disclosure of cash paid for:
Interest, net of amounts capitalized	(118.2)		(80.2)
Income taxes	(1.8)		(0.7)
Spire Missouri [Member]
Operating Activities:
Net Income	145.6	[1]	135.1
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	117.8		107.4
Deferred income taxes and investment tax credits	21.2		23.8
Changes in assets and liabilities:
Accounts receivable	(33.3)		167.6
Inventories	113.7		29.4
Regulatory assets and liabilities	1.2		(260.8)
Accounts payable	(43.6)		25.8
Delayed/advance customer billings, net	(47.9)		(61)
Taxes accrued	(1.1)		(0.2)
Other assets and liabilities	(88.4)		(48.5)
Other	1.3		1
Net cash provided by operating activities	186.5		119.6
Investing Activities:
Capital expenditures	(324.8)		(258.7)
Other	2.9		2.6
Net cash used in investing activities	(321.9)		(256.1)
Financing Activities:
Issuance of long-term debt	400		300
Issuance of common stock	0		51.1
Dividends paid on common stock	(43.5)		0
Other financing activities	(3.9)		(2.1)
Net cash provided by financing activities	135.4		143.5
Net Increase in Cash, Cash Equivalents, and Restricted Cash	0		7
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	0		0
Cash, Cash Equivalents, and Restricted Cash at End of Period	0		7
Repayment of short-term debt, net	0		(250)
(Repayments to) Borrowings from Spire, net	(217.2)		44.5
Supplemental disclosure of cash paid for:
Interest, net of amounts capitalized	(64.7)		(43.9)
Income taxes	0		0
Spire Alabama Inc [Member]
Operating Activities:
Net Income	70.5		85.1
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	51.5		50.1
Deferred income taxes and investment tax credits	24		28.7
Changes in assets and liabilities:
Accounts receivable	16.6		(42.7)
Inventories	16.4		(38.1)
Regulatory assets and liabilities	(16.8)		(67.4)
Accounts payable	(39.9)		41.6
Delayed/advance customer billings, net	(0.6)		(0.1)
Taxes accrued	0.3		(1.2)
Other assets and liabilities	3.3		(17.4)
Other	0.3		0
Net cash provided by operating activities	125.6		38.6
Investing Activities:
Capital expenditures	(98.4)		(105)
Other	0.7		0.7
Net cash used in investing activities	(97.7)		(104.3)
Financing Activities:
Issuance of long-term debt	175		0
Repayment of long-term debt	0		(50)
Dividends paid on common stock	(21)		(16)
Other financing activities	(1)		0
Net cash provided by financing activities	(29.8)		69.4
Net Increase in Cash, Cash Equivalents, and Restricted Cash	(1.9)		3.7
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	2.4		0
Cash, Cash Equivalents, and Restricted Cash at End of Period	0.5		3.7
(Repayments to) Borrowings from Spire, net	(152.8)		147.4
Return of capital to Spire	(30)		(12)
Supplemental disclosure of cash paid for:
Interest, net of amounts capitalized	(23.3)		(14.7)
Income taxes	$ 0		$ 0
[1]Accumulated other comprehensive income (loss)

Note 1 - Summary of Significant

Note 1 - Summary of Significant Accounting Policies	9 Months Ended
	Jun. 30, 2023
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 10 The Company’s earnings are derived primarily 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 5 DERIVATIVES 815, Derivatives and Hedging not TRANSACTIONS WITH AFFILIATES Three Months Ended June 30, Nine Months Ended June 30, 2023 2022 2023 2022 Spire Missouri Purchases of natural gas from Spire Marketing $ 6.5 $ 26.2 $ 48.8 $ 62.3 Transportation services received from Spire STL Pipeline 8.0 8.0 23.9 23.9 Sales of natural gas to Spire Marketing 0.3 — 0.4 — Spire Alabama Purchases of natural gas from Spire Marketing $ 1.7 $ 3.2 $ 2.8 $ 3.2 RESTRICTED CASH AND OTHER INVESTMENTS June 30, 2023 June 30, 2023 September 30, 2022 June 30, 2022, BUSINESS COMBINATIONS April 1, 2023. no ACCRUED CAPITAL EXPENDITURES June 30, September 30, June 30, 2023 2022 2022 Spire $ 62.2 $ 77.8 $ 52.6 Spire Missouri 33.4 45.6 39.2 Spire Alabama 4.5 19.2 7.7 ACCOUNTS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES not Spire Spire Missouri Spire Alabama Three Months Ended June 30, 2023 2022 2023 2022 2023 2022 Allowance at beginning of period $ 40.6 $ 35.1 $ 34.5 $ 27.0 $ 5.3 $ 7.1 Provision for expected credit losses 1.2 1.9 0.3 1.8 0.8 — Write-offs, net of recoveries (7.1 ) (4.4 ) (6.1 ) (3.7 ) (0.8 ) (0.5 ) Allowance at end of period $ 34.7 $ 32.6 $ 28.7 $ 25.1 $ 5.3 $ 6.6 Nine Months Ended June 30, 2023 2022 2023 2022 2023 2022 Allowance at beginning of period $ 31.9 $ 30.3 $ 24.9 $ 22.6 $ 6.3 $ 6.6 Provision for expected credit losses 13.5 8.6 11.4 8.6 1.5 — Write-offs, net of recoveries (10.7 ) (6.3 ) (7.6 ) (6.1 ) (2.5 ) — Allowance at end of period $ 34.7 $ 32.6 $ 28.7 $ 25.1 $ 5.3 $ 6.6

Note 2 - Revenue

Note 2 - Revenue	9 Months Ended
	Jun. 30, 2023
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 June 30, Nine Months Ended June 30, 2023 2022 2023 2022 Spire Gas Utility: Residential $ 238.1 $ 239.5 $ 1,486.3 $ 1,268.8 Commercial and industrial 102.2 86.2 533.1 275.6 Transportation 29.0 26.9 93.2 91.6 Off-system and other incentive 8.2 10.1 21.9 26.9 Other customer revenue 5.1 5.6 13.8 15.7 Total revenue from contracts with customers 382.6 368.3 2,148.3 1,678.6 Changes in accrued revenue under alternative revenue programs 5.2 9.1 27.0 19.7 Total Gas Utility operating revenues 387.8 377.4 2,175.3 1,698.3 Gas Marketing 23.1 64.1 157.8 171.4 Midstream 17.4 14.6 49.1 41.3 Other 4.3 4.1 12.4 12.1 Total before eliminations 432.6 460.2 2,394.6 1,923.1 Intersegment eliminations (see Note 10, Information by Operating Segment) (14.1 ) (12.2 ) (38.7 ) (38.8 ) Total Operating Revenues $ 418.5 $ 448.0 $ 2,355.9 $ 1,884.3 Spire Missouri Residential $ 171.7 $ 171.1 $ 1,142.3 $ 947.3 Commercial and industrial 61.1 51.9 369.2 140.0 Transportation 7.1 7.1 26.1 26.4 Off-system and other incentive 6.0 4.5 15.6 20.3 Other customer revenue 3.8 3.2 10.1 9.1 Total revenue from contracts with customers 249.7 237.8 1,563.3 1,143.1 Changes in accrued revenue under alternative revenue programs 4.1 (1.1 ) 22.7 12.7 Total Operating Revenues $ 253.8 $ 236.7 $ 1,586.0 $ 1,155.8 Spire Alabama Residential $ 56.7 $ 56.2 $ 288.1 $ 266.2 Commercial and industrial 32.7 24.0 127.8 101.6 Transportation 18.9 17.4 59.0 57.5 Off-system and other incentive 2.2 5.6 6.3 6.6 Other customer revenue 0.8 1.5 2.7 4.2 Total revenue from contracts with customers 111.3 104.7 483.9 436.1 Changes in accrued revenue under alternative revenue programs 1.8 11.0 (0.1 ) 10.3 Total Operating Revenues $ 113.1 $ 115.7 $ 483.8 $ 446.4 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 June 30, Nine Months Ended June 30, 2023 2022 2023 2022 Spire $ 26.0 $ 23.3 $ 116.6 $ 97.1 Spire Missouri 18.9 16.7 86.6 70.6 Spire Alabama 6.1 5.5 25.5 22.5

Note 3 - Earnings Per Common Sh

Note 3 - Earnings Per Common Share	9 Months Ended
	Jun. 30, 2023
Notes to Financial Statements
Earnings Per Share [Text Block]	3. Three Months Ended June 30, Nine Months Ended June 30, 2023 2022 2023 2022 Basic Earnings Per Common Share: Net (Loss) Income $ (21.6 ) $ (1.4 ) $ 248.6 $ 227.9 Less: Provision for preferred dividends 3.7 3.7 11.1 11.1 (Loss) income allocated to participating securities (0.1 ) — 0.4 0.3 (Loss) Income Available to Common Shareholders $ (25.2 ) $ (5.1 ) $ 237.1 $ 216.5 Weighted Average Common Shares Outstanding (in millions) 52.5 52.2 52.5 51.9 Basic (Loss) Earnings Per Common Share $ (0.48 ) $ (0.10 ) $ 4.52 $ 4.17 Diluted Earnings Per Common Share: Net (Loss) Income $ (21.6 ) $ (1.4 ) $ 248.6 $ 227.9 Less: Provision for preferred dividends 3.7 3.7 11.1 11.1 (Loss) income allocated to participating securities (0.1 ) — 0.4 0.3 (Loss) Income Available to Common Shareholders $ (25.2 ) $ (5.1 ) $ 237.1 $ 216.5 Weighted Average Common Shares Outstanding (in millions) 52.5 52.2 52.5 51.9 Dilutive Effect of forward sales of common stock, restricted stock and restricted stock units (in millions)* — — 0.1 0.1 Weighted Average Diluted Common Shares (in millions) 52.5 52.2 52.6 52.0 Diluted (Loss) Earnings Per Common Share $ (0.48 ) $ (0.10 ) $ 4.51 $ 4.16 * Calculation excludes certain outstanding or potential common shares (shown in millions by period at the right) attributable to (1) forward sales of common stock, (2) stock units subject to performance or market conditions, and (3) restricted stock, which could have a dilutive effect in the future 2.7 0.2 2.5 0.2

Note 4 - Shareholders' Equity

Note 4 - Shareholders' Equity	9 Months Ended
	Jun. 30, 2023
Notes to Financial Statements
Equity [Text Block]	4. EQUITY ATM Program On February 6, 2019, May 14, 2019, may may April 28, 2022, May 2025. Settled sales under this ATM program are included in “Common stock issued” in the Condensed Consolidated Statements of Shareholders’ Equity. Also, in the second third 2023, third December 28, 2023. September 2023. July 31, 2023, no June 30, 2023, As of June 30, 2023, may

Note 5 - Regulatory Matters

Note 5 - Regulatory Matters	9 Months Ended
	Jun. 30, 2023
Notes to Financial Statements
Public Utilities Disclosure [Text Block]	5. As explained in Note 1 980, Regulated Operations June 30, 2023 September 30, 2022 June 30, 2022 June 30, September 30, June 30, Spire 2023 2022 2022 Regulatory Assets: Current: Unamortized purchased gas adjustments $ 66.2 $ 322.2 $ 123.4 Other 27.1 33.2 28.6 Total Current Regulatory Assets 93.3 355.4 152.0 Noncurrent: Pension and postretirement benefit costs 268.8 294.5 317.5 Cost of removal 597.9 493.7 471.9 Future income taxes due from customers 140.1 137.8 140.4 Energy efficiency 55.8 57.2 54.1 Unamortized purchased gas adjustments 206.3 — 97.4 Other 152.3 129.2 124.3 Total Noncurrent Regulatory Assets 1,421.2 1,112.4 1,205.6 Total Regulatory Assets $ 1,514.5 $ 1,467.8 $ 1,357.6 Regulatory Liabilities: Current: Other $ 5.5 $ 3.7 $ 3.2 Total Current Regulatory Liabilities 5.5 3.7 3.2 Noncurrent: Deferred taxes due to customers 131.8 145.3 148.7 Pension and postretirement benefit costs 165.3 172.6 185.0 Accrued cost of removal 107.7 32.9 40.7 Unamortized purchased gas adjustments — 53.0 — Other 23.3 14.4 14.6 Total Noncurrent Regulatory Liabilities 428.1 418.2 389.0 Total Regulatory Liabilities $ 433.6 $ 421.9 $ 392.2 June 30, September 30, June 30, Spire Missouri 2023 2022 2022 Regulatory Assets: Current: Unamortized purchased gas adjustments $ 32.9 $ 275.1 $ 89.7 Other 2.1 13.0 0.2 Total Current Regulatory Assets 35.0 288.1 89.9 Noncurrent: Future income taxes due from customers 131.8 129.2 131.8 Pension and postretirement benefit costs 193.4 222.9 238.5 Energy efficiency 55.8 57.2 54.1 Unamortized purchased gas adjustments 206.3 — 97.4 Cost of removal 95.3 25.2 34.9 Other 136.5 113.1 107.9 Total Noncurrent Regulatory Assets 819.1 547.6 664.6 Total Regulatory Assets $ 854.1 $ 835.7 $ 754.5 Regulatory Liabilities: Noncurrent: Deferred taxes due to customers $ 118.1 $ 127.9 $ 131.3 Pension and postretirement benefit costs 137.9 143.6 154.5 Accrued cost of removal 72.3 — 7.3 Unamortized purchased gas adjustments — 53.0 — Other 17.8 7.3 7.7 Total Noncurrent Regulatory Liabilities 346.1 331.8 300.8 Total Regulatory Liabilities $ 346.1 $ 331.8 $ 300.8 June 30, September 30, June 30, Spire Alabama 2023 2022 2022 Regulatory Assets: Current: Unamortized purchased gas adjustments $ 30.9 $ 43.8 $ 31.6 Other 13.0 13.1 21.3 Total Current Regulatory Assets 43.9 56.9 52.9 Noncurrent: Future income taxes due from customers 2.0 2.2 2.2 Pension and postretirement benefit costs 71.1 66.5 73.8 Cost of removal 502.6 468.5 437.0 Other 1.0 1.0 1.1 Total Noncurrent Regulatory Assets 576.7 538.2 514.1 Total Regulatory Assets $ 620.6 $ 595.1 $ 567.0 Regulatory Liabilities: Noncurrent: Pension and postretirement benefit costs $ 17.3 $ 19.4 $ 20.4 Other 3.5 3.6 3.6 Total Noncurrent Regulatory Liabilities 20.8 23.0 24.0 Total Regulatory Liabilities $ 20.8 $ 23.0 $ 24.0 A portion of the Company’s and Spire Missouri’s regulatory assets are not June 30, September 30, June 30, 2023 2022 2022 Spire Pension and postretirement benefit costs $ 127.5 $ 152.9 $ 165.8 Future income taxes due from customers 138.0 135.6 138.2 Unamortized purchased gas adjustments 239.2 275.1 187.2 Other 102.2 122.7 130.9 Total Regulatory Assets Not Earning a Return $ 606.9 $ 686.3 $ 622.1 Spire Missouri Pension and postretirement benefit costs $ 127.5 $ 152.9 $ 165.8 Future income taxes due from customers 131.8 129.2 131.8 Unamortized purchased gas adjustments 239.2 275.1 187.2 Other 102.2 122.7 130.9 Total Regulatory Assets Not Earning a Return $ 600.7 $ 679.9 $ 615.7 Like all the Company’s regulatory assets, these regulatory assets as of June 30, 2023 two not not 35 not not Spire Missouri In mid- February 2021, third three not February 2022, second 2022. three May 2022, In the first 2022, December 23, 2021 December 23, 2021 September 30, 2022 April 1, 2022, November 4, 2022. November 18, 2022, ding $19.0 alre 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. As noted above, all prior ISRS revenues were reset to zero December 26, 2022 April 20, 2023, May 6, 2023, October 2022 February 2023. June 20, 2023, March 2023 May 2023 June 2023 August 2023. December 17, 2023. 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 November January November 29, 2022 January 19, 2023, On May 27, 2022, first no July 11, 2022, July 29 August 1, 2022, January 6, 2023, January 25, 2023, April 28, 2023, No July 25- 26, 2023; July 21, 2023, August The MoPSC has initiated their annual ACA dockets (GR- 2022 0135 2022 0136 2020 2021 December 15, 2022, July 12, 2023, May 2024. 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. April 30, 2023 July 1, 2023. On September 14, 2022, June 30, 2022, December 6, 2022, January 1, 2023. In August 2018, “August 2018 November 2019, August 2018 one January 2020, two June 22, 2021, September 14, 2021 December 3, 2021, December 15, 2022, January 17, 2023, December 15, 2022 February 17, 2023, April 20, 2023, No

