Note 9 - Fair Value Measurements - Schedule of Derivative Assets and Liabilities, Including Receivables and Payables (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Derivative Assets	$ 43.3	$ 77.3
Derivative Liabilities	32.3	30.8
Fair Value, Recurring [Member]
Effects of netting, asset	(13.9)	(20.1)
Derivative Assets	113.3	135.3
Effects of netting, liability	(25.0)	(69.4)
Derivative Liabilities	32.3	30.8
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Derivative Asset Fair Value Gross Asset	80.4	74.4
Derivative Liability Fair Value Gross Liability	31.3	72.6
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Derivative Asset Fair Value Gross Asset	46.8	81.0
Derivative Liability Fair Value Gross Liability	26.0	27.6
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0
Derivative Liability Fair Value Gross Liability	0.0	0.0
U S Stock And Bond Mutual Funds [Member] \| Fair Value, Recurring [Member] \| Gas Utility [Member]
Effects of netting, asset	0.0	0.0
Derivative Assets	24.3	20.4
U S Stock And Bond Mutual Funds [Member] \| Fair Value, Recurring [Member] \| Other Operating Segment [Member]
Effects of netting, asset	0.0	0.0
Derivative Assets	17.9	7.5
U S Stock And Bond Mutual Funds [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Gas Utility [Member]
Derivative Asset Fair Value Gross Asset	24.3	20.4
U S Stock And Bond Mutual Funds [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Other Operating Segment [Member]
Derivative Asset Fair Value Gross Asset	17.9	7.5
U S Stock And Bond Mutual Funds [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Gas Utility [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0
U S Stock And Bond Mutual Funds [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Other Operating Segment [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0
U S Stock And Bond Mutual Funds [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Gas Utility [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0
U S Stock And Bond Mutual Funds [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Other Operating Segment [Member]
Derivative Asset Fair Value Gross Asset		0.0
N Y M E X And I C E Natural Gas Contracts [Member] \| Fair Value, Recurring [Member] \| Gas Utility [Member]
Effects of netting, asset	(3.4)	(6.3)
Derivative Assets	0.0	0.0
Effects of netting, liability	(3.8)	(44.0)
Derivative Liabilities	9.8	6.8
N Y M E X And I C E Natural Gas Contracts [Member] \| Fair Value, Recurring [Member] \| Gas Marketing [Member]
Effects of netting, asset	(7.0)	(10.1)
Derivative Assets	0.0	0.0
Effects of netting, liability	(17.7)	(21.8)
Derivative Liabilities	0.0	0.0
N Y M E X And I C E Natural Gas Contracts [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Gas Utility [Member]
Derivative Asset Fair Value Gross Asset	3.4	6.3
Derivative Liability Fair Value Gross Liability	13.6	50.8
N Y M E X And I C E Natural Gas Contracts [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Gas Marketing [Member]
Derivative Asset Fair Value Gross Asset	7.0	10.1
Derivative Liability Fair Value Gross Liability	17.7	21.8
N Y M E X And I C E Natural Gas Contracts [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Gas Utility [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0
Derivative Liability Fair Value Gross Liability	0.0	0.0
N Y M E X And I C E Natural Gas Contracts [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Gas Marketing [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0
Derivative Liability Fair Value Gross Liability	0.0	0.0
N Y M E X And I C E Natural Gas Contracts [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Gas Utility [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0
Derivative Liability Fair Value Gross Liability	0.0	0.0
N Y M E X And I C E Natural Gas Contracts [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Gas Marketing [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0
Derivative Liability Fair Value Gross Liability	0.0	0.0
Natural Gas Commodity Contracts [Member] \| Fair Value, Recurring [Member] \| Gas Marketing [Member]
Effects of netting, asset	(3.5)	(3.6)
Derivative Assets	42.5	33.1
Effects of netting, liability	(3.5)	(3.6)
Derivative Liabilities	21.0	24.0
Natural Gas Commodity Contracts [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Gas Marketing [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0
Derivative Liability Fair Value Gross Liability	0.0	0.0
Natural Gas Commodity Contracts [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Gas Marketing [Member]
Derivative Asset Fair Value Gross Asset	46.0	36.7
Derivative Liability Fair Value Gross Liability	24.5	27.6
Natural Gas Commodity Contracts [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Gas Marketing [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0
Derivative Liability Fair Value Gross Liability	0.0	0.0
U.S. Bonds [Member] \| Fair Value, Recurring [Member] \| Other Operating Segment [Member]
Derivative Asset Fair Value Gross Asset
Effects of netting, asset	0.0
Derivative Assets	21.9	28.7
U.S. Bonds [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Other Operating Segment [Member]
Derivative Asset Fair Value Gross Asset	21.9	28.7
