Note 8 - Fair Value Measurements - Schedule of Derivative Assets and Liabilities, Including Receivables and Payables (Details) - USD ($) $ in Millions	Mar. 31, 2023	Sep. 30, 2022	Mar. 31, 2022
Gasoline And Heating Oil Contracts [Member] \| Parent Company [Member] \| Term Loan [Member]
Derivative Asset Fair Value Gross Asset	$ 0.0
Gasoline And Heating Oil Contracts [Member] \| Commercial Paper [Member] \| Parent Company [Member]
Derivative Asset Fair Value Gross Asset	0.5
Spire Missouri [Member] \| Gasoline And Heating Oil Contracts [Member] \| Term Loan [Member]
Effects of netting, asset	(0.5)
Spire Missouri [Member] \| Gasoline And Heating Oil Contracts [Member] \| Spire Note [Member]
Derivative Assets	0.0
Fair Value, Recurring [Member]
Effects of netting, asset	(33.3)	$ (153.6)	$ (156.2)
Derivative Assets	104.3	164.6	105.5
Effects of netting, liability	(112.6)	(117.0)	(49.3)
Derivative Liabilities	33.3	61.5	105.2
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Derivative Asset Fair Value Gross Asset	137.6	318.2	261.7
Derivative Liability Fair Value Gross Liability	145.9	178.5	154.5
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0	0.0
Derivative Liability Fair Value Gross Liability	0.0	0.0	0.0
Fair Value, Recurring [Member] \| Spire Missouri [Member]
Effects of netting, asset	(0.1)	(57.8)	(58.9)
Derivative Assets	20.7	19.1	23.0
Effects of netting, liability	(63.2)
Derivative Liabilities	0.0
Fair Value, Recurring [Member] \| Spire Missouri [Member] \| Fair Value, Inputs, Level 1 [Member]
Derivative Asset Fair Value Gross Asset	20.8	76.9	81.9
Derivative Liability Fair Value Gross Liability	63.2
Fair Value, Recurring [Member] \| Spire Missouri [Member] \| Fair Value, Inputs, Level 2 [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0	0.0
Derivative Liability Fair Value Gross Liability	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	0.0
Derivative Assets	20.7	19.1	23.0
U S Stock And Bond Mutual Funds [Member] \| Fair Value, Recurring [Member] \| Other Segments [Member]
Effects of netting, asset	0.0	0.0	0.0
Derivative Assets	29.2	29.3	24.1
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	20.7	19.1	23.0
U S Stock And Bond Mutual Funds [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Other Segments [Member]
Derivative Asset Fair Value Gross Asset	29.2	29.3	24.1
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	0.0
U S Stock And Bond Mutual Funds [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Other Segments [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0	0.0
U S Stock And Bond Mutual Funds [Member] \| Fair Value, Recurring [Member] \| Spire Missouri [Member]
Effects of netting, asset	0.0	0.0	0.0
Derivative Assets	20.7	19.1	23.0
U S Stock And Bond Mutual Funds [Member] \| Fair Value, Recurring [Member] \| Spire Missouri [Member] \| Fair Value, Inputs, Level 1 [Member]
Derivative Asset Fair Value Gross Asset	20.7	19.1	23.0
U S Stock And Bond Mutual Funds [Member] \| Fair Value, Recurring [Member] \| Spire Missouri [Member] \| Fair Value, Inputs, Level 2 [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0	0.0
N Y M E X I C E Natural Gas Contracts [Member] \| Fair Value, Recurring [Member] \| Gas Utility [Member]
Effects of netting, asset	(0.1)	(57.8)	(58.9)
Derivative Assets	0.0	0.0	0.0
Effects of netting, liability	(62.7)	(30.7)	(40.4)
Derivative Liabilities	0.0	0.0	0.0
N Y M E X I C E Natural Gas Contracts [Member] \| Fair Value, Recurring [Member] \| Gas Marketing [Member]
Effects of netting, asset	(31.9)	(91.8)	(88.4)
Derivative Assets	0.0	0.0	7.7
Effects of netting, liability	(48.1)	(82.3)
Derivative Liabilities	0.0	0.0
N Y M E X I C E Natural Gas Contracts [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Gas Utility [Member]