Note 6 - Financing

Note 6 - Financing	9 Months Ended
	Jun. 30, 2023
Notes to Financial Statements
Debt Disclosure [Text Block]	6. 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 June 30, 2023 June 30, 2023 Spire utilizes a commercial paper program (“CP Program”) pursuant to which Spire may may not may 365 On January 5, 2023, October 5, 2023. May 8, 2023. Information about short-term borrowings, including Spire Missouri’s and Spire Alabama’s borrowings from Spire, is presented in the following table. As of June 30, 2023 Spire (Parent Only) Spire Missouri Spire Alabama Spire CP Term Spire Spire Consol- Program Loan Note Note idated Nine Months Ended June 30, 2023 Highest borrowings outstanding $ 1,282.0 $ 250.0 $ 656.9 $ 274.0 $ 1,482.0 Lowest borrowings outstanding 354.4 — 3.8 76.7 489.0 Weighted average borrowings 778.7 89.4 308.9 123.3 868.1 Weighted average interest rate 4.7 % 5.5 % 4.6 % 4.8 % 4.8 % As of June 30, 2023 Borrowings outstanding $ 557.6 $ — $ 228.1 $ 108.1 $ 557.6 Weighted average interest rate 5.5 % — % 5.5 % 5.5 % 5.5 % As of September 30, 2022 Borrowings outstanding $ 1,037.5 $ — $ 445.3 $ 260.9 $ 1,037.5 Weighted average interest rate 3.3 % n/a 3.3 % 3.3 % 3.3 % As of June 30, 2022 Borrowings outstanding $ 709.2 $ — $ 285.4 $ 196.3 $ 709.2 Weighted average interest rate 2.0 % n/a 2.0 % 2.0 % 2.0 % Long-term The long-term debt agreements of Spire, Spire Missouri and Spire Alabama contain customary financial covenants and default provisions. As of June 30, 2023 no Interest expense shown on the statements of income is net of the capitalized interest amounts shown in the following table. Three Months Ended June 30, Nine Months Ended June 30, 2023 2022 2023 2022 Spire $ 2.3 $ 1.1 $ 5.8 $ 3.2 Spire Missouri 1.0 0.2 2.1 0.3 Spire Alabama 0.5 0.9 1.8 2.5 On October 13, 2022, October 15, 2029, October 15, 2032, October 13, 2022, first October 15, 2037, first may On February 13, 2023, 2033. The notes are senior secured indebtedness of Spire Missouri and rank equally with all other existing and future senior secured indebtedness issued by Spire Missouri under its mortgage and deed of trust. The bonds are secured by a first On March 7, 2023, 2023 March 15, 2033. In the quarter ended March 31, 2023, 10 two

Note 7 - Fair Value of Financia

Note 7 - Fair Value of Financial Instruments	9 Months Ended
	Jun. 30, 2023
Notes to Financial Statements
Fair Value Disclosures [Text Block]	7. 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 8 The carrying amounts and estimated fair values of financial instruments not no 3 June 30, 2023 September 30, 2022 June 30, 2022 Classification of Estimated Fair Value Carrying Amount Fair Value Quoted Prices in Active Markets (Level 1) Significant Observable Inputs (Level 2) Spire As of June 30, 2023 Cash and cash equivalents $ 5.3 $ 5.3 $ 5.3 $ — Notes payable 557.6 557.6 — 557.6 Long-term debt, including current portion 3,959.9 3,650.7 — 3,650.7 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 June 30, 2022 Cash and cash equivalents $ 16.0 $ 16.0 $ 16.0 $ — Notes payable 709.2 709.2 — 709.2 Long-term debt, including current portion 3,239.1 3,032.1 — 3,032.1 Spire Missouri As of June 30, 2023 Notes payable – associated companies $ 228.1 $ 228.1 $ — $ 228.1 Long-term debt, including current portion 2,035.1 1,890.2 — 1,890.2 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 June 30, 2022 Cash and cash equivalents $ 7.0 $ 7.0 $ 7.0 $ — Notes payable – associated companies 285.4 285.4 — 285.4 Long-term debt 1,637.4 1,562.4 — 1,562.4 Spire Alabama As of June 30, 2023 Cash and cash equivalents $ 0.5 $ 0.5 $ 0.5 $ — Notes payable – associated companies 108.1 108.1 — 108.1 Long-term debt 745.8 681.5 — 681.5 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 June 30, 2022 Cash and cash equivalents $ 3.7 $ 3.7 $ 3.7 $ — Notes payable – associated companies 196.3 196.3 — 196.3 Long-term debt 571.4 527.2 — 527.2

Note 8 - Fair Value Measurement

Note 8 - Fair Value Measurements	9 Months Ended
	Jun. 30, 2023
Notes to Financial Statements
Fair Value Measurement and Measurement Inputs, Recurring and Nonrecurring [Text Block]	8. 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 June 30, 2023 September 30, 2022 June 30, 2022 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 June 30, 2023 ASSETS Gas Utility: U.S. stock/bond mutual funds $ 21.4 $ — $ — $ 21.4 Gas Marketing: NYMEX/ICE natural gas contracts 10.5 — (10.5 ) — Natural gas commodity contracts 35.8 — (1.0 ) 34.8 Other: U.S. stock/bond mutual funds 31.4 — — 31.4 Interest rate swaps — 22.8 — 22.8 Total $ 99.1 $ 22.8 $ (11.5 ) $ 110.4 LIABILITIES Gas Utility: NYMEX/ICE natural gas contracts $ 44.8 $ — $ (44.8 ) $ — Gasoline and heating oil contracts 0.7 — (0.7 ) — Gas Marketing: NYMEX/ICE natural gas contracts 24.3 — (24.3 ) — Natural gas commodity contracts 34.9 — (1.0 ) 33.9 Other: Interest rate swaps — 0.8 — 0.8 Total $ 104.7 $ 0.8 $ (70.8 ) $ 34.7 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 $ 254.6 $ 63.6 $ (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 June 30, 2022 ASSETS Gas Utility: U.S. stock/bond mutual funds $ 20.3 $ — $ — $ 20.3 NYMEX/ICE natural gas contracts 39.6 — (39.6 ) — Gas Marketing: NYMEX/ICE natural gas contracts 94.2 — (94.2 ) — Natural gas commodity contracts 57.6 — (5.3 ) 52.3 Other: U.S. stock/bond mutual funds 31.6 — — 31.6 Interest rate swaps — 52.7 (7.6 ) 45.1 Total $ 243.3 $ 52.7 $ (146.7 ) $ 149.3 LIABILITIES Gas Utility: NYMEX/ICE natural gas contracts $ 12.8 $ — $ (12.8 ) $ — Gas Marketing: NYMEX/ICE natural gas contracts 60.8 — (60.8 ) — Natural gas commodity contracts 118.3 — (5.3 ) 113.0 Other: Interest rate swaps — 7.6 (7.6 ) — Total $ 191.9 $ 7.6 $ (86.5 ) $ 113.0 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 June 30, 2023 ASSETS U.S. stock/bond mutual funds $ 21.4 $ — $ — $ 21.4 LIABILITIES NYMEX/ICE natural gas contracts $ 44.8 $ — $ (44.8 ) $ — Gasoline and heating oil contracts 0.7 — (0.7 ) — Total $ 45.5 $ — $ (45.5 ) $ — 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 June 30, 2022 ASSETS U.S. stock/bond mutual funds $ 20.3 $ — $ — $ 20.3 NYMEX/ICE natural gas contracts 39.6 — (39.6 ) — Total $ 59.9 $ — $ (39.6 ) $ 20.3 LIABILITIES NYMEX/ICE natural gas contracts $ 12.8 $ — $ (12.8 ) $ —

Note 9 - Pension Plans and Othe

Note 9 - Pension Plans and Other Postretirement Benefits	9 Months Ended
	Jun. 30, 2023
Notes to Financial Statements
Retirement Benefits [Text Block]	9. 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 June 30, Nine Months Ended June 30, 2023 2022 2023 2022 Spire Service cost – benefits earned during the period $ 4.2 $ 4.8 $ 12.2 $ 15.6 Interest cost on projected benefit obligation 6.6 5.4 18.9 15.8 Expected return on plan assets (6.4 ) (7.7 ) (18.5 ) (24.1 ) Amortization of prior service credit (1.1 ) (1.1 ) (3.4 ) (3.4 ) Amortization of actuarial loss 1.5 2.5 4.7 9.8 Loss on lump-sum settlements — 17.8 8.6 29.5 Subtotal 4.8 21.7 22.5 43.2 Regulatory adjustment 6.1 (6.9 ) 18.3 2.5 Net pension cost $ 10.9 $ 14.8 $ 40.8 $ 45.7 Spire Missouri Service cost – benefits earned during the period $ 2.8 $ 3.5 $ 8.5 $ 11.2 Interest cost on projected benefit obligation 4.5 3.8 13.4 10.9 Expected return on plan assets (4.5 ) (5.7 ) (13.5 ) (17.6 ) Amortization of prior service credit (0.5 ) (0.5 ) (1.5 ) (1.5 ) Amortization of actuarial loss 1.5 2.0 4.6 7.6 Loss on lump-sum settlements — 17.3 — 24.1 Subtotal 3.8 20.4 11.5 34.7 Regulatory adjustment 3.4 (8.3 ) 19.6 1.3 Net pension cost $ 7.2 $ 12.1 $ 31.1 $ 36.0 Spire Alabama Service cost – benefits earned during the period $ 1.3 $ 1.1 $ 3.2 $ 3.8 Interest cost on projected benefit obligation 1.5 1.1 3.6 3.4 Expected return on plan assets (1.1 ) (1.2 ) (2.7 ) (4.0 ) Amortization of prior service credit (0.6 ) (0.6 ) (1.8 ) (1.8 ) Amortization of actuarial loss 0.1 0.5 0.4 2.2 Loss on lump-sum settlements — 0.5 8.6 5.4 Subtotal 1.2 1.4 11.3 9.0 Regulatory adjustment 2.4 1.1 (2.0 ) 0.5 Net pension cost $ 3.6 $ 2.5 $ 9.3 $ 9.5 Pursuant to the provisions of Spire Missouri’s and Spire Alabama’s pension plans, pension obligations may three nine June 30, 2023 two one September 30, 2022. one nine June 30, 2023 For the three June 30, 2022, one two February 28, 2022, February 28, 2022. one second no June 30, 2022. For the three March 31, 2022, one two September 30, 2021, first second September 30, 2021. 12.3 one 12.6 second March 31, 2022. Effective December 23, 2021, December 26, 2022, Also effective December 23, 2021, eight eight eight eight December 26, 2022, The funding policy of the Utilities is to contribute an amount not 2023 June 30, 2023 $29.7 2023 June 30, 2023 $2.8. No 2023. C 2023 $25.0. 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 June 30, Nine Months Ended June 30, 2023 2022 2023 2022 Spire Service cost – benefits earned during the period $ 1.2 $ 1.9 $ 3.6 $ 5.8 Interest cost on accumulated postretirement benefit obligation 2.0 1.6 6.3 4.6 Expected return on plan assets (4.0 ) (4.3 ) (11.8 ) (12.8 ) Amortization of prior service cost 0.1 0.3 0.2 0.8 Amortization of actuarial gain (0.9 ) (0.5 ) (3.0 ) (1.7 ) Subtotal (1.6 ) (1.0 ) (4.7 ) (3.3 ) Regulatory adjustment (0.5 ) (0.1 ) (0.2 ) 3.2 Net postretirement benefit income $ (2.1 ) $ (1.1 ) $ (4.9 ) $ (0.1 ) Spire Missouri Service cost – benefits earned during the period $ 1.0 $ 1.6 $ 3.0 $ 4.8 Interest cost on accumulated postretirement benefit obligation 1.6 1.2 4.9 3.4 Expected return on plan assets (2.6 ) (2.9 ) (7.9 ) (8.6 ) Amortization of prior service cost 0.1 0.2 0.4 0.6 Amortization of actuarial gain (0.8 ) (0.5 ) (2.4 ) (1.5 ) Subtotal (0.7 ) (0.4 ) (2.0 ) (1.3 ) Regulatory adjustment (0.2 ) 0.4 1.1 4.5 Net postretirement benefit cost $ (0.9 ) $ — $ (0.9 ) $ 3.2 Spire Alabama Service cost – benefits earned during the period $ 0.2 $ 0.3 $ 0.5 $ 0.9 Interest cost on accumulated postretirement benefit obligation 0.4 0.4 1.3 1.1 Expected return on plan assets (1.3 ) (1.3 ) (3.8 ) (3.9 ) Amortization of prior service (credit) cost — 0.1 (0.2 ) 0.2 Amortization of actuarial gain (0.1 ) — (0.4 ) — Subtotal (0.8 ) (0.5 ) (2.6 ) (1.7 ) Regulatory adjustment (0.5 ) (0.5 ) (1.4 ) (1.4 ) Net postretirement benefit income $ (1.3 ) $ (1.0 ) $ (4.0 ) $ (3.1 ) 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 2022 December 2022, 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 June 30, 2023

