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Income Taxes (Tables)

12 Months Ended

Sep. 30, 2025

Income Tax Disclosure [Abstract]

Provision for Income Taxes

The provision for income taxes during the fiscal years ended September 30, 2025, 2024, and 2023 was as follows:

		Spire												Spire Missouri												Spire Alabama
		2025				2024				2023				2025				2024				2023				2025				2024				2023
Federal:
Current		$	1.7			$	0.2			$	0.7			$	—			$	—			$	—			$	—			$	—			$	—
Deferred			46.3				46.1				30.4				12.4				13.5				10.1				22.9				21.7				15.8
Investment tax credits			(0.2	)			(0.2	)			(0.2	)			(0.2	)			(0.2	)			(0.2	)			—				—				—
State and local:
Current			0.7				1.5				1.2				0.2				0.9				—				—				—				—
Deferred			11.2				11.1				6.7				1.4				1.5				1.7				5.5				5.2				4.5
Total income tax expense		$	59.7			$	58.7			$	38.8			$	13.8			$	15.7			$	11.6			$	28.4			$	26.9			$	20.3

Effective Income Tax Rate

The effective income tax rate varied from the federal statutory income tax rate for each year due to the following:

		Spire												Spire Missouri												Spire Alabama
		2025				2024				2023				2025				2024				2023				2025				2024				2023
Federal income tax statutory rate			21.0	%			21.0	%			21.0	%			21.0	%			21.0	%			21.0	%			21.0	%			21.0	%			21.0	%
State and local income taxes, net of federal    income tax benefits			3.7				3.7				3.7				2.6				2.6				2.6				4.1				4.1				4.1
Certain expenses capitalized on books and    deducted on tax return			(1.1	)			(1.2	)			(1.4	)			(2.5	)			(2.7	)			(2.7	)			—				—				—
Tax credits *			(0.8	)			(0.9	)			(3.3	)			(1.1	)			(1.1	)			(4.2	)			(0.3	)			(0.3	)			(1.9	)
Amortization of excess deferred taxes			(3.1	)			(3.3	)			(5.1	)			(7.0	)			(7.4	)			(7.7	)			0.1				0.2				0.2
Taxes related to prior years			(1.3	)			—				—				(2.9	)			—				—				—				—				—
Other items – net			(0.4	)			(0.3	)			0.2				(0.4	)			(0.7	)			—				0.1				0.1				0.1
Effective income tax rate			18.0	%			19.0	%			15.1	%			9.7	%			11.7	%			9.0	%			25.0	%			25.1	%			23.5	%

* In 2023, the Company completed a research and development study which encompassed fiscal years 2014 to 2022.

Significant Items Comprising the Net Deferred Tax Liability or Asset

The significant items comprising the net deferred tax liability or asset as of September 30 were as follows:

		Spire								Spire Missouri								Spire Alabama
		2025				2024				2025				2024				2025				2024
Deferred tax assets:
Operating losses		$	150.1			$	182.2			$	1.5			$	24.7			$	146.1			$	153.0
Goodwill			—				—				—				—				29.7				44.4
Pension and other postretirement benefits			52.6				58.6				36.0				39.3				14.8				17.1
Regulatory amount due to customers, net			23.9				27.1				21.4				24.5				—				2.3
Reserves not currently deductible			24.9				0.5				—				—				3.4				2.9
Other			73.5				43.3				16.7				12.3				6.0				2.1
Total deferred tax assets			325.0				311.7				75.6				100.8				200.0				221.8
Deferred tax liabilities:
Relating to property			(912.3	)			(842.2	)			(572.6	)			(531.2	)			(238.1	)			(230.0	)
Regulatory pension and other postretirement    benefits			(54.4	)			(60.8	)			(27.2	)			(33.8	)			(24.0	)			(25.6	)
Deferred gas costs			(10.7	)			(19.9	)			(8.2	)			(17.7	)			—				—
Other ***			(235.0	)			(197.2	)			(66.3	)			(85.7	)			(2.0	)			(2.1	)
Total deferred tax liabilities			(1,212.4	)			(1,120.1	)			(674.3	)			(668.4	)			(264.1	)			(257.7	)
Net deferred tax (liability) asset		$	(887.4	)		$	(808.4	)		$	(598.7	)		$	(567.6	)		$	(64.1	)		$	(35.9	)

*** For Spire, Other consists primarily of goodwill-related liabilities.

Summary of Federal and State Loss and Contribution and Tax Credit Carryforwards

		Spire				Spire Missouri				Spire Alabama
Federal and state loss carryforwards		$	646.1			$	9.7			$	583.3
Tax credit carryforwards			18.9				8.8				2.7

Schedule of Unrecognized Tax Benefits Roll Forward

		Spire												Spire Missouri												Spire Alabama
		2025				2024				2023				2025				2024				2023				2025				2024				2023
Unrecognized tax benefits, beginning of year		$	26.3			$	23.8			$	19.6			$	25.3			$	22.9			$	19.3			$	0.3			$	0.3			$	—
Increases related to tax positions taken in    current year			0.6				2.6				4.2				0.2				2.4				3.6				—				—				0.3
Decreases related to tax positions taken in prior years			(24.2	)			—				—				(24.2	)			—				—				—				—				—
Reductions due to lapse of applicable statute    of limitations			—				(0.1	)			—				—				—				—				—				—				—
Unrecognized tax benefits, end of year		$	2.7			$	26.3			$	23.8			$	1.3			$	25.3			$	22.9			$	0.3			$	0.3			$	0.3

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