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Note 15 - Regulatory Matters (Tables) | 12 Months Ended
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Sep. 30, 2023
Notes Tables |
Schedule of Regulatory Assets and Liabilities [Table Text Block] |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
September 30 |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Regulatory Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized purchased gas adjustments |  | $ | 293.2 |  |  | $ | 322.2 |  |  | $ | 269.4 |  |  | $ | 275.1 |  |  | $ | 21.7 |  |  | $ | 43.8 |
Other |  |  | 55.1 |  |  |  | 33.2 |  |  |  | 23.7 |  |  |  | 13.0 |  |  |  | 19.9 |  |  |  | 13.1 |
Total Current Regulatory Assets |  |  | 348.3 |  |  |  | 355.4 |  |  |  | 293.1 |  |  |  | 288.1 |  |  |  | 41.6 |  |  |  | 56.9 |
Noncurrent: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Future income taxes due from customers |  |  | 144.5 |  |  |  | 137.8 |  |  |  | 136.2 |  |  |  | 129.2 |  |  |  | 2.0 |  |  |  | 2.2 |
Pension and postretirement benefit costs |  |  | 261.0 |  |  |  | 294.5 |  |  |  | 189.1 |  |  |  | 222.9 |  |  |  | 67.8 |  |  |  | 66.5 |
Cost of removal |  |  | 633.2 |  |  |  | 493.7 |  |  |  | 97.0 |  |  |  | 25.2 |  |  |  | 536.2 |  |  |  | 468.5 |
Unamortized purchased gas adjustments |  |  | 23.0 |  |  |  | — |  |  |  | 23.0 |  |  |  | — |  |  |  | — |  |  |  | — |
Energy efficiency |  |  | 56.3 |  |  |  | 57.2 |  |  |  | 56.3 |  |  |  | 57.2 |  |  |  | — |  |  |  | — |
Other |  |  | 131.2 |  |  |  | 129.2 |  |  |  | 116.0 |  |  |  | 113.1 |  |  |  | 0.9 |  |  |  | 1.0 |
Total Noncurrent Regulatory Assets |  |  | 1,249.2 |  |  |  | 1,112.4 |  |  |  | 617.6 |  |  |  | 547.6 |  |  |  | 606.9 |  |  |  | 538.2 |
Total Regulatory Assets |  | $ | 1,597.5 |  |  | $ | 1,467.8 |  |  | $ | 910.7 |  |  | $ | 835.7 |  |  | $ | 648.5 |  |  | $ | 595.1 |
Regulatory Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other |  | $ | 7.3 |  |  | $ | 3.7 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Total Current Regulatory Liabilities |  |  | 7.3 |  |  |  | 3.7 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Noncurrent: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred taxes due to customers |  |  | 128.0 |  |  |  | 145.3 |  |  |  | 114.8 |  |  |  | 127.9 |  |  |  | — |  |  |  | — |
Pension and postretirement benefit costs |  |  | 185.2 |  |  |  | 172.6 |  |  |  | 156.5 |  |  |  | 143.6 |  |  |  | 17.9 |  |  |  | 19.4 |
Accrued cost of removal |  |  | 126.6 |  |  |  | 32.9 |  |  |  | 90.4 |  |  |  | — |  |  |  | — |  |  |  | — |
Unamortized purchased gas adjustments |  |  | 11.2 |  |  |  | 53.0 |  |  |  | 11.2 |  |  |  | 53.0 |  |  |  | — |  |  |  | — |
Other |  |  | 21.4 |  |  |  | 14.4 |  |  |  | 16.5 |  |  |  | 7.3 |  |  |  | 3.3 |  |  |  | 3.6 |
Total Noncurrent Regulatory Liabilities |  |  | 472.4 |  |  |  | 418.2 |  |  |  | 389.4 |  |  |  | 331.8 |  |  |  | 21.2 |  |  |  | 23.0 |
Total Regulatory Liabilities |  | $ | 479.7 |  |  | $ | 421.9 |  |  | $ | 389.4 |  |  | $ | 331.8 |  |  | $ | 21.2 |  |  | $ | 23.0 |
Schedule of Regulatory Assets Not Earning Return [Table Text Block] |
|  | Spire |  |  | Spire Missouri |
September 30 |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Pension and postretirement benefit costs |  | $ | 133.4 |  |  | $ | 152.9 |  |  | $ | 133.4 |  |  | $ | 152.9 |
Future income taxes due from customers |  |  | 142.5 |  |  |  | 135.6 |  |  |  | 136.2 |  |  |  | 129.2 |
Unamortized purchase gas adjustments |  |  | 292.4 |  |  |  | 275.1 |  |  |  | 292.4 |  |  |  | 275.1 |
Other |  |  | 104.2 |  |  |  | 122.7 |  |  |  | 104.2 |  |  |  | 122.7 |
Total Regulatory Assets Not Earning a Return |  | $ | 672.5 |  |  | $ | 686.3 |  |  | $ | 666.2 |  |  | $ | 679.9 |

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- Definition Tabular disclosure of assets that are created when regulatory agencies permit public utilities to defer certain costs included in rate-setting to the balance sheet and regulatory liabilities. Detailed information about liabilities that result from rate actions of a regulator. Rate actions of a regulator can impose a liability on a regulated enterprise resulting in a regulatory liability. + References No definition available. + Details
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