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Note 17 - Leases (Tables) | 12 Months Ended
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Sep. 30, 2023
Notes Tables |
Schedule of Operating Lease Cost, Cash Flow and Non Cash Information [Table Text Block] |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2023 |  |  | 2022 |  |  | 2021 |  |  | 2023 |  |  | 2022 |  |  | 2021 |  |  | 2023 |  |  | 2022 |  |  | 2021 |
Operating lease cost, including amounts capitalized |  | $ | 7.3 |  |  | $ | 7.4 |  |  | $ | 7.2 |  |  | $ | 0.5 |  |  | $ | 0.5 |  |  | $ | 0.4 |  |  | $ | 2.0 |  |  | $ | 2.1 |  |  | $ | 2.1 |
Cash flow and noncash information about operating leases: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating cash flows representing cash paid for amounts included in the measurement of lease liabilities |  |  | 7.3 |  |  |  | 7.3 |  |  |  | 7.2 |  |  |  | 0.5 |  |  |  | 0.5 |  |  |  | 0.4 |  |  |  | 2.1 |  |  |  | 2.1 |  |  |  | 2.1 |
Right-of-use assets obtained in exchange for lease liabilities |  |  | 0.8 |  |  |  | 24.6 |  |  |  | — |  |  |  | 0.8 |  |  |  | 1.1 |  |  |  | — |  |  |  | — |  |  |  | 23.5 |  |  |  | — |
Schedule of Balance Sheet and Weighted Average Information About Operating Leases [Table Text Block] |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Right-of-use assets |  | $ | 70.6 |  |  | $ | 73.7 |  |  | $ | 2.1 |  |  | $ | 1.7 |  |  | $ | 19.2 |  |  | $ | 20.2 |
Lease liabilities, current |  |  | 6.8 |  |  |  | 6.5 |  |  |  | 0.5 |  |  |  | 0.4 |  |  |  | 1.9 |  |  |  | 1.9 |
Lease liabilities, noncurrent |  |  | 70.2 |  |  |  | 73.7 |  |  |  | 1.8 |  |  |  | 1.5 |  |  |  | 23.5 |  |  |  | 24.6 |
Weighted-average remaining lease term (in years) |  |  | 14.1 |  |  |  | 15.0 |  |  |  | 5.6 |  |  |  | 5.1 |  |  |  | 13.3 |  |  |  | 14.3 |
Weighted-average discount rate |  |  | 4.2 | % |  |  | 4.1 | % |  |  | 3.3 | % |  |  | 2.2 | % |  |  | 3.7 | % |  |  | 3.7 | %
Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
2024 |  | $ | 6.9 |  |  | $ | 0.5 |  |  | $ | 1.9 |
2025 |  |  | 7.5 |  |  |  | 0.6 |  |  |  | 2.2 |
2026 |  |  | 7.5 |  |  |  | 0.4 |  |  |  | 2.2 |
2027 |  |  | 7.4 |  |  |  | 0.3 |  |  |  | 2.3 |
2028 |  |  | 7.4 |  |  |  | 0.3 |  |  |  | 2.3 |
Thereafter |  |  | 65.9 |  |  |  | 0.5 |  |  |  | 21.7 |
Total undiscounted lease payments |  |  | 102.6 |  |  |  | 2.6 |  |  |  | 32.6 |
Less present value discount |  |  | (25.6 | ) |  |  | (0.3 | ) |  |  | (7.2 | )
Total current and noncurrent lease liabilities |  | $ | 77.0 |  |  | $ | 2.3 |  |  | $ | 25.4 |

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