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Note 17 - Leases (Tables) | 12 Months Ended
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Sep. 30, 2022
Notes Tables |
Schedule of Operating Lease Cost, Cash Flow and Non Cash Information [Table Text Block] |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2022 |  |  | 2021 |  |  | 2020 |  |  | 2022 |  |  | 2021 |  |  | 2020 |  |  | 2022 |  |  | 2021 |  |  | 2020 |
Operating lease cost, including amounts capitalized |  | $ | 7.4 |  |  | $ | 7.2 |  |  | $ | 8.7 |  |  | $ | 0.5 |  |  | $ | 0.4 |  |  | $ | 0.5 |  |  | $ | 2.1 |  |  | $ | 2.1 |  |  | $ | 3.5 |
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 |  |  |  | 7.2 |  |  |  | 8.5 |  |  |  | 0.5 |  |  |  | 0.4 |  |  |  | 0.5 |  |  |  | 2.1 |  |  |  | 2.1 |  |  |  | 3.3 |
Right-of-use assets obtained in exchange for lease liabilities |  |  | 24.6 |  |  |  | — |  |  |  | 71.1 |  |  |  | 1.1 |  |  |  | — |  |  |  | 2.1 |  |  |  | 23.5 |  |  |  | — |  |  |  | 10.0 |
Schedule of Balance Sheet and Weighted Average Information About Operating Leases [Table Text Block] |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Right-of-use assets |  | $ | 73.7 |  |  | $ | 60.4 |  |  | $ | 1.7 |  |  | $ | 1.4 |  |  | $ | 20.2 |  |  | $ | 4.8 |
Lease liabilities, current |  |  | 6.5 |  |  |  | 6.5 |  |  |  | 0.4 |  |  |  | 0.3 |  |  |  | 1.9 |  |  |  | 1.9 |
Lease liabilities, noncurrent |  |  | 73.7 |  |  |  | 53.7 |  |  |  | 1.5 |  |  |  | 1.0 |  |  |  | 24.6 |  |  |  | 2.7 |
Weighted-average remaining lease term (in years) |  |  | 15.0 |  |  |  | 15.3 |  |  |  | 5.1 |  |  |  | 4.5 |  |  |  | 14.3 |  |  |  | 2.3 |
Weighted-average discount rate |  |  | 4.1 | % |  |  | 4.2 | % |  |  | 2.2 | % |  |  | 2.5 | % |  |  | 3.7 | % |  |  | 2.2 | %
Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
2023 |  | $ | 6.7 |  |  | $ | 0.4 |  |  | $ | 1.9 |
2024 |  |  | 7.3 |  |  |  | 0.5 |  |  |  | 2.1 |
2025 |  |  | 7.4 |  |  |  | 0.4 |  |  |  | 2.1 |
2026 |  |  | 7.3 |  |  |  | 0.3 |  |  |  | 2.2 |
2027 |  |  | 7.3 |  |  |  | 0.2 |  |  |  | 2.3 |
Thereafter |  |  | 72.8 |  |  |  | 0.2 |  |  |  | 24.1 |
Total undiscounted lease payments |  |  | 108.8 |  |  |  | 2.0 |  |  |  | 34.7 |
Less present value discount |  |  | (28.6 | ) |  |  | (0.1 | ) |  |  | (8.2 | )
Total current and noncurrent lease liabilities |  | $ | 80.2 |  |  | $ | 1.9 |  |  | $ | 26.5 |

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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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