Note 10 - Information by Operat

Note 10 - Information by Operating Segment	9 Months Ended
	Jun. 30, 2023
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	10. 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, subsidiaries of Spire providing interstate and intrastate 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 June 30, 2023 Operating Revenues: Revenues from external customers $ 387.5 $ 23.1 $ 7.7 $ 0.2 $ — $ 418.5 Intersegment revenues 0.3 — 9.7 4.1 (14.1 ) — Total Operating Revenues 387.8 23.1 17.4 4.3 (14.1 ) 418.5 Operating Expenses: Natural gas 154.6 25.3 — — (10.1 ) 169.8 Operation and maintenance 111.7 4.2 8.1 5.5 (4.0 ) 125.5 Depreciation and amortization 61.7 0.3 2.1 0.2 — 64.3 Taxes, other than income taxes 45.9 0.4 0.7 (0.1 ) — 46.9 Total Operating Expenses 373.9 30.2 10.9 5.6 (14.1 ) 406.5 Operating Income (Loss) $ 13.9 $ (7.1 ) $ 6.5 $ (1.3 ) $ — $ 12.0 Net Economic (Loss) Earnings $ (12.3 ) $ (2.5 ) $ 3.6 $ (7.4 ) $ — $ (18.6 ) Gas Utility Gas Marketing Midstream Other Eliminations Consolidated Three Months Ended June 30, 2022 Operating Revenues: Revenues from external customers $ 377.4 $ 64.1 $ 6.3 $ 0.2 $ — $ 448.0 Intersegment revenues — — 8.3 3.9 (12.2 ) — Total Operating Revenues 377.4 64.1 14.6 4.1 (12.2 ) 448.0 Operating Expenses: Natural gas 144.5 67.1 — — (8.3 ) 203.3 Operation and maintenance 95.0 3.2 4.8 3.2 (3.9 ) 102.3 Depreciation and amortization 58.1 0.3 1.8 0.2 — 60.4 Taxes, other than income taxes 43.0 0.4 0.6 0.1 — 44.1 Total Operating Expenses 340.6 71.0 7.2 3.5 (12.2 ) 410.1 Operating Income (Loss) $ 36.8 $ (6.9 ) $ 7.4 $ 0.6 $ — $ 37.9 Net Economic Earnings (Loss) $ 4.2 $ 0.4 $ 4.3 $ (4.8 ) $ — $ 4.1 Gas Utility Gas Marketing Midstream Other Eliminations Consolidated Nine Months Ended June 30, 2023 Operating Revenues: Revenues from external customers $ 2,174.9 $ 157.8 $ 22.7 $ 0.5 $ — $ 2,355.9 Intersegment revenues 0.4 — 26.4 11.9 (38.7 ) — Total Operating Revenues 2,175.3 157.8 49.1 12.4 (38.7 ) 2,355.9 Operating Expenses: Natural gas 1,099.5 102.8 — — (26.8 ) 1,175.5 Operation and maintenance 350.9 16.2 20.1 14.4 (11.9 ) 389.7 Depreciation and amortization 181.6 1.0 6.0 0.4 — 189.0 Taxes, other than income taxes 176.2 1.1 1.9 — — 179.2 Total Operating Expenses 1,808.2 121.1 28.0 14.8 (38.7 ) 1,933.4 Operating Income (Loss) $ 367.1 $ 36.7 $ 21.1 $ (2.4 ) $ — $ 422.5 Net Economic Earnings (Loss) $ 234.5 $ 45.0 $ 11.6 $ (25.4 ) $ — $ 265.7 Gas Utility Gas Marketing Midstream Other Eliminations Consolidated Nine Months Ended June 30, 2022 Operating Revenues: Revenues from external customers $ 1,698.3 $ 171.4 $ 14.1 $ 0.5 $ — $ 1,884.3 Intersegment revenues — — 27.2 11.6 (38.8 ) — Total Operating Revenues 1,698.3 171.4 41.3 12.1 (38.8 ) 1,884.3 Operating Expenses: Natural gas 710.7 160.9 — — (27.1 ) 844.5 Operation and maintenance 306.5 9.1 16.4 11.6 (11.7 ) 331.9 Depreciation and amortization 169.2 1.0 5.6 0.4 — 176.2 Taxes, other than income taxes 150.3 0.8 2.1 0.1 — 153.3 Total Operating Expenses 1,336.7 171.8 24.1 12.1 (38.8 ) 1,505.9 Operating Income (Loss) $ 361.6 $ (0.4 ) $ 17.2 $ — $ — $ 378.4 Net Economic Earnings (Loss) $ 240.6 $ 15.3 $ 9.8 $ (18.0 ) $ — $ 247.7 The following table reconciles the Company’s net economic earnings (loss) to net income (loss). Three Months Ended June 30, Nine Months Ended June 30, 2023 2022 2023 2022 Net (Loss) Income $ (21.6 ) $ (1.4 ) $ 248.6 $ 227.9 Adjustments, pre-tax: Fair value and timing adjustments 3.4 7.3 22.2 20.9 Acquisition activities 0.5 — 0.5 — Income tax adjustments (0.9 ) (1.8 ) (5.6 ) (1.1 ) Net Economic (Loss) Earnings $ (18.6 ) $ 4.1 $ 265.7 $ 247.7 The Company’s total assets by segment were as follows: June 30, September 30, June 30, 2023 2022 2022 Total Assets: Gas Utility $ 8,283.2 $ 8,042.8 $ 7,854.7 Gas Marketing 316.6 638.7 595.5 Midstream 533.3 446.0 430.9 Other 2,134.1 2,449.2 2,222.0 Eliminations (1,229.7 ) (1,493.0 ) (1,319.2 ) Total Assets $ 10,037.5 $ 10,083.7 $ 9,783.9

Note 11 - Commitments and Conti

Note 11 - Commitments and Contingencies	9 Months Ended
	Jun. 30, 2023
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	11. Commitments The Company and the Utilities have entered into contracts with various counterparties, expiring on dates through calendar 2039, June 30, 2023 November April. In May 2023, A consolidated subsidiary of Spire is a limited partner in Inter-Atlantic Energy Capital Ventures, L.P., 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 June 30, 2023 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

Item 5 - Other Information

Item 5 - Other Information	9 Months Ended
	Jun. 30, 2023
Notes to Financial Statements
Issuer Rule 10b5-1, Material Terms [Text Block]	5. During the quarterly period ended June 30, 2023, no adopted terminated 10b5 1 10b5 1

Significant Accounting Policies

Significant Accounting Policies (Policies)	9 Months Ended
	Jun. 30, 2023
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 10 The Company’s earnings are derived primarily 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 5
Derivatives, Policy [Policy Text Block]	DERIVATIVES 815, Derivatives and Hedging not
Transactions With Affiliates [Policy Text Block]	TRANSACTIONS WITH AFFILIATES Three Months Ended June 30, Nine Months Ended June 30, 2023 2022 2023 2022 Spire Missouri Purchases of natural gas from Spire Marketing $ 6.5 $ 26.2 $ 48.8 $ 62.3 Transportation services received from Spire STL Pipeline 8.0 8.0 23.9 23.9 Sales of natural gas to Spire Marketing 0.3 — 0.4 — Spire Alabama Purchases of natural gas from Spire Marketing $ 1.7 $ 3.2 $ 2.8 $ 3.2
Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]	RESTRICTED CASH AND OTHER INVESTMENTS June 30, 2023 June 30, 2023 September 30, 2022 June 30, 2022,
Business Combinations Policy [Policy Text Block]	BUSINESS COMBINATIONS April 1, 2023. no
Accrued Capital Expenditures [Policy Text Block]	ACCRUED CAPITAL EXPENDITURES June 30, September 30, June 30, 2023 2022 2022 Spire $ 62.2 $ 77.8 $ 52.6 Spire Missouri 33.4 45.6 39.2 Spire Alabama 4.5 19.2 7.7
Receivable [Policy Text Block]	ACCOUNTS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES not Spire Spire Missouri Spire Alabama Three Months Ended June 30, 2023 2022 2023 2022 2023 2022 Allowance at beginning of period $ 40.6 $ 35.1 $ 34.5 $ 27.0 $ 5.3 $ 7.1 Provision for expected credit losses 1.2 1.9 0.3 1.8 0.8 — Write-offs, net of recoveries (7.1 ) (4.4 ) (6.1 ) (3.7 ) (0.8 ) (0.5 ) Allowance at end of period $ 34.7 $ 32.6 $ 28.7 $ 25.1 $ 5.3 $ 6.6 Nine Months Ended June 30, 2023 2022 2023 2022 2023 2022 Allowance at beginning of period $ 31.9 $ 30.3 $ 24.9 $ 22.6 $ 6.3 $ 6.6 Provision for expected credit losses 13.5 8.6 11.4 8.6 1.5 — Write-offs, net of recoveries (10.7 ) (6.3 ) (7.6 ) (6.1 ) (2.5 ) — Allowance at end of period $ 34.7 $ 32.6 $ 28.7 $ 25.1 $ 5.3 $ 6.6

Note 1 - Summary of Significa_2

Note 1 - Summary of Significant Accounting Policies (Tables)	9 Months Ended
	Jun. 30, 2023
Notes Tables
Schedule of Related Party Transactions [Table Text Block]	Three Months Ended June 30, Nine Months Ended June 30, 2023 2022 2023 2022 Spire Missouri Purchases of natural gas from Spire Marketing $ 6.5 $ 26.2 $ 48.8 $ 62.3 Transportation services received from Spire STL Pipeline 8.0 8.0 23.9 23.9 Sales of natural gas to Spire Marketing 0.3 — 0.4 — Spire Alabama Purchases of natural gas from Spire Marketing $ 1.7 $ 3.2 $ 2.8 $ 3.2
Schedule Of Capital Expenditure Excluded From Statement Of Cash Flow [Table Text Block]	June 30, September 30, June 30, 2023 2022 2022 Spire $ 62.2 $ 77.8 $ 52.6 Spire Missouri 33.4 45.6 39.2 Spire Alabama 4.5 19.2 7.7
Accounts Receivable, Allowance for Credit Loss [Table Text Block]	Spire Spire Missouri Spire Alabama Three Months Ended June 30, 2023 2022 2023 2022 2023 2022 Allowance at beginning of period $ 40.6 $ 35.1 $ 34.5 $ 27.0 $ 5.3 $ 7.1 Provision for expected credit losses 1.2 1.9 0.3 1.8 0.8 — Write-offs, net of recoveries (7.1 ) (4.4 ) (6.1 ) (3.7 ) (0.8 ) (0.5 ) Allowance at end of period $ 34.7 $ 32.6 $ 28.7 $ 25.1 $ 5.3 $ 6.6 Nine Months Ended June 30, 2023 2022 2023 2022 2023 2022 Allowance at beginning of period $ 31.9 $ 30.3 $ 24.9 $ 22.6 $ 6.3 $ 6.6 Provision for expected credit losses 13.5 8.6 11.4 8.6 1.5 — Write-offs, net of recoveries (10.7 ) (6.3 ) (7.6 ) (6.1 ) (2.5 ) — Allowance at end of period $ 34.7 $ 32.6 $ 28.7 $ 25.1 $ 5.3 $ 6.6

Note 2 - Revenue (Tables)

Note 2 - Revenue (Tables)	9 Months Ended
	Jun. 30, 2023
Notes Tables
Disaggregation of Revenue [Table Text Block]	Three Months Ended June 30, Nine Months Ended June 30, 2023 2022 2023 2022 Spire Gas Utility: Residential $ 238.1 $ 239.5 $ 1,486.3 $ 1,268.8 Commercial and industrial 102.2 86.2 533.1 275.6 Transportation 29.0 26.9 93.2 91.6 Off-system and other incentive 8.2 10.1 21.9 26.9 Other customer revenue 5.1 5.6 13.8 15.7 Total revenue from contracts with customers 382.6 368.3 2,148.3 1,678.6 Changes in accrued revenue under alternative revenue programs 5.2 9.1 27.0 19.7 Total Gas Utility operating revenues 387.8 377.4 2,175.3 1,698.3 Gas Marketing 23.1 64.1 157.8 171.4 Midstream 17.4 14.6 49.1 41.3 Other 4.3 4.1 12.4 12.1 Total before eliminations 432.6 460.2 2,394.6 1,923.1 Intersegment eliminations (see Note 10, Information by Operating Segment) (14.1 ) (12.2 ) (38.7 ) (38.8 ) Total Operating Revenues $ 418.5 $ 448.0 $ 2,355.9 $ 1,884.3 Spire Missouri Residential $ 171.7 $ 171.1 $ 1,142.3 $ 947.3 Commercial and industrial 61.1 51.9 369.2 140.0 Transportation 7.1 7.1 26.1 26.4 Off-system and other incentive 6.0 4.5 15.6 20.3 Other customer revenue 3.8 3.2 10.1 9.1 Total revenue from contracts with customers 249.7 237.8 1,563.3 1,143.1 Changes in accrued revenue under alternative revenue programs 4.1 (1.1 ) 22.7 12.7 Total Operating Revenues $ 253.8 $ 236.7 $ 1,586.0 $ 1,155.8 Spire Alabama Residential $ 56.7 $ 56.2 $ 288.1 $ 266.2 Commercial and industrial 32.7 24.0 127.8 101.6 Transportation 18.9 17.4 59.0 57.5 Off-system and other incentive 2.2 5.6 6.3 6.6 Other customer revenue 0.8 1.5 2.7 4.2 Total revenue from contracts with customers 111.3 104.7 483.9 436.1 Changes in accrued revenue under alternative revenue programs 1.8 11.0 (0.1 ) 10.3 Total Operating Revenues $ 113.1 $ 115.7 $ 483.8 $ 446.4
Schedule Of Taxes On Revenues [Table Text Block]	Three Months Ended June 30, Nine Months Ended June 30, 2023 2022 2023 2022 Spire $ 26.0 $ 23.3 $ 116.6 $ 97.1 Spire Missouri 18.9 16.7 86.6 70.6 Spire Alabama 6.1 5.5 25.5 22.5

