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Note 15 - Regulatory Matters (Tables) | 12 Months Ended
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Sep. 30, 2022
Notes Tables |
Schedule of Regulatory Assets and Liabilities [Table Text Block] |
|  | Spire |  |  | Spire Missouri |  |  | Spire Alabama |
September 30 |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Regulatory Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and postretirement benefit costs |  | $ | — |  |  | $ | 31.1 |  |  | $ | — |  |  | $ | 21.9 |  |  | $ | — |  |  | $ | 8.2 |
Unamortized purchased gas adjustments |  |  | 322.2 |  |  |  | 243.5 |  |  |  | 275.1 |  |  |  | 242.8 |  |  |  | 43.8 |  |  |  | — |
Other |  |  | 33.2 |  |  |  | 31.9 |  |  |  | 13.0 |  |  |  | 11.6 |  |  |  | 13.1 |  |  |  | 10.6 |
Total Current Regulatory Assets |  |  | 355.4 |  |  |  | 306.5 |  |  |  | 288.1 |  |  |  | 276.3 |  |  |  | 56.9 |  |  |  | 18.8 |
Noncurrent: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Future income taxes due from customers |  |  | 137.8 |  |  |  | 132.9 |  |  |  | 129.2 |  |  |  | 124.2 |  |  |  | 2.2 |  |  |  | 2.2 |
Pension and postretirement benefit costs |  |  | 294.5 |  |  |  | 313.8 |  |  |  | 222.9 |  |  |  | 226.0 |  |  |  | 66.5 |  |  |  | 82.9 |
Cost of removal |  |  | 493.7 |  |  |  | 431.9 |  |  |  | 25.2 |  |  |  | 34.9 |  |  |  | 468.5 |  |  |  | 397.0 |
Energy efficiency |  |  | 57.2 |  |  |  | 47.6 |  |  |  | 57.2 |  |  |  | 47.6 |  |  |  | — |  |  |  | — |
Other |  |  | 129.2 |  |  |  | 67.3 |  |  |  | 113.1 |  |  |  | 50.4 |  |  |  | 1.0 |  |  |  | 1.2 |
Total Noncurrent Regulatory Assets |  |  | 1,112.4 |  |  |  | 993.5 |  |  |  | 547.6 |  |  |  | 483.1 |  |  |  | 538.2 |  |  |  | 483.3 |
Total Regulatory Assets |  | $ | 1,467.8 |  |  | $ | 1,300.0 |  |  | $ | 835.7 |  |  | $ | 759.4 |  |  | $ | 595.1 |  |  | $ | 502.1 |
Regulatory Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension and postretirement benefit costs |  | $ | — |  |  | $ | 5.8 |  |  | $ | — |  |  | $ | 3.6 |  |  | $ | — |  |  | $ | 2.2 |
Unamortized purchased gas adjustments |  |  | — |  |  |  | 11.0 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 10.2 |
Other |  |  | 3.7 |  |  |  | 17.8 |  |  |  | — |  |  |  | 13.5 |  |  |  | — |  |  |  | 1.0 |
Total Current Regulatory Liabilities |  |  | 3.7 |  |  |  | 34.6 |  |  |  | — |  |  |  | 17.1 |  |  |  | — |  |  |  | 13.4 |
Noncurrent: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred taxes due to customers |  |  | 145.3 |  |  |  | 127.5 |  |  |  | 127.9 |  |  |  | 110.2 |  |  |  | — |  |  |  | — |
Pension and postretirement benefit costs |  |  | 172.6 |  |  |  | 159.3 |  |  |  | 143.6 |  |  |  | 131.4 |  |  |  | 19.4 |  |  |  | 19.8 |
Accrued cost of removal |  |  | 32.9 |  |  |  | 36.2 |  |  |  | — |  |  |  | 4.9 |  |  |  | — |  |  |  | — |
Unamortized purchased gas adjustments |  |  | 53.0 |  |  |  | 284.3 |  |  |  | 53.0 |  |  |  | 284.3 |  |  |  | — |  |  |  | — |
Other |  |  | 14.4 |  |  |  | 13.6 |  |  |  | 7.3 |  |  |  | 8.0 |  |  |  | 3.6 |  |  |  | 3.6 |
Total Noncurrent Regulatory Liabilities |  |  | 418.2 |  |  |  | 620.9 |  |  |  | 331.8 |  |  |  | 538.8 |  |  |  | 23.0 |  |  |  | 23.4 |
Total Regulatory Liabilities |  | $ | 421.9 |  |  | $ | 655.5 |  |  | $ | 331.8 |  |  | $ | 555.9 |  |  | $ | 23.0 |  |  | $ | 36.8 |
Schedule of Regulatory Assets Not Earning Return [Table Text Block] |
|  | Spire |  |  | Spire Missouri |
September 30 |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Pension and postretirement benefit costs |  | $ | 152.9 |  |  | $ | 165.7 |  |  | $ | 152.9 |  |  | $ | 165.7 |
Future income taxes due from customers |  |  | 135.6 |  |  |  | 130.7 |  |  |  | 129.2 |  |  |  | 124.2 |
Unamortized purchase gas adjustments |  |  | 275.1 |  |  |  | 242.8 |  |  |  | 275.1 |  |  |  | 242.8 |
Other |  |  | 122.7 |  |  |  | 86.0 |  |  |  | 122.7 |  |  |  | 86.0 |
Total Regulatory Assets Not Earning a Return |  | $ | 686.3 |  |  | $ | 625.2 |  |  | $ | 679.9 |  |  | $ | 618.7 |

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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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