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Note 8 - Fair Value of Financial Instruments (Tables) | 12 Months Ended
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Sep. 30, 2023
Notes Tables |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  |  |  |  |  |  |  |  |  | Classification of |
|  |  |  |  |  |  |  |  |  | Estimated Fair Value |
|  |  |  |  |  |  |  |  |  | Quoted |  |  |  |  |
|  |  |  |  |  |  |  |  |  | Prices in |  |  | Significant |
|  |  |  |  |  |  |  |  |  | Active |  |  | Observable |
|  | Carrying |  |  | Fair |  |  | Markets |  |  | Inputs |
|  | Amount |  |  | Value |  |  | (Level 1) |  |  | (Level 2) |
Spire |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
As of September 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 5.6 |  |  | $ | 5.6 |  |  | $ | 5.6 |  |  | $ | — |
Notes payable |  |  | 955.5 |  |  |  | 955.5 |  |  |  | — |  |  |  | 955.5 |
Long-term debt, including current portion |  |  | 3,710.6 |  |  |  | 3,270.2 |  |  |  | — |  |  |  | 3,270.2 |
As of September 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 6.5 |  |  | $ | 6.5 |  |  | $ | 6.5 |  |  | $ | — |
Notes payable |  |  | 1,037.5 |  |  |  | 1,037.5 |  |  |  | — |  |  |  | 1,037.5 |
Long-term debt, including current portion |  |  | 3,239.7 |  |  |  | 2,851.8 |  |  |  | — |  |  |  | 2,851.8 |
Spire Missouri |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
As of September 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 0.8 |  |  | $ | 0.8 |  |  | $ | 0.8 |  |  | $ | — |
Notes payable - associated companies |  |  | 540.6 |  |  |  | 540.6 |  |  |  | — |  |  |  | 540.6 |
Long-term debt |  |  | 1,785.4 |  |  |  | 1,592.4 |  |  |  | — |  |  |  | 1,592.4 |
As of September 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable - associated companies |  | $ | 445.3 |  |  | $ | 445.3 |  |  | $ | — |  |  | $ | 445.3 |
Long-term debt, including current portion |  |  | 1,637.7 |  |  |  | 1,473.9 |  |  |  | — |  |  |  | 1,473.9 |
Spire Alabama |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
As of September 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 1.2 |  |  | $ | 1.2 |  |  | $ | 1.2 |  |  | $ | — |
Notes payable - associated companies |  |  | 124.1 |  |  |  | 124.1 |  |  |  | — |  |  |  | 124.1 |
Long-term debt |  |  | 745.9 |  |  |  | 648.0 |  |  |  | — |  |  |  | 648.0 |
As of September 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 2.4 |  |  | $ | 2.4 |  |  | $ | 2.4 |  |  | $ | — |
Notes payable - associated companies |  |  | 260.9 |  |  |  | 260.9 |  |  |  | — |  |  |  | 260.9 |
Long-term debt |  |  | 571.5 |  |  |  | 485.0 |  |  |  | — |  |  |  | 485.0 |

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