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Note 12 - Income Taxes - Significant Items Comprising the Net Deferred Tax Liability or Asset (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Reserves not currently deductible |  | $ 27.7 | $ 33.5
Pension and other postretirement benefits |  | 64.4 | 72.6
Goodwill |  | 0.0 | 0.0
Operating losses |  | 239.2 | 255.1
Regulatory amount due to customers, net |  | 30.4 | 34.5
Other |  | 35.8 | 24.9
Total deferred tax assets |  | 397.5 | 420.6
Relating to property |  | (788.0) | (740.0)
Regulatory pension and other postretirement benefits |  | (80.6) | (92.8)
Deferred gas costs |  | (67.0) | (75.8)
Other *** | [1] | (205.6) | (187.1)
Total deferred tax liabilities |  | (1,141.2) | (1,095.7)
Net deferred tax (liability) asset |  | (743.7) | (675.1)
Spire Missouri [Member] |  |  |
Reserves not currently deductible |  | 0.0 | 4.0
Pension and other postretirement benefits |  | 44.7 | 52.6
Goodwill |  | 0.0 | 0.0
Operating losses |  | 89.2 | 116.9
Regulatory amount due to customers, net |  | 27.6 | 30.7
Other |  | 10.5 | 0.0
Total deferred tax assets |  | 172.0 | 204.2
Relating to property |  | (507.7) | (489.3)
Regulatory pension and other postretirement benefits |  | (53.0) | (72.3)
Deferred gas costs |  | (64.1) | (74.0)
Other *** | [1] | (79.0) | (68.7)
Total deferred tax liabilities |  | (703.8) | (704.3)
Net deferred tax (liability) asset |  | (531.8) | (500.1)
Spire Alabama Inc [Member] |  |  |
Reserves not currently deductible |  | 3.9 | 7.4
Pension and other postretirement benefits |  | 17.0 | 0.0
Goodwill |  | 58.8 | 73.0
Operating losses |  | 159.8 | 140.3
Regulatory amount due to customers, net |  | 0.0 | 0.0
Other |  | 3.0 | 0.0
Total deferred tax assets |  | 242.5 | 220.7
Relating to property |  | (218.7) | (201.6)
Regulatory pension and other postretirement benefits |  | (25.9) | (1.6)
Deferred gas costs |  | 0.0 | 0.0
Other *** | [1] | (7.0) | (6.5)
Total deferred tax liabilities |  | (251.6) | (209.7)
Net deferred tax (liability) asset |  | (9.1) |
Net deferred tax (liability) asset |  | $ 0.0 | $ 11.0
[1] | For Spire, Other consists primarily of goodwill-related liabilities.

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