Derivative Asset Fair Value Gross Asset	0.1	57.8	58.9
Derivative Liability Fair Value Gross Liability	62.7	30.7	40.4
N Y M E X I C E Natural Gas Contracts [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Gas Marketing [Member]
Derivative Asset Fair Value Gross Asset	31.9	91.8	96.1
Derivative Liability Fair Value Gross Liability	48.1	82.3
N Y M E X I C E Natural Gas Contracts [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Gas Utility [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0	0.0
Derivative Liability Fair Value Gross Liability	0.0	0.0	0.0
N Y M E X I C E Natural Gas Contracts [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Gas Marketing [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0	0.0
Derivative Liability Fair Value Gross Liability	0.0	0.0
N Y M E X I C E Natural Gas Contracts [Member] \| Fair Value, Recurring [Member] \| Spire Missouri [Member]
Effects of netting, asset	(0.1)	(57.8)	(58.9)
Derivative Assets	0.0	0.0	0.0
Effects of netting, liability	(62.7)	(30.7)
Derivative Liabilities	0.0	0.0
N Y M E X I C E Natural Gas Contracts [Member] \| Fair Value, Recurring [Member] \| Spire Missouri [Member] \| Fair Value, Inputs, Level 1 [Member]
Derivative Asset Fair Value Gross Asset	0.1	57.8	58.9
Derivative Liability Fair Value Gross Liability	62.7	30.7
N Y M E X I C E Natural Gas Contracts [Member] \| Fair Value, Recurring [Member] \| Spire Missouri [Member] \| Fair Value, Inputs, Level 2 [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0	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	(1.3)	(4.0)	(1.0)
Derivative Assets	37.9	52.6	29.8
Effects of netting, liability	(1.3)	(4.0)	(1.0)
Derivative Liabilities	31.1	61.5	105.2
Natural Gas Commodity Contracts [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Gas Marketing [Member]
Derivative Asset Fair Value Gross Asset	39.2	56.6	30.8
Derivative Liability Fair Value Gross Liability	32.4	65.5	106.2
Natural Gas Commodity Contracts [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Gas Marketing [Member]
Derivative Asset Fair Value Gross Asset	0.0	0.0	0.0
Derivative Liability Fair Value Gross Liability	0.0	0.0	0.0
Gasoline And Heating Oil Contracts [Member] \| Fair Value, Recurring [Member] \| Spire Missouri [Member]
Effects of netting, asset	(0.5)
Derivative Assets	0.0
Gasoline And Heating Oil Contracts [Member] \| Fair Value, Recurring [Member] \| Spire Missouri [Member] \| Fair Value, Inputs, Level 1 [Member]
Derivative Asset Fair Value Gross Asset	0.5
Gasoline And Heating Oil Contracts [Member] \| Fair Value, Recurring [Member] \| Spire Missouri [Member] \| Fair Value, Inputs, Level 2 [Member]
Derivative Asset Fair Value Gross Asset	0.0
Interest Rate Swap [Member] \| Fair Value, Recurring [Member]
Effects of netting, asset			(7.9)
Derivative Assets			20.9
Interest Rate Swap [Member] \| Fair Value, Recurring [Member] \| Other Segments [Member]
Effects of netting, asset	0.0	0.0
Derivative Assets	16.5	63.6
Effects of netting, liability	0.0		(7.9)
Derivative Liabilities	2.2		0.0
Interest Rate Swap [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Derivative Asset Fair Value Gross Asset			28.8
Interest Rate Swap [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Other Segments [Member]
Derivative Asset Fair Value Gross Asset	16.5	63.6
Derivative Liability Fair Value Gross Liability	2.2		7.9
Interest Rate Swap [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Derivative Asset Fair Value Gross Asset			0.0
Interest Rate Swap [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Other Segments [Member]
Derivative Asset Fair Value Gross Asset	0.0	$ 0.0
Derivative Liability Fair Value Gross Liability	$ 0.0		$ 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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