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Note 8 - Fair Value of Financial Instruments (Tables) | 12 Months Ended
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Sep. 30, 2022
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, 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 |
As of September 30, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 4.3 |  |  | $ | 4.3 |  |  | $ | 4.3 |  |  | $ | — |
Notes payable |  |  | 672.0 |  |  |  | 672.0 |  |  |  | — |  |  |  | 672.0 |
Long-term debt, including current portion |  |  | 2,994.9 |  |  |  | 3,375.9 |  |  |  | — |  |  |  | 3,375.9 |
Spire Missouri |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |
As of September 30, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note Payable |  | $ | 250.0 |  |  | $ | 250.0 |  |  | $ | — |  |  | $ | 250.0 |
Notes payable - associated companies |  |  | 240.9 |  |  |  | 240.9 |  |  |  | — |  |  |  | 240.9 |
Long-term debt |  |  | 1,338.4 |  |  |  | 1,540.4 |  |  |  | — |  |  |  | 1,540.4 |
Spire Alabama |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |
As of September 30, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable - associated companies |  | $ | 49.0 |  |  | $ | 49.0 |  |  | $ | — |  |  | $ | 49.0 |
Long-term debt, including current portion |  |  | 621.2 |  |  |  | 707.5 |  |  |  | — |  |  |  | 707.5 |

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