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Leases (Tables) | 12 Months Ended
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Sep. 30, 2025
Leases [Abstract] |
Schedule of Operating Lease Cost, Cash Flow and Non Cash Information | Operating lease cost, cash flow and noncash information are shown in the following table.
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2025 |  |  | 2024 |  |  | 2023 |  |  | 2025 |  |  | 2024 |  |  | 2023 |  |  | 2025 |  |  | 2024 |  |  | 2023 |
Operating lease cost, including amounts capitalized |  | $ | 7.1 |  |  | $ | 7.3 |  |  | $ | 7.3 |  |  | $ | 0.5 |  |  | $ | 0.5 |  |  | $ | 0.5 |  |  | $ | 2.0 |  |  | $ | 2.0 |  |  | $ | 2.0 |
Operating cash flows representing cash paid for amounts included in the measurement of lease liabilities |  |  | 7.3 |  |  |  | 7.4 |  |  |  | 7.3 |  |  |  | 0.5 |  |  |  | 0.5 |  |  |  | 0.5 |  |  |  | 2.2 |  |  |  | 2.1 |  |  |  | 2.1 |
Right-of-use assets obtained in exchange for lease liabilities |  |  | — |  |  |  | — |  |  |  | 0.8 |  |  |  | — |  |  |  | — |  |  |  | 0.8 |  |  |  | — |  |  |  | — |  |  |  | — |
Schedule of Balance Sheet and Weighted Average Information About Operating Leases | The following table shows year-end balance sheet and weighted-average information about operating leases.
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Right-of-use assets |  | $ | 59.2 |  |  | $ | 63.1 |  |  | $ | 1.6 |  |  | $ | 1.7 |  |  | $ | 17.0 |  |  | $ | 18.1 |
Lease liabilities, current |  |  | 6.1 |  |  |  | 6.6 |  |  |  | 0.5 |  |  |  | 0.5 |  |  |  | 2.0 |  |  |  | 1.9 |
Lease liabilities, noncurrent |  |  | 59.1 |  |  |  | 62.7 |  |  |  | 1.2 |  |  |  | 1.3 |  |  |  | 20.9 |  |  |  | 22.3 |
Weighted-average remaining lease term (in years) |  |  | 12.6 |  |  |  | 13.5 |  |  |  | 4.8 |  |  |  | 5.1 |  |  |  | 11.3 |  |  |  | 12.3 |
Weighted-average discount rate |  |  | 4.2 | % |  |  | 4.2 | % |  |  | 3.8 | % |  |  | 3.4 | % |  |  | 3.7 | % |  |  | 3.7 | %
Lessee, Operating Lease, Liability, to be Paid, Maturity | Following is a maturity analysis by fiscal year for operating lease liabilities as of September 30, 2025.
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
2026 |  | $ | 6.3 |  |  | $ | 0.5 |  |  | $ | 2.0 |
2027 |  |  | 6.7 |  |  |  | 0.4 |  |  |  | 2.3 |
2028 |  |  | 6.8 |  |  |  | 0.3 |  |  |  | 2.3 |
2029 |  |  | 6.7 |  |  |  | 0.3 |  |  |  | 2.4 |
2030 |  |  | 6.7 |  |  |  | 0.2 |  |  |  | 2.4 |
Thereafter |  |  | 51.3 |  |  |  | 0.2 |  |  |  | 16.9 |
Total undiscounted lease payments |  |  | 84.5 |  |  |  | 1.9 |  |  |  | 28.3 |
Less present value discount |  |  | (19.3 | ) |  |  | (0.2 | ) |  |  | (5.4 | )
Total current and noncurrent lease liabilities |  | $ | 65.2 |  |  | $ | 1.7 |  |  | $ | 22.9 |

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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-6 + Details
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