U.S. Bonds [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Other Operating Segment [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0
U.S. Bonds [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Other Operating Segment [Member]
Derivative Asset Fair Value Gross Asset		0.0
Gasoline And Heating Oil Contracts [Member] \| Fair Value, Recurring [Member] \| Gas Utility [Member]
Effects of netting, asset		(0.1)
Derivative Assets		0.0
Gasoline And Heating Oil Contracts [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Gas Utility [Member]
Derivative Asset Fair Value Gross Asset		0.0
Gasoline And Heating Oil Contracts [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Gas Utility [Member]
Derivative Asset Fair Value Gross Asset		0.1
Gasoline And Heating Oil Contracts [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Gas Utility [Member]
Derivative Asset Fair Value Gross Asset		0.0
Global Bonds [Member] \| Fair Value, Recurring [Member] \| Other Operating Segment [Member]
Derivative Asset Fair Value Gross Asset	0.0
Effects of netting, asset		0.0
Derivative Assets	5.9	1.4
Global Bonds [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Other Operating Segment [Member]
Derivative Asset Fair Value Gross Asset	5.9	1.4
Global Bonds [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Other Operating Segment [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0
Global Bonds [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Other Operating Segment [Member]
Derivative Asset Fair Value Gross Asset		0.0
Effects of netting, asset	0.0
Interest Rate Swap [Member] \| Fair Value, Recurring [Member] \| Other Operating Segment [Member]
Effects of netting, asset	0.0	0.0
Derivative Assets	0.8	44.2
Derivative Liabilities	1.5
Interest Rate Swap [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Other Operating Segment [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0
Derivative Liability Fair Value Gross Liability	0.0
Interest Rate Swap [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Other Operating Segment [Member]
Derivative Asset Fair Value Gross Asset	0.8	44.2
Derivative Liability Fair Value Gross Liability	1.5
Interest Rate Swap [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Other Operating Segment [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0
Derivative Liability Fair Value Gross Liability	0.0
Spire Missouri [Member]
Derivative Assets	0.0	0.0
Derivative Liabilities	9.8	6.8
Spire Missouri [Member] \| Fair Value, Recurring [Member]
Effects of netting, asset	(3.4)	(6.4)
Derivative Assets	24.3	20.4
Spire Missouri [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Derivative Asset Fair Value Gross Asset	27.7	26.7
Spire Missouri [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.1
Spire Missouri [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0
Spire Missouri [Member] \| U S Stock And Bond Mutual Funds [Member] \| Fair Value, Recurring [Member]
Effects of netting, asset	0.0	0.0
Derivative Assets	24.3	20.4
Spire Missouri [Member] \| U S Stock And Bond Mutual Funds [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Derivative Asset Fair Value Gross Asset	24.3	20.4
Spire Missouri [Member] \| U S Stock And Bond Mutual Funds [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0
Spire Missouri [Member] \| U S Stock And Bond Mutual Funds [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0
Spire Missouri [Member] \| N Y M E X I C E Natural Gas Contracts [Member] \| Fair Value, Recurring [Member]
Effects of netting, asset	(3.4)	(6.3)
Derivative Assets	0.0	0.0
Effects of netting, liability	(3.8)	(44.0)
Derivative Liabilities	9.8	6.8
Spire Missouri [Member] \| N Y M E X I C E Natural Gas Contracts [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Derivative Asset Fair Value Gross Asset	3.4	6.3
Derivative Liability Fair Value Gross Liability	13.6	50.8
Spire Missouri [Member] \| N Y M E X I C E Natural Gas Contracts [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0
Derivative Liability Fair Value Gross Liability	0.0	0.0
Spire Missouri [Member] \| N Y M E X I C E Natural Gas Contracts [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0
Derivative Liability Fair Value Gross Liability	$ 0.0	0.0
Spire Missouri [Member] \| Gasoline And Heating Oil Contracts [Member] \| Fair Value, Recurring [Member]
Effects of netting, asset		(0.1)
Derivative Assets		0.0
Spire Missouri [Member] \| Gasoline And Heating Oil Contracts [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Derivative Asset Fair Value Gross Asset		0.0
Spire Missouri [Member] \| Gasoline And Heating Oil Contracts [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Derivative Asset Fair Value Gross Asset		0.1
Spire Missouri [Member] \| Gasoline And Heating Oil Contracts [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Derivative Asset Fair Value Gross Asset		$ 0.0

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and elected not to be offset.

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Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, and obligation to return cash collateral under master netting arrangements.

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