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Note 12 - Income Taxes - Significant Items Comprising the Net Deferred Tax Liability or Asset (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Sep. 30, 2021
--- | --- | ---
Reserves not currently deductible |  | $ 33.5 | $ 18.3
Pension and other postretirement benefits |  | 72.6 | 77.4
Goodwill |  | 0.0 | 0.0
Operating losses |  | 255.1 | 264.5
Regulatory amount due to customers, net |  | 34.5 | 33.2
Other |  | 24.9 | 32.4
Deferred tax assets |  | 420.6 | 425.8
Less: Valuation allowance |  | 0.0 | (0.5)
Total deferred tax assets |  | 420.6 | 425.3
Relating to property |  | (740.0) | (693.9)
Regulatory pension and other postretirement benefits |  | (92.8) | (95.6)
Deferred gas costs |  | (75.8) | (81.1)
Other** | [1] | (187.1) | (167.0)
Total deferred tax liabilities |  | (1,095.7) | (1,037.6)
Net deferred tax (liability) asset |  | (675.1) | (612.3)
Spire Missouri [Member] |  |  |
Reserves not currently deductible |  | 4.0 | 8.5
Pension and other postretirement benefits |  | 52.6 | 53.4
Goodwill |  | 0.0 | 0.0
Operating losses |  | 116.9 | 110.3
Regulatory amount due to customers, net |  | 30.7 | 29.4
Other |  | 0.0 | 0.0
Deferred tax assets |  | 204.2 | 201.6
Less: Valuation allowance |  | 0.0 | (0.4)
Total deferred tax assets |  | 204.2 | 201.2
Relating to property |  | (489.3) | (464.0)
Regulatory pension and other postretirement benefits |  | (72.3) | (71.2)
Deferred gas costs |  | (74.0) | (79.5)
Other** | [1] | (68.7) | (66.5)
Total deferred tax liabilities |  | (704.3) | (681.2)
Net deferred tax (liability) asset |  | (500.1) | (480.0)
Spire Alabama Inc [Member] |  |  |
Reserves not currently deductible |  | 7.4 | 6.6
Pension and other postretirement benefits |  | 0.0 | 0.0
Goodwill |  | 73.0 | 87.2
Operating losses |  | 140.3 | 130.3
Regulatory amount due to customers, net |  | 0.0 | 0.0
Other |  | 0.0 | 0.0
Deferred tax assets |  | 220.7 | 224.1
Less: Valuation allowance |  | 0.0 | 0.0
Total deferred tax assets |  | 220.7 | 224.1
Relating to property |  | (201.6) | (182.7)
Regulatory pension and other postretirement benefits |  | (1.6) | (1.6)
Deferred gas costs |  | 0.0 | 0.0
Other** | [1] | (6.5) | (5.6)
Total deferred tax liabilities |  | (209.7) | (189.9)
Net deferred tax (liability) asset |  | $ 11.0 | $ 34.2
[1] | For Spire, Other consists primarily of goodwill-related liabilities.

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