Note 3 - Earnings Per Common _2

Note 3 - Earnings Per Common Share (Tables)	9 Months Ended
	Jun. 30, 2023
Notes Tables
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	Three Months Ended June 30, Nine Months Ended June 30, 2023 2022 2023 2022 Basic Earnings Per Common Share: Net (Loss) Income $ (21.6 ) $ (1.4 ) $ 248.6 $ 227.9 Less: Provision for preferred dividends 3.7 3.7 11.1 11.1 (Loss) income allocated to participating securities (0.1 ) — 0.4 0.3 (Loss) Income Available to Common Shareholders $ (25.2 ) $ (5.1 ) $ 237.1 $ 216.5 Weighted Average Common Shares Outstanding (in millions) 52.5 52.2 52.5 51.9 Basic (Loss) Earnings Per Common Share $ (0.48 ) $ (0.10 ) $ 4.52 $ 4.17 Diluted Earnings Per Common Share: Net (Loss) Income $ (21.6 ) $ (1.4 ) $ 248.6 $ 227.9 Less: Provision for preferred dividends 3.7 3.7 11.1 11.1 (Loss) income allocated to participating securities (0.1 ) — 0.4 0.3 (Loss) Income Available to Common Shareholders $ (25.2 ) $ (5.1 ) $ 237.1 $ 216.5 Weighted Average Common Shares Outstanding (in millions) 52.5 52.2 52.5 51.9 Dilutive Effect of forward sales of common stock, restricted stock and restricted stock units (in millions)* — — 0.1 0.1 Weighted Average Diluted Common Shares (in millions) 52.5 52.2 52.6 52.0 Diluted (Loss) Earnings Per Common Share $ (0.48 ) $ (0.10 ) $ 4.51 $ 4.16 * Calculation excludes certain outstanding or potential common shares (shown in millions by period at the right) attributable to (1) forward sales of common stock, (2) stock units subject to performance or market conditions, and (3) restricted stock, which could have a dilutive effect in the future 2.7 0.2 2.5 0.2

Note 5 - Regulatory Matters (Ta

Note 5 - Regulatory Matters (Tables)	9 Months Ended
	Jun. 30, 2023
Notes Tables
Schedule of Regulatory Assets and Liabilities [Table Text Block]	June 30, September 30, June 30, Spire 2023 2022 2022 Regulatory Assets: Current: Unamortized purchased gas adjustments $ 66.2 $ 322.2 $ 123.4 Other 27.1 33.2 28.6 Total Current Regulatory Assets 93.3 355.4 152.0 Noncurrent: Pension and postretirement benefit costs 268.8 294.5 317.5 Cost of removal 597.9 493.7 471.9 Future income taxes due from customers 140.1 137.8 140.4 Energy efficiency 55.8 57.2 54.1 Unamortized purchased gas adjustments 206.3 — 97.4 Other 152.3 129.2 124.3 Total Noncurrent Regulatory Assets 1,421.2 1,112.4 1,205.6 Total Regulatory Assets $ 1,514.5 $ 1,467.8 $ 1,357.6 Regulatory Liabilities: Current: Other $ 5.5 $ 3.7 $ 3.2 Total Current Regulatory Liabilities 5.5 3.7 3.2 Noncurrent: Deferred taxes due to customers 131.8 145.3 148.7 Pension and postretirement benefit costs 165.3 172.6 185.0 Accrued cost of removal 107.7 32.9 40.7 Unamortized purchased gas adjustments — 53.0 — Other 23.3 14.4 14.6 Total Noncurrent Regulatory Liabilities 428.1 418.2 389.0 Total Regulatory Liabilities $ 433.6 $ 421.9 $ 392.2 June 30, September 30, June 30, Spire Missouri 2023 2022 2022 Regulatory Assets: Current: Unamortized purchased gas adjustments $ 32.9 $ 275.1 $ 89.7 Other 2.1 13.0 0.2 Total Current Regulatory Assets 35.0 288.1 89.9 Noncurrent: Future income taxes due from customers 131.8 129.2 131.8 Pension and postretirement benefit costs 193.4 222.9 238.5 Energy efficiency 55.8 57.2 54.1 Unamortized purchased gas adjustments 206.3 — 97.4 Cost of removal 95.3 25.2 34.9 Other 136.5 113.1 107.9 Total Noncurrent Regulatory Assets 819.1 547.6 664.6 Total Regulatory Assets $ 854.1 $ 835.7 $ 754.5 Regulatory Liabilities: Noncurrent: Deferred taxes due to customers $ 118.1 $ 127.9 $ 131.3 Pension and postretirement benefit costs 137.9 143.6 154.5 Accrued cost of removal 72.3 — 7.3 Unamortized purchased gas adjustments — 53.0 — Other 17.8 7.3 7.7 Total Noncurrent Regulatory Liabilities 346.1 331.8 300.8 Total Regulatory Liabilities $ 346.1 $ 331.8 $ 300.8 June 30, September 30, June 30, Spire Alabama 2023 2022 2022 Regulatory Assets: Current: Unamortized purchased gas adjustments $ 30.9 $ 43.8 $ 31.6 Other 13.0 13.1 21.3 Total Current Regulatory Assets 43.9 56.9 52.9 Noncurrent: Future income taxes due from customers 2.0 2.2 2.2 Pension and postretirement benefit costs 71.1 66.5 73.8 Cost of removal 502.6 468.5 437.0 Other 1.0 1.0 1.1 Total Noncurrent Regulatory Assets 576.7 538.2 514.1 Total Regulatory Assets $ 620.6 $ 595.1 $ 567.0 Regulatory Liabilities: Noncurrent: Pension and postretirement benefit costs $ 17.3 $ 19.4 $ 20.4 Other 3.5 3.6 3.6 Total Noncurrent Regulatory Liabilities 20.8 23.0 24.0 Total Regulatory Liabilities $ 20.8 $ 23.0 $ 24.0
Schedule of Regulatory Assets Not Earning Return [Table Text Block]	June 30, September 30, June 30, 2023 2022 2022 Spire Pension and postretirement benefit costs $ 127.5 $ 152.9 $ 165.8 Future income taxes due from customers 138.0 135.6 138.2 Unamortized purchased gas adjustments 239.2 275.1 187.2 Other 102.2 122.7 130.9 Total Regulatory Assets Not Earning a Return $ 606.9 $ 686.3 $ 622.1 Spire Missouri Pension and postretirement benefit costs $ 127.5 $ 152.9 $ 165.8 Future income taxes due from customers 131.8 129.2 131.8 Unamortized purchased gas adjustments 239.2 275.1 187.2 Other 102.2 122.7 130.9 Total Regulatory Assets Not Earning a Return $ 600.7 $ 679.9 $ 615.7

Note 6 - Financing (Tables)

Note 6 - Financing (Tables)	9 Months Ended
	Jun. 30, 2023
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 Nine Months Ended June 30, 2023 Highest borrowings outstanding $ 1,282.0 $ 250.0 $ 656.9 $ 274.0 $ 1,482.0 Lowest borrowings outstanding 354.4 — 3.8 76.7 489.0 Weighted average borrowings 778.7 89.4 308.9 123.3 868.1 Weighted average interest rate 4.7 % 5.5 % 4.6 % 4.8 % 4.8 % As of June 30, 2023 Borrowings outstanding $ 557.6 $ — $ 228.1 $ 108.1 $ 557.6 Weighted average interest rate 5.5 % — % 5.5 % 5.5 % 5.5 % As of September 30, 2022 Borrowings outstanding $ 1,037.5 $ — $ 445.3 $ 260.9 $ 1,037.5 Weighted average interest rate 3.3 % n/a 3.3 % 3.3 % 3.3 % As of June 30, 2022 Borrowings outstanding $ 709.2 $ — $ 285.4 $ 196.3 $ 709.2 Weighted average interest rate 2.0 % n/a 2.0 % 2.0 % 2.0 %
Summary Of Capitalized Interest [Table Text Block]	Three Months Ended June 30, Nine Months Ended June 30, 2023 2022 2023 2022 Spire $ 2.3 $ 1.1 $ 5.8 $ 3.2 Spire Missouri 1.0 0.2 2.1 0.3 Spire Alabama 0.5 0.9 1.8 2.5

Note 7 - Fair Value of Financ_2

Note 7 - Fair Value of Financial Instruments (Tables)	9 Months Ended
	Jun. 30, 2023
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 June 30, 2023 Cash and cash equivalents $ 5.3 $ 5.3 $ 5.3 $ — Notes payable 557.6 557.6 — 557.6 Long-term debt, including current portion 3,959.9 3,650.7 — 3,650.7 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 June 30, 2022 Cash and cash equivalents $ 16.0 $ 16.0 $ 16.0 $ — Notes payable 709.2 709.2 — 709.2 Long-term debt, including current portion 3,239.1 3,032.1 — 3,032.1 Spire Missouri As of June 30, 2023 Notes payable – associated companies $ 228.1 $ 228.1 $ — $ 228.1 Long-term debt, including current portion 2,035.1 1,890.2 — 1,890.2 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 June 30, 2022 Cash and cash equivalents $ 7.0 $ 7.0 $ 7.0 $ — Notes payable – associated companies 285.4 285.4 — 285.4 Long-term debt 1,637.4 1,562.4 — 1,562.4 Spire Alabama As of June 30, 2023 Cash and cash equivalents $ 0.5 $ 0.5 $ 0.5 $ — Notes payable – associated companies 108.1 108.1 — 108.1 Long-term debt 745.8 681.5 — 681.5 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 June 30, 2022 Cash and cash equivalents $ 3.7 $ 3.7 $ 3.7 $ — Notes payable – associated companies 196.3 196.3 — 196.3 Long-term debt 571.4 527.2 — 527.2

Note 8 - Fair Value Measureme_2

Note 8 - Fair Value Measurements (Tables)	9 Months Ended
	Jun. 30, 2023
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 June 30, 2023 ASSETS Gas Utility: U.S. stock/bond mutual funds $ 21.4 $ — $ — $ 21.4 Gas Marketing: NYMEX/ICE natural gas contracts 10.5 — (10.5 ) — Natural gas commodity contracts 35.8 — (1.0 ) 34.8 Other: U.S. stock/bond mutual funds 31.4 — — 31.4 Interest rate swaps — 22.8 — 22.8 Total $ 99.1 $ 22.8 $ (11.5 ) $ 110.4 LIABILITIES Gas Utility: NYMEX/ICE natural gas contracts $ 44.8 $ — $ (44.8 ) $ — Gasoline and heating oil contracts 0.7 — (0.7 ) — Gas Marketing: NYMEX/ICE natural gas contracts 24.3 — (24.3 ) — Natural gas commodity contracts 34.9 — (1.0 ) 33.9 Other: Interest rate swaps — 0.8 — 0.8 Total $ 104.7 $ 0.8 $ (70.8 ) $ 34.7 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 $ 254.6 $ 63.6 $ (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 June 30, 2022 ASSETS Gas Utility: U.S. stock/bond mutual funds $ 20.3 $ — $ — $ 20.3 NYMEX/ICE natural gas contracts 39.6 — (39.6 ) — Gas Marketing: NYMEX/ICE natural gas contracts 94.2 — (94.2 ) — Natural gas commodity contracts 57.6 — (5.3 ) 52.3 Other: U.S. stock/bond mutual funds 31.6 — — 31.6 Interest rate swaps — 52.7 (7.6 ) 45.1 Total $ 243.3 $ 52.7 $ (146.7 ) $ 149.3 LIABILITIES Gas Utility: NYMEX/ICE natural gas contracts $ 12.8 $ — $ (12.8 ) $ — Gas Marketing: NYMEX/ICE natural gas contracts 60.8 — (60.8 ) — Natural gas commodity contracts 118.3 — (5.3 ) 113.0 Other: Interest rate swaps — 7.6 (7.6 ) — Total $ 191.9 $ 7.6 $ (86.5 ) $ 113.0 Quoted Prices in Active Markets (Level 1) Significant Observable Inputs (Level 2) Effects of Netting and Cash Margin Receivables /Payables Total As of June 30, 2023 ASSETS U.S. stock/bond mutual funds $ 21.4 $ — $ — $ 21.4 LIABILITIES NYMEX/ICE natural gas contracts $ 44.8 $ — $ (44.8 ) $ — Gasoline and heating oil contracts 0.7 — (0.7 ) — Total $ 45.5 $ — $ (45.5 ) $ — 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 June 30, 2022 ASSETS U.S. stock/bond mutual funds $ 20.3 $ — $ — $ 20.3 NYMEX/ICE natural gas contracts 39.6 — (39.6 ) — Total $ 59.9 $ — $ (39.6 ) $ 20.3 LIABILITIES NYMEX/ICE natural gas contracts $ 12.8 $ — $ (12.8 ) $ —

Note 9 - Pension Plans and Ot_2

Note 9 - Pension Plans and Other Postretirement Benefits (Tables)	9 Months Ended
	Jun. 30, 2023
Notes Tables
Schedule of Net Benefit Costs [Table Text Block]	Three Months Ended June 30, Nine Months Ended June 30, 2023 2022 2023 2022 Spire Service cost – benefits earned during the period $ 4.2 $ 4.8 $ 12.2 $ 15.6 Interest cost on projected benefit obligation 6.6 5.4 18.9 15.8 Expected return on plan assets (6.4 ) (7.7 ) (18.5 ) (24.1 ) Amortization of prior service credit (1.1 ) (1.1 ) (3.4 ) (3.4 ) Amortization of actuarial loss 1.5 2.5 4.7 9.8 Loss on lump-sum settlements — 17.8 8.6 29.5 Subtotal 4.8 21.7 22.5 43.2 Regulatory adjustment 6.1 (6.9 ) 18.3 2.5 Net pension cost $ 10.9 $ 14.8 $ 40.8 $ 45.7 Spire Missouri Service cost – benefits earned during the period $ 2.8 $ 3.5 $ 8.5 $ 11.2 Interest cost on projected benefit obligation 4.5 3.8 13.4 10.9 Expected return on plan assets (4.5 ) (5.7 ) (13.5 ) (17.6 ) Amortization of prior service credit (0.5 ) (0.5 ) (1.5 ) (1.5 ) Amortization of actuarial loss 1.5 2.0 4.6 7.6 Loss on lump-sum settlements — 17.3 — 24.1 Subtotal 3.8 20.4 11.5 34.7 Regulatory adjustment 3.4 (8.3 ) 19.6 1.3 Net pension cost $ 7.2 $ 12.1 $ 31.1 $ 36.0 Spire Alabama Service cost – benefits earned during the period $ 1.3 $ 1.1 $ 3.2 $ 3.8 Interest cost on projected benefit obligation 1.5 1.1 3.6 3.4 Expected return on plan assets (1.1 ) (1.2 ) (2.7 ) (4.0 ) Amortization of prior service credit (0.6 ) (0.6 ) (1.8 ) (1.8 ) Amortization of actuarial loss 0.1 0.5 0.4 2.2 Loss on lump-sum settlements — 0.5 8.6 5.4 Subtotal 1.2 1.4 11.3 9.0 Regulatory adjustment 2.4 1.1 (2.0 ) 0.5 Net pension cost $ 3.6 $ 2.5 $ 9.3 $ 9.5 Three Months Ended June 30, Nine Months Ended June 30, 2023 2022 2023 2022 Spire Service cost – benefits earned during the period $ 1.2 $ 1.9 $ 3.6 $ 5.8 Interest cost on accumulated postretirement benefit obligation 2.0 1.6 6.3 4.6 Expected return on plan assets (4.0 ) (4.3 ) (11.8 ) (12.8 ) Amortization of prior service cost 0.1 0.3 0.2 0.8 Amortization of actuarial gain (0.9 ) (0.5 ) (3.0 ) (1.7 ) Subtotal (1.6 ) (1.0 ) (4.7 ) (3.3 ) Regulatory adjustment (0.5 ) (0.1 ) (0.2 ) 3.2 Net postretirement benefit income $ (2.1 ) $ (1.1 ) $ (4.9 ) $ (0.1 ) Spire Missouri Service cost – benefits earned during the period $ 1.0 $ 1.6 $ 3.0 $ 4.8 Interest cost on accumulated postretirement benefit obligation 1.6 1.2 4.9 3.4 Expected return on plan assets (2.6 ) (2.9 ) (7.9 ) (8.6 ) Amortization of prior service cost 0.1 0.2 0.4 0.6 Amortization of actuarial gain (0.8 ) (0.5 ) (2.4 ) (1.5 ) Subtotal (0.7 ) (0.4 ) (2.0 ) (1.3 ) Regulatory adjustment (0.2 ) 0.4 1.1 4.5 Net postretirement benefit cost $ (0.9 ) $ — $ (0.9 ) $ 3.2 Spire Alabama Service cost – benefits earned during the period $ 0.2 $ 0.3 $ 0.5 $ 0.9 Interest cost on accumulated postretirement benefit obligation 0.4 0.4 1.3 1.1 Expected return on plan assets (1.3 ) (1.3 ) (3.8 ) (3.9 ) Amortization of prior service (credit) cost — 0.1 (0.2 ) 0.2 Amortization of actuarial gain (0.1 ) — (0.4 ) — Subtotal (0.8 ) (0.5 ) (2.6 ) (1.7 ) Regulatory adjustment (0.5 ) (0.5 ) (1.4 ) (1.4 ) Net postretirement benefit income $ (1.3 ) $ (1.0 ) $ (4.0 ) $ (3.1 )

Note 10 - Information by Oper_2

Note 10 - Information by Operating Segment (Tables)	9 Months Ended
	Jun. 30, 2023
Notes Tables
Schedule of Segment Reporting Information, by Segment [Table Text Block]	Gas Utility Gas Marketing Midstream Other Eliminations Consolidated Three Months Ended June 30, 2023 Operating Revenues: Revenues from external customers $ 387.5 $ 23.1 $ 7.7 $ 0.2 $ — $ 418.5 Intersegment revenues 0.3 — 9.7 4.1 (14.1 ) — Total Operating Revenues 387.8 23.1 17.4 4.3 (14.1 ) 418.5 Operating Expenses: Natural gas 154.6 25.3 — — (10.1 ) 169.8 Operation and maintenance 111.7 4.2 8.1 5.5 (4.0 ) 125.5 Depreciation and amortization 61.7 0.3 2.1 0.2 — 64.3 Taxes, other than income taxes 45.9 0.4 0.7 (0.1 ) — 46.9 Total Operating Expenses 373.9 30.2 10.9 5.6 (14.1 ) 406.5 Operating Income (Loss) $ 13.9 $ (7.1 ) $ 6.5 $ (1.3 ) $ — $ 12.0 Net Economic (Loss) Earnings $ (12.3 ) $ (2.5 ) $ 3.6 $ (7.4 ) $ — $ (18.6 ) Gas Utility Gas Marketing Midstream Other Eliminations Consolidated Three Months Ended June 30, 2022 Operating Revenues: Revenues from external customers $ 377.4 $ 64.1 $ 6.3 $ 0.2 $ — $ 448.0 Intersegment revenues — — 8.3 3.9 (12.2 ) — Total Operating Revenues 377.4 64.1 14.6 4.1 (12.2 ) 448.0 Operating Expenses: Natural gas 144.5 67.1 — — (8.3 ) 203.3 Operation and maintenance 95.0 3.2 4.8 3.2 (3.9 ) 102.3 Depreciation and amortization 58.1 0.3 1.8 0.2 — 60.4 Taxes, other than income taxes 43.0 0.4 0.6 0.1 — 44.1 Total Operating Expenses 340.6 71.0 7.2 3.5 (12.2 ) 410.1 Operating Income (Loss) $ 36.8 $ (6.9 ) $ 7.4 $ 0.6 $ — $ 37.9 Net Economic Earnings (Loss) $ 4.2 $ 0.4 $ 4.3 $ (4.8 ) $ — $ 4.1 Gas Utility Gas Marketing Midstream Other Eliminations Consolidated Nine Months Ended June 30, 2022 Operating Revenues: Revenues from external customers $ 1,698.3 $ 171.4 $ 14.1 $ 0.5 $ — $ 1,884.3 Intersegment revenues — — 27.2 11.6 (38.8 ) — Total Operating Revenues 1,698.3 171.4 41.3 12.1 (38.8 ) 1,884.3 Operating Expenses: Natural gas 710.7 160.9 — — (27.1 ) 844.5 Operation and maintenance 306.5 9.1 16.4 11.6 (11.7 ) 331.9 Depreciation and amortization 169.2 1.0 5.6 0.4 — 176.2 Taxes, other than income taxes 150.3 0.8 2.1 0.1 — 153.3 Total Operating Expenses 1,336.7 171.8 24.1 12.1 (38.8 ) 1,505.9 Operating Income (Loss) $ 361.6 $ (0.4 ) $ 17.2 $ — $ — $ 378.4 Net Economic Earnings (Loss) $ 240.6 $ 15.3 $ 9.8 $ (18.0 ) $ — $ 247.7
Reconciliation Of Consolidated Net Economic Earnings To Consolidated Net Income [Table Text Block]	Gas Utility Gas Marketing Midstream Other Eliminations Consolidated Nine Months Ended June 30, 2023 Operating Revenues: Revenues from external customers $ 2,174.9 $ 157.8 $ 22.7 $ 0.5 $ — $ 2,355.9 Intersegment revenues 0.4 — 26.4 11.9 (38.7 ) — Total Operating Revenues 2,175.3 157.8 49.1 12.4 (38.7 ) 2,355.9 Operating Expenses: Natural gas 1,099.5 102.8 — — (26.8 ) 1,175.5 Operation and maintenance 350.9 16.2 20.1 14.4 (11.9 ) 389.7 Depreciation and amortization 181.6 1.0 6.0 0.4 — 189.0 Taxes, other than income taxes 176.2 1.1 1.9 — — 179.2 Total Operating Expenses 1,808.2 121.1 28.0 14.8 (38.7 ) 1,933.4 Operating Income (Loss) $ 367.1 $ 36.7 $ 21.1 $ (2.4 ) $ — $ 422.5 Net Economic Earnings (Loss) $ 234.5 $ 45.0 $ 11.6 $ (25.4 ) $ — $ 265.7 Three Months Ended June 30, Nine Months Ended June 30, 2023 2022 2023 2022 Net (Loss) Income $ (21.6 ) $ (1.4 ) $ 248.6 $ 227.9 Adjustments, pre-tax: Fair value and timing adjustments 3.4 7.3 22.2 20.9 Acquisition activities 0.5 — 0.5 — Income tax adjustments (0.9 ) (1.8 ) (5.6 ) (1.1 ) Net Economic (Loss) Earnings $ (18.6 ) $ 4.1 $ 265.7 $ 247.7
Reconciliation of Assets from Segment to Consolidated [Table Text Block]	June 30, September 30, June 30, 2023 2022 2022 Total Assets: Gas Utility $ 8,283.2 $ 8,042.8 $ 7,854.7 Gas Marketing 316.6 638.7 595.5 Midstream 533.3 446.0 430.9 Other 2,134.1 2,449.2 2,222.0 Eliminations (1,229.7 ) (1,493.0 ) (1,319.2 ) Total Assets $ 10,037.5 $ 10,083.7 $ 9,783.9

Note 1 - Summary of Significa_3

Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Millions	6 Months Ended	9 Months Ended
	Jun. 30, 2023	Jun. 30, 2023	Jun. 30, 2022	Sep. 30, 2022
Restricted Cash	$ 19.7	$ 19.7	$ 14.1	$ 14
Payments to Acquire Businesses, Gross	$ 37	$ 37	$ 0

Note 1 - Summary of Significa_4

Note 1 - Summary of Significant Accounting Policies - Transactions with Affiliates (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Unregulated Operation [Member] | Spire S T L Pipeline L L C [Member] | Spire Missouri [Member]
Transportation services received from Spire STL Pipeline	$ 0.3	$ 0	$ 0.4	$ 0
Affiliated Entity [Member] | Regulated Operation [Member] | Spire Marketing [Member] | Spire Missouri [Member]
Purchases of natural gas from Spire Marketing	6.5	26.2	48.8	62.3
Affiliated Entity [Member] | Regulated Operation [Member] | Spire Marketing [Member] | Spire Alabama Inc [Member]
Purchases of natural gas from Spire Marketing	1.7	3.2	2.8	3.2
Affiliated Entity [Member] | Unregulated Operation [Member] | Spire S T L Pipeline L L C [Member] | Spire Missouri [Member]
Transportation services received from Spire STL Pipeline	$ 8	$ 8	$ 23.9	$ 23.9

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	9 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Sep. 30, 2022
Accrued capital expenditures	$ 62.2	$ 52.6	$ 77.8
Spire Missouri [Member]
Accrued capital expenditures	33.4	39.2	45.6
Spire Alabama Inc [Member]
Accrued capital expenditures	$ 4.5	$ 7.7	$ 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	6 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Allowance at beginning of period	$ 40.6	$ 35.1	$ 31.9	$ 30.3
Provision for expected credit losses	1.2	1.9	13.5	8.6
Write-offs, net of recoveries	(7.1)	(4.4)	(10.7)	(6.3)
Allowance at end of period	34.7	32.6	34.7	32.6
Spire Missouri [Member]
Allowance at beginning of period	34.5	27	24.9	22.6
Provision for expected credit losses	0.3	1.8	11.4	8.6
Write-offs, net of recoveries	(6.1)	(3.7)	(7.6)	(6.1)
Allowance at end of period	28.7	25.1	28.7	25.1
Spire Alabama Inc [Member]
Allowance at beginning of period	5.3	7.1	6.3	6.6
Provision for expected credit losses	0.8	0	1.5	0
Write-offs, net of recoveries	(0.8)	(0.5)	(2.5)	0
Allowance at end of period	$ 5.3	$ 6.6	$ 5.3	$ 6.6

Note 2 - Revenue - Disaggregate

Note 2 - Revenue - Disaggregated of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Operating Revenues	$ 418.5	$ 448	$ 2,355.9	$ 1,884.3
Operating Segments [Member]
Operating Revenues			38.7
Consolidation, Eliminations [Member]
Operating Revenues	(14.1)	(12.2)		(38.8)
Gas Utility [Member] | Operating Segments [Member]
Operating Revenues	387.8	377.4	2,175.3	1,698.3
Gas Marketing [Member] | Operating Segments [Member]
Operating Revenues	23.1	64.1	157.8	171.4
Midstream [Member] | Operating Segments [Member]
Operating Revenues	17.4	14.6	49.1	41.3
Other Segments [Member]
Operating Revenues	4.3	4.1	12.4	12.1
Spire Missouri [Member]
Operating Revenues	253.8	236.7	1,586	1,155.8
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member]
Revenue	249.7	237.8	1,563.3	1,143.1
Changes in accrued revenue under alternative revenue programs	4.1	(1.1)	22.7	12.7
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member] | Residential [Member]
Revenue	171.7	171.1	1,142.3	947.3
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member] | Commercial and Industrial [Member]
Revenue	61.1	51.9	369.2	140
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member] | Transportation [Member]
Revenue	7.1	7.1	26.1	26.4
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member] | Off-system and Other Incentive [Member]
Revenue	6	4.5	15.6	20.3
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member] | Other Customer Revenue [Member]
Revenue	3.8	3.2	10.1	9.1
Spire Alabama Inc [Member]
Operating Revenues	113.1	115.7	483.8	446.4
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member]
Revenue	111.3	104.7	483.9	436.1
Changes in accrued revenue under alternative revenue programs	1.8	11	(0.1)	10.3
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member] | Residential [Member]
Revenue	56.7	56.2	288.1	266.2
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member] | Commercial and Industrial [Member]
Revenue	32.7	24	127.8	101.6
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member] | Transportation [Member]
Revenue	18.9	17.4	59	57.5
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member] | Off-system and Other Incentive [Member]
Revenue	2.2	5.6	6.3	6.6
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member] | Other Customer Revenue [Member]
Revenue	0.8	1.5	2.7	4.2
Spire [Member]
Operating Revenues	418.5	448	2,355.9	1,884.3
Spire [Member] | Operating Segments [Member]
Operating Revenues	432.6	460.2	2,394.6	1,923.1
Spire [Member] | Consolidation, Eliminations [Member]
Operating Revenues	(14.1)	(12.2)	(38.7)	(38.8)
Spire [Member] | Gas Utility [Member] | Operating Segments [Member]
Revenue	382.6	368.3	2,148.3	1,678.6
Changes in accrued revenue under alternative revenue programs	5.2	9.1	27	19.7
Total Gas Utility operating revenues	387.8	377.4	2,175.3	1,698.3
Spire [Member] | Gas Utility [Member] | Operating Segments [Member] | Residential [Member]
Revenue	238.1	239.5	1,486.3	1,268.8
Spire [Member] | Gas Utility [Member] | Operating Segments [Member] | Commercial and Industrial [Member]
Revenue	102.2	86.2	533.1	275.6
Spire [Member] | Gas Utility [Member] | Operating Segments [Member] | Transportation [Member]
Revenue	29	26.9	93.2	91.6
Spire [Member] | Gas Utility [Member] | Operating Segments [Member] | Off-system and Other Incentive [Member]
Revenue	8.2	10.1	21.9	26.9
Spire [Member] | Gas Utility [Member] | Operating Segments [Member] | Other Customer Revenue [Member]
Revenue	5.1	5.6	13.8	15.7
Spire [Member] | Gas Marketing [Member] | Operating Segments [Member]
Unregulated Operating Revenue	23.1	64.1	157.8	171.4
Spire [Member] | Midstream [Member] | Operating Segments [Member]
Unregulated Operating Revenue	17.4	14.6	49.1	41.3
Spire [Member] | Other Segments [Member] | Operating Segments [Member]
Unregulated Operating Revenue	$ 4.3	$ 4.1	$ 12.4	$ 12.1

Note 2 - Revenue - Taxes Associ

Note 2 - Revenue - Taxes Associated with Natural Gas Utility Services (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Gross Receipts Tax Amounts	$ 26	$ 23.3	$ 116.6	$ 97.1
Spire Missouri [Member]
Gross Receipts Tax Amounts	18.9	16.7	86.6	70.6
Spire Alabama Inc [Member]
Gross Receipts Tax Amounts	$ 6.1	$ 5.5	$ 25.5	$ 22.5

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		9 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Net Income		$ (21.6)	$ (1.4)	$ 248.6	$ 227.9
Provision for preferred dividends		3.7	3.7	11.1	11.1
(Loss) income allocated to participating securities		(0.1)	0	0.4	0.3
(Loss) Income Available to Common Shareholders		$ (25.2)	$ (5.1)	$ 237.1	$ 216.5
Basic (in shares)		52.5	52.2	52.5	51.9
Basic (Loss) Earnings Per Common Share (in dollars per share)		$ (0.48)	$ (0.10)	$ 4.52	$ 4.17
Dilutive Effect of forward sales of common stock, restricted stock and restricted stock units (in millions)* (in shares)	[1]	0	0	0.1	0.1
Weighted Average Diluted Common Shares (in millions) (in shares)		52.5	52.2	52.6	52
Diluted (Loss) Earnings Per Common Share (in dollars per share)		$ (0.48)	$ (0.10)	$ 4.51	$ 4.16
* Calculation excludes certain outstanding or potential common shares (shown in millions by period at the right) attributable to (1) forward sales of common stock, (2) stock units subject to performance or market conditions, and (3) restricted stock, which could have a dilutive effect in the future (in shares)		2.7	0.2	2.5	0.2
[1]Calculation excludes certain outstanding or potential common shares (shown in millions by period at the right) attributable to (1) forward sales of common stock, (2) stock units subject to performance or market conditions, and (3) restricted stock, which could have a dilutive effect in the future

Note 4 - Shareholders' Equity (

Note 4 - Shareholders' Equity (Details Textual) - At The Market Program [Member] - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Apr. 28, 2022
Number of Shares Authorized for Issuance (in shares)	17,900,000		200,000,000
Forward Sales Agreements, Shares (in shares)	2,087,231	228,690
Forward Sales Agreements, Block Sales, Shares (in shares)	1,744,549
Forward Sales Agreements, Proceeds If Settled	$ 149.7

Note 5 - Regulatory Matters (De

Note 5 - Regulatory Matters (Details Textual) - USD ($) $ in Millions

1 Months Ended

3 Months Ended

9 Months Ended

Jun. 30, 2023

Apr. 30, 2023

Apr. 20, 2023

Jan. 01, 2023

Nov. 18, 2022

Sep. 14, 2022

Dec. 23, 2021

Oct. 31, 2022

Feb. 28, 2021

Jun. 30, 2023

Jun. 30, 2022

Mar. 31, 2022

Jun. 30, 2023

Jun. 30, 2022

Apr. 28, 2023

Jan. 25, 2023

Sep. 30, 2022

Utilities Operating Expense, Gas and Petroleum Purchased

$ 169.8

$ 203.3

$ 1,175.5

$ 844.5

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

105.5

94.7

887.9

538.8

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

$ 78

72.2

Public Utilities, Requested Rate Increase (Decrease), Amount

$ 24.9

Public Utilities, Deferred Amount Under Order Authorizing Accounting Treatment

$ 42.8

Public Utilities, Approved Rate, Increase Decrease Annualized Revenue

$ 14.2

$ 7.7

Public Utilities, Disallowance From ACA Balance

$ 0.6

Public Utilities, Disallowance From ACA Balance Filed

$ 27.7

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

Public Utilities, Approved Rate Increase (Decrease), Amount

$ 19

Spire Alabama Inc [Member]

Utilities Operating Expense, Gas and Petroleum Purchased

$ 42.7

$ 41

$ 173.9

$ 138.6

Spire Alabama Inc [Member] | Alabama Public Service Commission [Member]

Annual Revenue Increase From Rates, Amount

$ 15

Spire Gulf [Member]

Public Utilities, Approved Rate, Increase Decrease Annualized Revenue

$ 1.8

$ 2.5

Public Utilities, Approved Return on Equity, Percentage

9.95%

Spire Mississippi [Member]

Public Utilities, Approved Rate Increase (Decrease), Amount

$ 1.3

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

20 years

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

15 years

15 years

Note 5 - Regulatory Matters - R

Note 5 - Regulatory Matters - Regulatory Assets and Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2023	Sep. 30, 2022	Jun. 30, 2022
Regulatory assets	$ 93.3	$ 355.4	$ 152
Regulatory Assets Noncurrent	1,421.2	1,112.4	1,205.6
Total Regulatory Assets	1,514.5	1,467.8	1,357.6
Regulatory Liability Current	5.5	3.7	3.2
Regulatory Liability Noncurrent	428.1	418.2	389
Total Regulatory Liabilities	433.6	421.9	392.2
Spire Missouri [Member]
Regulatory assets	35	288.1	89.9
Regulatory Assets Noncurrent	819.1	547.6	664.6
Total Regulatory Assets	854.1	835.7	754.5
Regulatory Liability Noncurrent	346.1	331.8	300.8
Total Regulatory Liabilities	346.1	331.8	300.8
Spire Alabama Inc [Member]
Regulatory assets	43.9	56.9	52.9
Regulatory Assets Noncurrent	576.7	538.2	514.1
Total Regulatory Assets	620.6	595.1	567
Regulatory Liability Noncurrent	20.8	23	24
Total Regulatory Liabilities	20.8	23	24
Unamortized Purchased Gas Adjustments Asset [Member]
Regulatory assets	66.2	322.2	123.4
Regulatory Assets Noncurrent	206.3	0	97.4
Regulatory Liability Current	0	53	0
Unamortized Purchased Gas Adjustments Asset [Member] | Spire Missouri [Member]
Regulatory assets	32.9	275.1	89.7
Regulatory Assets Noncurrent	206.3	0	97.4
Regulatory Liability Current	0	53	0
Unamortized Purchased Gas Adjustments Asset [Member] | Spire Alabama Inc [Member]
Regulatory assets	30.9	43.8	31.6
Other Regulatory Assets (Liabilities) [Member]
Regulatory assets	27.1	33.2	28.6
Regulatory Assets Noncurrent	152.3	129.2	124.3
Regulatory Liability Current	5.5	3.7	3.2
Regulatory Liability Noncurrent	23.3	14.4	14.6
Other Regulatory Assets (Liabilities) [Member] | Spire Missouri [Member]
Regulatory assets	2.1	13	0.2
Regulatory Assets Noncurrent	136.5	113.1	107.9
Regulatory Liability Current	17.8	7.3	7.7
Other Regulatory Assets (Liabilities) [Member] | Spire Alabama Inc [Member]
Regulatory assets	13	13.1	21.3
Regulatory Assets Noncurrent	1	1	1.1
Regulatory Liability Current	3.5	3.6	3.6
Pension and Other Postretirement Plans Costs [Member]
Regulatory assets	268.8	294.5	317.5
Regulatory Assets Noncurrent	165.3	172.6	185
Pension and Other Postretirement Plans Costs [Member] | Spire Missouri [Member]
Regulatory assets	193.4	222.9	238.5
Regulatory Assets Noncurrent	137.9	143.6	154.5
Pension and Other Postretirement Plans Costs [Member] | Spire Alabama Inc [Member]
Regulatory assets	71.1	66.5	73.8
Regulatory Assets Noncurrent	17.3	19.4	20.4
Deferred Income Tax Charge [Member]
Regulatory Assets Noncurrent	140.1	137.8	140.4
Deferred Income Tax Charge [Member] | Spire Missouri [Member]
Regulatory Assets Noncurrent	131.8	129.2	131.8
Deferred Income Tax Charge [Member] | Spire Alabama Inc [Member]
Regulatory Assets Noncurrent	2	2.2	2.2
Removal Costs [Member]
Regulatory Assets Noncurrent	597.9	493.7	471.9
Regulatory Liability Noncurrent	107.7	32.9	40.7
Removal Costs [Member] | Spire Missouri [Member]
Regulatory Assets Noncurrent	95.3	25.2	34.9
Regulatory Liability Noncurrent	72.3	0	7.3
Removal Costs [Member] | Spire Alabama Inc [Member]
Regulatory Assets Noncurrent	502.6	468.5	437
Renewable Energy Program [Member]
Regulatory Assets Noncurrent	55.8	57.2	54.1
Renewable Energy Program [Member] | Spire Missouri [Member]
Regulatory Assets Noncurrent	55.8	57.2	54.1
Estimated Deferred Taxes Due to Customers [Member]
Regulatory Liability Noncurrent	131.8	145.3	148.7
Estimated Deferred Taxes Due to Customers [Member] | Spire Missouri [Member]
Regulatory Liability Noncurrent	$ 118.1	$ 127.9	$ 131.3

Note 5 - Regulatory Matters -_2

Note 5 - Regulatory Matters - Regulatory Assets Not Earning a Return (Details) - USD ($) $ in Millions	Jun. 30, 2023	Sep. 30, 2022	Jun. 30, 2022
Regulatory assets not earning a return	$ 606.9	$ 686.3	$ 622.1
Spire Missouri [Member]
Regulatory assets not earning a return	600.7	679.9	615.7
Pension and Other Postretirement Plans Costs [Member]
Regulatory assets not earning a return	127.5	152.9	165.8
Pension and Other Postretirement Plans Costs [Member] | Spire Missouri [Member]
Regulatory assets not earning a return	127.5	152.9	165.8
Deferred Income Tax Charge [Member]
Regulatory assets not earning a return	138	135.6	138.2
Deferred Income Tax Charge [Member] | Spire Missouri [Member]
Regulatory assets not earning a return	131.8	129.2	131.8
Unamortized Purchased Gas Adjustments Asset [Member]
Regulatory assets not earning a return	239.2	275.1	187.2
Unamortized Purchased Gas Adjustments Asset [Member] | Spire Missouri [Member]
Regulatory assets not earning a return	239.2	275.1	187.2
Other Regulatory Assets (Liabilities) [Member]
Regulatory assets not earning a return	102.2	122.7	130.9
Other Regulatory Assets (Liabilities) [Member] | Spire Missouri [Member]
Regulatory assets not earning a return	$ 102.2	$ 122.7	$ 130.9

Note 6 - Financing (Details Tex

Note 6 - Financing (Details Textual) - USD ($) $ in Thousands		3 Months Ended
	Jan. 05, 2023	Mar. 31, 2023	Jun. 30, 2023	Mar. 07, 2023	Feb. 13, 2023	Oct. 13, 2022	Jul. 22, 2022
Interest Rate Swap [Member]
Derivative, Notional Amount, Settled		$ 325,000
Derivative, Gain (Loss) on Derivative, Net		$ 39,500
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			$ 375,200
Spire [Member] | Notes Due March 15 2033 [Member]
Debt Instrument, Interest Rate, Stated Percentage				5.80%
Long-Term Debt, Gross				$ 150,000
Spire Missouri [Member] | First Mortgage Bond Due 2033 [Member]
Debt Instrument, Interest Rate, Stated Percentage					4.80%
Long-Term Debt, Gross					$ 400,000
Spire Missouri [Member] | Unsecured Term Loan [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 1 [Member]
Line of Credit Facility, Covenant, Percentage of Total Capitalization			65%
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 6 - Financing - Short-term

Note 6 - Financing - Short-term Borrowings (Details) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2023	Sep. 30, 2022	Jun. 30, 2022
Highest borrowings outstanding	$ 1,482
Lowest borrowings outstanding	489
Weighted average borrowings	$ 868.1
Weighted average interest rate	4.80%
Borrowings outstanding	$ 557.6	$ 1,037.5	$ 709.2
Weighted average interest rate	5.50%	3.30%	2%
Spire Missouri [Member] | Term Loan [Member]
Highest borrowings outstanding	$ 250
Lowest borrowings outstanding	0
Weighted average borrowings	$ 89.4
Weighted average interest rate	5.50%
Borrowings outstanding	$ 0	$ 0	$ 0
Weighted average interest rate	0%
Spire Missouri [Member] | Spire Note [Member]
Highest borrowings outstanding	$ 656.9
Lowest borrowings outstanding	3.8
Weighted average borrowings	$ 308.9
Weighted average interest rate	4.60%
Borrowings outstanding	$ 228.1	$ 445.3	$ 285.4
Weighted average interest rate	5.50%	3.30%	2%
Spire Alabama Inc [Member] | Spire Note [Member]
Highest borrowings outstanding	$ 274
Lowest borrowings outstanding	76.7
Weighted average borrowings	$ 123.3
Weighted average interest rate	4.80%
Borrowings outstanding	$ 108.1	$ 260.9	$ 196.3
Weighted average interest rate	5.50%	3.30%	2%
Commercial Paper [Member] | Parent Company [Member]
Highest borrowings outstanding	$ 1,282
Lowest borrowings outstanding	354.4
Weighted average borrowings	$ 778.7
Weighted average interest rate	4.70%
Borrowings outstanding	$ 557.6	$ 1,037.5	$ 709.2
Weighted average interest rate	5.50%	3.30%	2%

Note 6 - Financing - Capitalize

Note 6 - Financing - Capitalized Interest Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Interest Paid Capitalized	$ 2.3	$ 1.1	$ 5.8	$ 3.2
Spire Missouri [Member]
Interest Paid Capitalized	1	0.2	2.1	0.3
Spire Alabama Inc [Member]
Interest Paid Capitalized	$ 0.5	$ 0.9	$ 1.8	$ 2.5

Note 7 - Fair Value of Financ_3

Note 7 - Fair Value of Financial Instruments - Estimated Fair Value of Financial Instruments Not Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	Jun. 30, 2023	Sep. 30, 2022	Jun. 30, 2022
Reported Value Measurement [Member]
Cash and cash equivalents	$ 5.3	$ 6.5	$ 16
Notes payable	557.6	1,037.5	709.2
Long-term debt, including current portion	3,959.9	3,239.7	3,239.1
Reported Value Measurement [Member] | Spire Missouri [Member]
Cash and cash equivalents			7
Long-term debt, including current portion	2,035.1	1,637.7	1,637.4
Notes payable – associated companies	228.1	445.3	285.4
Reported Value Measurement [Member] | Spire Alabama Inc [Member]
Cash and cash equivalents	0.5
Long-term debt, including current portion	745.8	571.5	571.4
Notes payable – associated companies	108.1	260.9	196.3
Estimate of Fair Value Measurement [Member]
Cash and cash equivalents	5.3	6.5	16
Notes payable	557.6	1,037.5	709.2
Long-term debt, including current portion	3,650.7	2,851.8	3,032.1
Estimate of Fair Value Measurement [Member] | Spire Missouri [Member]
Cash and cash equivalents			7
Long-term debt, including current portion	1,890.2	1,473.9	1,562.4
Notes payable – associated companies	228.1	445.3	285.4
Estimate of Fair Value Measurement [Member] | Spire Alabama Inc [Member]
Cash and cash equivalents	0.5	2.4	3.7
Long-term debt, including current portion	681.5	485	527.2
Notes payable – associated companies	108.1	260.9	196.3
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	5.3	6.5	16
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]
Cash and cash equivalents			7
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	0.5	2.4	3.7
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	557.6	1,037.5	709.2
Long-term debt, including current portion	3,650.7	2,851.8	3,032.1
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Spire Missouri [Member]
Cash and cash equivalents			0
Long-term debt, including current portion	1,890.2	1,473.9	1,562.4
Notes payable – associated companies	228.1	445.3	285.4
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Spire Alabama Inc [Member]
Cash and cash equivalents	0	0	0
Long-term debt, including current portion	681.5	485	527.2
Notes payable – associated companies	$ 108.1	$ 260.9	$ 196.3

Note 8 - Fair Value Measureme_3

Note 8 - Fair Value Measurements - Schedule of Derivative Assets and Liabilities, Including Receivables and Payables (Details) - Fair Value, Recurring [Member] - USD ($) $ in Millions	Jun. 30, 2023	Sep. 30, 2022	Jun. 30, 2022
Effects of netting, asset	$ (11.5)	$ (153.6)	$ (146.7)
Derivative Assets	110.4	164.6	149.3
Effects of netting, liability	(70.8)	(117)	(86.5)
Derivative Liabilities	34.7	61.5	113
Fair Value, Inputs, Level 1 [Member]
Derivative Asset Fair Value Gross Asset	99.1	254.6	243.3
Derivative Liability Fair Value Gross Liability	104.7	178.5	191.9
Fair Value, Inputs, Level 2 [Member]
Derivative Asset Fair Value Gross Asset	22.8	63.6	52.7
Derivative Liability Fair Value Gross Liability	0.8	0	7.6
Spire Missouri [Member]
Effects of netting, asset		(57.8)	(39.6)
Derivative Assets		19.1	20.3
Effects of netting, liability	(45.5)
Derivative Liabilities	0
Spire Missouri [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative Asset Fair Value Gross Asset		76.9	59.9
Derivative Liability Fair Value Gross Liability	45.5
Spire Missouri [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative Asset Fair Value Gross Asset		0	0
Derivative Liability Fair Value Gross Liability	0
U S Stock And Bond Mutual Funds [Member] | Gas Utility [Member]
Effects of netting, asset	0	0	0
Derivative Assets	21.4	19.1	20.3
U S Stock And Bond Mutual Funds [Member] | Other Segments [Member]
Effects of netting, asset	0	0	0
Derivative Assets	31.4	29.3	31.6
U S Stock And Bond Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Gas Utility [Member]
Derivative Asset Fair Value Gross Asset	21.4	19.1	20.3
U S Stock And Bond Mutual Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Other Segments [Member]
Derivative Asset Fair Value Gross Asset	31.4	29.3	31.6
U S Stock And Bond Mutual Funds [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, Inputs, Level 2 [Member] | Other Segments [Member]
Derivative Asset Fair Value Gross Asset	0	0	0
U S Stock And Bond Mutual Funds [Member] | Spire Missouri [Member]
Effects of netting, asset	0	0	0
Derivative Assets	21.4	19.1	20.3
U S Stock And Bond Mutual Funds [Member] | Spire Missouri [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative Asset Fair Value Gross Asset	21.4	19.1	20.3
U S Stock And Bond Mutual Funds [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] | Gas Utility [Member]
Effects of netting, asset		(57.8)	(39.6)
Derivative Assets	0	0	0
Effects of netting, liability	(44.8)	(30.7)	(12.8)
Derivative Liabilities		0	0
N Y M E X I C E Natural Gas Contracts [Member] | Gas Marketing [Member]
Effects of netting, asset	(10.5)	(91.8)	(94.2)
Derivative Assets	0	0	0
Effects of netting, liability	(24.3)	(82.3)	(60.8)
Derivative Liabilities	0	0	0
N Y M E X I C E Natural Gas Contracts [Member] | Fair Value, Inputs, Level 1 [Member] | Gas Utility [Member]
Derivative Asset Fair Value Gross Asset		57.8	39.6
Derivative Liability Fair Value Gross Liability	44.8	30.7	12.8
N Y M E X I C E Natural Gas Contracts [Member] | Fair Value, Inputs, Level 1 [Member] | Gas Marketing [Member]
Derivative Asset Fair Value Gross Asset	10.5	91.8	94.2
Derivative Liability Fair Value Gross Liability	24.3	82.3	60.8
N Y M E X I C E Natural Gas Contracts [Member] | Fair Value, Inputs, Level 2 [Member] | Gas Utility [Member]
Derivative Asset Fair Value Gross Asset		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, Inputs, Level 2 [Member] | Gas Marketing [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] | Spire Missouri [Member]
Effects of netting, asset		(57.8)	(39.6)
Derivative Assets		0	0
Effects of netting, liability	(44.8)	(30.7)	(12.8)
Derivative Liabilities	0	0	0
N Y M E X I C E Natural Gas Contracts [Member] | Spire Missouri [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative Asset Fair Value Gross Asset		57.8	39.6
Derivative Liability Fair Value Gross Liability	44.8	30.7	12.8
N Y M E X I C E Natural Gas Contracts [Member] | Spire Missouri [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative Asset Fair Value Gross Asset		0	0
Derivative Liability Fair Value Gross Liability	0	0	0
Gasoline And Heating Oil Contracts [Member] | Gas Utility [Member]
Derivative Assets	0
Effects of netting, liability	(0.7)
Gasoline And Heating Oil Contracts [Member] | Fair Value, Inputs, Level 1 [Member] | Gas Utility [Member]
Derivative Liability Fair Value Gross Liability	0.7
Gasoline And Heating Oil Contracts [Member] | Fair Value, Inputs, Level 2 [Member] | Gas Utility [Member]
Derivative Liability Fair Value Gross Liability	0
Gasoline And Heating Oil Contracts [Member] | Spire Missouri [Member]
Effects of netting, liability	(0.7)
Derivative Liabilities	0
Gasoline And Heating Oil Contracts [Member] | Spire Missouri [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative Liability Fair Value Gross Liability	0.7
Gasoline And Heating Oil Contracts [Member] | Spire Missouri [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative Liability Fair Value Gross Liability	0
Natural Gas Commodity Contracts [Member] | Gas Marketing [Member]
Effects of netting, asset	(1)	(4)	(5.3)
Derivative Assets	34.8	52.6	52.3
Effects of netting, liability	(1)	(4)	(5.3)
Derivative Liabilities	33.9	61.5	113
Natural Gas Commodity Contracts [Member] | Fair Value, Inputs, Level 1 [Member] | Gas Marketing [Member]
Derivative Asset Fair Value Gross Asset	35.8	56.6	57.6
Derivative Liability Fair Value Gross Liability	34.9	65.5	118.3
Natural Gas Commodity Contracts [Member] | Fair Value, Inputs, Level 2 [Member] | Gas Marketing [Member]
Derivative Asset Fair Value Gross Asset	0	0	0
Derivative Liability Fair Value Gross Liability	0	0	0
Interest Rate Swap [Member]
Effects of netting, asset			(7.6)
Derivative Assets			45.1
Interest Rate Swap [Member] | Other Segments [Member]
Effects of netting, asset	0	0
Derivative Assets	22.8	63.6
Effects of netting, liability	0		(7.6)
Derivative Liabilities	0.8		0
Interest Rate Swap [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative Asset Fair Value Gross Asset			0
Interest Rate Swap [Member] | Fair Value, Inputs, Level 1 [Member] | Other Segments [Member]
Derivative Asset Fair Value Gross Asset	0	0
Derivative Liability Fair Value Gross Liability	0		0
Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative Asset Fair Value Gross Asset			52.7
Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member] | Other Segments [Member]
Derivative Asset Fair Value Gross Asset	22.8	$ 63.6
Derivative Liability Fair Value Gross Liability	$ 0.8		$ 7.6

Note 9 - Pension Plans and Ot_3

Note 9 - Pension Plans and Other Postretirement Benefits (Details Textual) - USD ($) $ in Thousands				3 Months Ended				6 Months Ended		9 Months Ended		12 Months Ended
	Dec. 26, 2022	Dec. 23, 2021	Dec. 22, 2021	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Feb. 28, 2022	Sep. 30, 2021
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement							$ 0			$ 0
Regulatory Asset, Total				$ 1,514,500		$ 1,357,600				1,514,500	$ 1,357,600		$ 1,467,800
Regulatory Liability				433,600		392,200				433,600	392,200		421,900
Pension Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement				0		(17,800)				(8,600)	(29,500)
Spire Alabama Inc [Member]
Regulatory Asset, Total				620,600		567,000				620,600	567,000		595,100
Regulatory Liability				20,800		24,000				20,800	24,000		$ 23,000
Spire Alabama Inc [Member] | Pension Plan [Member]
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement					$ 27,500	3,600			$ 17,400
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement				0	$ (8,600)	$ (500)			$ (4,900)	(8,600)	$ (5,400)
Defined Benefit Plan, Plan Assets, Contributions by Employer				25,000
Spire Alabama Inc [Member] | Pension Plan One [Member]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate						13%		12.30%			13%				3.60%
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						11.10%	3.10%		3.10%		11.10%		5.65%	3.60%	3%
Defined Benefit Plan, Benefit Obligation, Settlement Losses Amortized Over Remaining Actuarial Life (Year)								12 years 7 months 6 days				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				854,100		$ 754,500				854,100	754,500		$ 835,700
Regulatory Liability				346,100		300,800				346,100	300,800		$ 331,800
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	$ 29,900	32,400	29,000
Spire Missouri [Member] | Pension and Other Postretirement Plans Costs [Member] | Missouri West [Member]
Regulatory Liabilities For Which No Return On Investment During Recovery Period Is Provided	800	$ 1,100	$ 3,300
Remaining Recovery Period of Regulatory Liabilities for which No Return on Investment During Recovery Period is Provided (Year)		8 years	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	6,900	$ 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]
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement						47,400			$ 21,600
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement				0		$ (17,300)			$ (6,800)	0	$ (24,100)
Anticipated Contributions to Pension Plans Qualified Trusts				$ 2,800
Spire Missouri [Member] | Pension Plan [Member] | Qualified Plan [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer										29,700
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%	4.55%	3.60%		3.60%		4.55%		5.70%	3.60%	3%
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] | Missouri West [Member]
Regulatory Liability	100
Spire Missouri [Member] | Other Postretirement Benefits Plan [Member] | Missouri East [Member]
Regulatory Liability	$ 900

Note 9 - Pension Plans and Ot_4

Note 9 - Pension Plans and Other Postretirement Benefits - Net Pension Costs (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended	9 Months Ended
	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
Pension Plan [Member]
Service cost – benefits earned during the period	$ 4.2		$ 4.8		$ 12.2	$ 15.6
Interest cost on projected benefit obligation	6.6		5.4		18.9	15.8
Expected return on plan assets	(6.4)		(7.7)		(18.5)	(24.1)
Amortization of prior service credit	(1.1)		(1.1)		(3.4)	(3.4)
Amortization of actuarial loss	1.5		2.5		4.7	9.8
Loss on lump-sum settlements	0		17.8		8.6	29.5
Subtotal	4.8		21.7		22.5	43.2
Regulatory adjustment	6.1		(6.9)		18.3	2.5
Net pension cost	10.9		14.8		40.8	45.7
Net postretirement benefit income	10.9		14.8		40.8	45.7
Pension Plan [Member] | Spire Missouri [Member]
Service cost – benefits earned during the period	2.8		3.5		8.5	11.2
Interest cost on projected benefit obligation	4.5		3.8		13.4	10.9
Expected return on plan assets	(4.5)		(5.7)		(13.5)	(17.6)
Amortization of prior service credit	(0.5)		(0.5)		(1.5)	(1.5)
Amortization of actuarial loss	1.5		2		4.6	7.6
Loss on lump-sum settlements	0		17.3	$ 6.8	0	24.1
Subtotal	3.8		20.4		11.5	34.7
Regulatory adjustment	3.4		(8.3)		19.6	1.3
Net pension cost	7.2		12.1		31.1	36
Net postretirement benefit income	7.2		12.1		31.1	36
Pension Plan [Member] | Spire Alabama Inc [Member]
Service cost – benefits earned during the period	1.3		1.1		3.2	3.8
Interest cost on projected benefit obligation	1.5		1.1		3.6	3.4
Expected return on plan assets	(1.1)		(1.2)		(2.7)	(4)
Amortization of prior service credit	(0.6)		(0.6)		(1.8)	(1.8)
Amortization of actuarial loss	0.1		0.5		0.4	2.2
Loss on lump-sum settlements	0	$ 8.6	0.5	$ 4.9	8.6	5.4
Subtotal	1.2		1.4		11.3	9
Regulatory adjustment	2.4		1.1		(2)	0.5
Net pension cost	3.6		2.5		9.3	9.5
Net postretirement benefit income	3.6		2.5		9.3	9.5
Other Postretirement Benefits Plan [Member]
Service cost – benefits earned during the period	1.2		1.9		3.6	5.8
Interest cost on projected benefit obligation	2		1.6		6.3	4.6
Expected return on plan assets	(4)		(4.3)		(11.8)	(12.8)
Amortization of prior service credit	0.1		0.3		0.2	0.8
Amortization of actuarial loss	(0.9)		(0.5)		(3)	(1.7)
Subtotal	(1.6)		(1)		(4.7)	(3.3)
Regulatory adjustment	(0.5)		(0.1)		(0.2)	3.2
Net pension cost	(2.1)		(1.1)		(4.9)	(0.1)
Net postretirement benefit income	(2.1)		(1.1)		(4.9)	(0.1)
Other Postretirement Benefits Plan [Member] | Spire Missouri [Member]
Service cost – benefits earned during the period	1		1.6		3	4.8
Interest cost on projected benefit obligation	1.6		1.2		4.9	3.4
Expected return on plan assets	(2.6)		(2.9)		(7.9)	(8.6)
Amortization of prior service credit	0.1		0.2		0.4	0.6
Amortization of actuarial loss	(0.8)		(0.5)		(2.4)	(1.5)
Subtotal	(0.7)		(0.4)		(2)	(1.3)
Regulatory adjustment	(0.2)		0.4		1.1	4.5
Net pension cost	(0.9)		0		(0.9)	3.2
Net postretirement benefit income	(0.9)		0		(0.9)	3.2
Other Postretirement Benefits Plan [Member] | Spire Alabama Inc [Member]
Service cost – benefits earned during the period	0.2		0.3		0.5	0.9
Interest cost on projected benefit obligation	0.4		0.4		1.3	1.1
Expected return on plan assets	(1.3)		(1.3)		(3.8)	(3.9)
Amortization of prior service credit	0		0.1		(0.2)	0.2
Amortization of actuarial loss	(0.1)		0		(0.4)	0
Subtotal	(0.8)		(0.5)		(2.6)	(1.7)
Regulatory adjustment	(0.5)		(0.5)		(1.4)	(1.4)
Net pension cost	(1.3)		(1)		(4)	(3.1)
Net postretirement benefit income	$ (1.3)		$ (1)		$ (4)	$ (3.1)

Note 10 - Information by Oper_3

Note 10 - Information by Operating Segment (Details Textual)	3 Months Ended
	Jun. 30, 2023
Number of Reportable Segments	3

Note 10 - Information by Oper_4

Note 10 - Information by Operating Segment - Segment Information by Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenues from external customers	$ 418.5	$ 448	$ 2,355.9	$ 1,884.3
Intersegment revenues	0	0	0	0
Operating Revenues	418.5	448	2,355.9	1,884.3
Natural gas	169.8	203.3	1,175.5	844.5
Operation and maintenance	125.5	102.3	389.7	331.9
Depreciation and amortization	64.3	60.4	189	176.2
Taxes, other than income taxes	46.9	44.1	179.2	153.3
Total Operating Expenses	406.5	410.1	1,933.4	1,505.9
Operating Income (Loss)	12	37.9	422.5	378.4
Net Economic (Loss) Earnings	(18.6)	4.1	265.7	247.7
Other Segments [Member]
Revenues from external customers	0.2	0.2	0.5	0.5
Intersegment revenues	4.1	3.9	11.9	11.6
Operating Revenues	4.3	4.1	12.4	12.1
Natural gas	0	0	0	0
Operation and maintenance	5.5	3.2	14.4	11.6
Depreciation and amortization	0.2	0.2	0.4	0.4
Taxes, other than income taxes	(0.1)	0.1	0	0.1
Total Operating Expenses	5.6	3.5	14.8	12.1
Operating Income (Loss)	(1.3)	0.6	(2.4)	0
Net Economic (Loss) Earnings	(7.4)	(4.8)	(25.4)	(18)
Operating Segments [Member]
Revenues from external customers			0
Intersegment revenues			38.7
Operating Revenues			38.7
Natural gas			26.8
Operation and maintenance			11.9
Depreciation and amortization			0
Taxes, other than income taxes			0
Total Operating Expenses			38.7
Operating Income (Loss)			0
Net Economic (Loss) Earnings			0
Operating Segments [Member] | Gas Utility [Member]
Revenues from external customers	387.5	377.4	2,174.9	1,698.3
Intersegment revenues	0.3	0	0.4	0
Operating Revenues	387.8	377.4	2,175.3	1,698.3
Natural gas	154.6	144.5	1,099.5	710.7
Operation and maintenance	111.7	95	350.9	306.5
Depreciation and amortization	61.7	58.1	181.6	169.2
Taxes, other than income taxes	45.9	43	176.2	150.3
Total Operating Expenses	373.9	340.6	1,808.2	1,336.7
Operating Income (Loss)	13.9	36.8	367.1	361.6
Net Economic (Loss) Earnings	(12.3)	4.2	234.5	240.6
Operating Segments [Member] | Gas Marketing [Member]
Revenues from external customers	23.1	64.1	157.8	171.4
Intersegment revenues	0	0	0	0
Operating Revenues	23.1	64.1	157.8	171.4
Natural gas	25.3	67.1	102.8	160.9
Operation and maintenance	4.2	3.2	16.2	9.1
Depreciation and amortization	0.3	0.3	1	1
Taxes, other than income taxes	0.4	0.4	1.1	0.8
Total Operating Expenses	30.2	71	121.1	171.8
Operating Income (Loss)	(7.1)	(6.9)	36.7	(0.4)
Net Economic (Loss) Earnings	(2.5)	0.4	45	15.3
Operating Segments [Member] | Midstream [Member]
Revenues from external customers	7.7	6.3	22.7	14.1
Intersegment revenues	9.7	8.3	26.4	27.2
Operating Revenues	17.4	14.6	49.1	41.3
Natural gas	0	0	0	0
Operation and maintenance	8.1	4.8	20.1	16.4
Depreciation and amortization	2.1	1.8	6	5.6
Taxes, other than income taxes	0.7	0.6	1.9	2.1
Total Operating Expenses	10.9	7.2	28	24.1
Operating Income (Loss)	6.5	7.4	21.1	17.2
Net Economic (Loss) Earnings	3.6	4.3	$ 11.6	9.8
Consolidation, Eliminations [Member]
Revenues from external customers	0	0		0
Intersegment revenues	(14.1)	(12.2)		(38.8)
Operating Revenues	(14.1)	(12.2)		(38.8)
Natural gas	(10.1)	(8.3)		(27.1)
Operation and maintenance	(4)	(3.9)		(11.7)
Depreciation and amortization	0	0		0
Taxes, other than income taxes	0	0		0
Total Operating Expenses	(14.1)	(12.2)		(38.8)
Operating Income (Loss)	0	0		0
Net Economic (Loss) Earnings	$ 0	$ 0		$ 0

Note 10 - Information by Oper_5

Note 10 - Information by Operating Segment - Net Economic Earnings to Net Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenues from external customers	$ 418.5	$ 448	$ 2,355.9	$ 1,884.3
Intersegment revenues	0	0	0	0
Intersegment revenues	0	0	0	0
Operating Revenues	418.5	448	2,355.9	1,884.3
Total Operating Revenues	(418.5)	(448)	(2,355.9)	(1,884.3)
Natural gas	169.8	203.3	1,175.5	844.5
Natural gas	(169.8)	(203.3)	(1,175.5)	(844.5)
Operation and maintenance	125.5	102.3	389.7	331.9
Operation and maintenance	(125.5)	(102.3)	(389.7)	(331.9)
Depreciation and amortization	64.3	60.4	189	176.2
Taxes, other than income taxes	46.9	44.1	179.2	153.3
Total Operating Expenses	406.5	410.1	1,933.4	1,505.9
Total Operating Expenses	(406.5)	(410.1)	(1,933.4)	(1,505.9)
Operating Income (Loss)	12	37.9	422.5	378.4
Net Economic (Loss) Earnings	(18.6)	4.1	265.7	247.7
Net Income	(21.6)	(1.4)	248.6	227.9
Fair value and timing adjustments	3.4	7.3	22.2	20.9
Acquisition activities	0.5	0	0.5	0
Income tax adjustments	(0.9)	(1.8)	(5.6)	(1.1)
Net Economic (Loss) Earnings	(18.6)	4.1	265.7	247.7
Other Segments [Member]
Revenues from external customers	0.2	0.2	0.5	0.5
Intersegment revenues	4.1	3.9	11.9	11.6
Intersegment revenues	(4.1)	(3.9)	(11.9)	(11.6)
Operating Revenues	4.3	4.1	12.4	12.1
Total Operating Revenues	(4.3)	(4.1)	(12.4)	(12.1)
Natural gas	0	0	0	0
Natural gas	0	0	0	0
Operation and maintenance	5.5	3.2	14.4	11.6
Operation and maintenance	(5.5)	(3.2)	(14.4)	(11.6)
Depreciation and amortization	0.2	0.2	0.4	0.4
Taxes, other than income taxes	(0.1)	0.1	0	0.1
Total Operating Expenses	5.6	3.5	14.8	12.1
Total Operating Expenses	(5.6)	(3.5)	(14.8)	(12.1)
Operating Income (Loss)	(1.3)	0.6	(2.4)	0
Net Economic (Loss) Earnings	(7.4)	(4.8)	(25.4)	(18)
Net Economic (Loss) Earnings	(7.4)	(4.8)	(25.4)	(18)
Operating Segments [Member]
Revenues from external customers			0
Intersegment revenues			38.7
Intersegment revenues			(38.7)
Operating Revenues			38.7
Total Operating Revenues			(38.7)
Natural gas			26.8
Natural gas			(26.8)
Operation and maintenance			11.9
Operation and maintenance			(11.9)
Depreciation and amortization			0
Taxes, other than income taxes			0
Total Operating Expenses			38.7
Total Operating Expenses			(38.7)
Operating Income (Loss)			0
Net Economic (Loss) Earnings			0
Net Economic (Loss) Earnings			0
Operating Segments [Member] | Gas Utility [Member]
Revenues from external customers	387.5	377.4	2,174.9	1,698.3
Intersegment revenues	0.3	0	0.4	0
Intersegment revenues	(0.3)	0	(0.4)	0
Operating Revenues	387.8	377.4	2,175.3	1,698.3
Total Operating Revenues	(387.8)	(377.4)	(2,175.3)	(1,698.3)
Natural gas	154.6	144.5	1,099.5	710.7
Natural gas	(154.6)	(144.5)	(1,099.5)	(710.7)
Operation and maintenance	111.7	95	350.9	306.5
Operation and maintenance	(111.7)	(95)	(350.9)	(306.5)
Depreciation and amortization	61.7	58.1	181.6	169.2
Taxes, other than income taxes	45.9	43	176.2	150.3
Total Operating Expenses	373.9	340.6	1,808.2	1,336.7
Total Operating Expenses	(373.9)	(340.6)	(1,808.2)	(1,336.7)
Operating Income (Loss)	13.9	36.8	367.1	361.6
Net Economic (Loss) Earnings	(12.3)	4.2	234.5	240.6
Net Economic (Loss) Earnings	(12.3)	4.2	234.5	240.6
Operating Segments [Member] | Gas Marketing [Member]
Revenues from external customers	23.1	64.1	157.8	171.4
Intersegment revenues	0	0	0	0
Intersegment revenues	0	0	0	0
Operating Revenues	23.1	64.1	157.8	171.4
Total Operating Revenues	(23.1)	(64.1)	(157.8)	(171.4)
Natural gas	25.3	67.1	102.8	160.9
Natural gas	(25.3)	(67.1)	(102.8)	(160.9)
Operation and maintenance	4.2	3.2	16.2	9.1
Operation and maintenance	(4.2)	(3.2)	(16.2)	(9.1)
Depreciation and amortization	0.3	0.3	1	1
Taxes, other than income taxes	0.4	0.4	1.1	0.8
Total Operating Expenses	30.2	71	121.1	171.8
Total Operating Expenses	(30.2)	(71)	(121.1)	(171.8)
Operating Income (Loss)	(7.1)	(6.9)	36.7	(0.4)
Net Economic (Loss) Earnings	(2.5)	0.4	45	15.3
Net Economic (Loss) Earnings	(2.5)	0.4	45	15.3
Operating Segments [Member] | Midstream [Member]
Revenues from external customers	7.7	6.3	22.7	14.1
Intersegment revenues	9.7	8.3	26.4	27.2
Intersegment revenues	(9.7)	(8.3)	(26.4)	(27.2)
Operating Revenues	17.4	14.6	49.1	41.3
Total Operating Revenues	(17.4)	(14.6)	(49.1)	(41.3)
Natural gas	0	0	0	0
Natural gas	0	0	0	0
Operation and maintenance	8.1	4.8	20.1	16.4
Operation and maintenance	(8.1)	(4.8)	(20.1)	(16.4)
Depreciation and amortization	2.1	1.8	6	5.6
Taxes, other than income taxes	0.7	0.6	1.9	2.1
Total Operating Expenses	10.9	7.2	28	24.1
Total Operating Expenses	(10.9)	(7.2)	(28)	(24.1)
Operating Income (Loss)	6.5	7.4	21.1	17.2
Net Economic (Loss) Earnings	3.6	4.3	11.6	9.8
Net Economic (Loss) Earnings	$ 3.6	$ 4.3	$ 11.6	$ 9.8

Note 10 - Information by Oper_6

Note 10 - Information by Operating Segment - Total Assets by Segment (Details) - USD ($) $ in Millions	Jun. 30, 2023	Sep. 30, 2022	Jun. 30, 2022
Total Assets	$ 10,037.5	$ 10,083.7	$ 9,783.9
Operating Segments [Member] | Gas Utility [Member]
Total Assets	8,283.2	8,042.8	7,854.7
Operating Segments [Member] | Gas Marketing [Member]
Total Assets	316.6	638.7	595.5
Operating Segments [Member] | Midstream [Member]
Total Assets	533.3	446	430.9
Operating Segments [Member] | Other Segments [Member]
Total Assets	2,134.1	2,449.2	2,222
Consolidation, Eliminations [Member]
Total Assets	$ (1,229.7)	$ (1,493)	$ (1,319.2)

Note 11 - Commitments and Con_2

Note 11 - Commitments and Contingencies (Details Textual) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
	May 31, 2023	Jun. 30, 2023
Long-Term Purchase Commitment, Amount		$ 1,780.5
Capital Committed to Contribute to Partnership		10
Remaining Unfunded Capital Commitment		7.2
MoGas Pipeline and Omega Pipeline [Member]
Business Combination, Price of Acquisition, Expected	$ 175
Spire Missouri [Member]
Long-Term Purchase Commitment, Amount		1,351.8
Spire Alabama Inc [Member]
Long-Term Purchase Commitment, Amount		$ 255.8

Item 5 - Other Information (Det

Item 5 - Other Information (Details Textual)	3 Months Ended
	Jun. 30, 2023
Issuer Rule 10b5-1, Arrangement Adopted [Flag]	False
Issuer Rule 10b5-1 Arrangement Terminated [Flag]	False