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v3.25.3

Revenue (Tables) | 12 Months Ended
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Sep. 30, 2025
Revenue from Contract with Customer [Abstract] |
Schedule of Revenue Disaggregated by Source and Customer Type |
|  | 2025 |  |  | 2024 |  |  | 2023 |
Spire |  |  |  |  |  |  |  |  |
Gas Utility: |  |  |  |  |  |  |  |  |
Residential |  | $ | 1,462.6 |  |  | $ | 1,617.4 |  |  | $ | 1,648.5 |
Commercial & industrial |  |  | 501.3 |  |  |  | 581.0 |  |  |  | 606.0 |
Transportation |  |  | 133.6 |  |  |  | 130.0 |  |  |  | 121.6 |
Off-system & other incentive |  |  | 65.3 |  |  |  | 37.0 |  |  |  | 30.0 |
Other customer revenue |  |  | 24.4 |  |  |  | 21.2 |  |  |  | 16.1 |
Total revenue from contracts with customers |  |  | 2,187.2 |  |  |  | 2,386.6 |  |  |  | 2,422.2 |
Changes in accrued revenue under alternative revenue programs |  |  | 20.3 |  |  |  | 51.3 |  |  |  | 34.7 |
Total Gas Utility operating revenues |  |  | 2,207.5 |  |  |  | 2,437.9 |  |  |  | 2,456.9 |
Gas Marketing |  |  | 157.2 |  |  |  | 99.2 |  |  |  | 179.1 |
Midstream |  |  | 155.5 |  |  |  | 100.7 |  |  |  | 66.1 |
Other |  |  | 20.6 |  |  |  | 17.6 |  |  |  | 16.7 |
Total before eliminations |  |  | 2,540.8 |  |  |  | 2,655.4 |  |  |  | 2,718.8 |
Intercompany eliminations |  |  | (64.4 | ) |  |  | (62.4 | ) |  |  | (52.5 | )
Total Operating Revenues |  | $ | 2,476.4 |  |  | $ | 2,593.0 |  |  | $ | 2,666.3 |
Spire Missouri |  |  |  |  |  |  |  |  |
Residential |  | $ | 1,092.1 |  |  | $ | 1,217.7 |  |  | $ | 1,261.3 |
Commercial & industrial |  |  | 326.0 |  |  |  | 390.9 |  |  |  | 411.9 |
Transportation |  |  | 35.9 |  |  |  | 34.1 |  |  |  | 33.2 |
Off-system & other incentive |  |  | 51.9 |  |  |  | 28.8 |  |  |  | 20.1 |
Other customer revenue |  |  | 14.0 |  |  |  | 14.9 |  |  |  | 12.5 |
Total revenue from contracts with customers |  |  | 1,519.9 |  |  |  | 1,686.4 |  |  |  | 1,739.0 |
Changes in accrued revenue under alternative revenue programs |  |  | 24.2 |  |  |  | 51.0 |  |  |  | 23.9 |
Total Operating Revenues |  | $ | 1,544.1 |  |  | $ | 1,737.4 |  |  | $ | 1,762.9 |
Spire Alabama |  |  |  |  |  |  |  |  |
Residential |  | $ | 307.5 |  |  | $ | 336.4 |  |  | $ | 322.9 |
Commercial & industrial |  |  | 134.5 |  |  |  | 149.5 |  |  |  | 150.4 |
Transportation |  |  | 87.3 |  |  |  | 85.1 |  |  |  | 77.6 |
Off-system & other incentive |  |  | 13.4 |  |  |  | 8.1 |  |  |  | 9.9 |
Other customer revenue |  |  | 6.3 |  |  |  | (0.4 | ) |  |  | 3.6 |
Total revenue from contracts with customers |  |  | 549.0 |  |  |  | 578.7 |  |  |  | 564.4 |
Changes in accrued revenue under alternative revenue programs |  |  | (3.8 | ) |  |  | 0.2 |  |  |  | 6.7 |
Total Operating Revenues |  | $ | 545.2 |  |  | $ | 578.9 |  |  | $ | 571.1 |
Schedule of Gross Receipts Taxes Associated Revenues |
|  | 2025 |  |  | 2024 |  |  | 2023 |
Spire |  | $ | 115.7 |  |  | $ | 128.2 |  |  | $ | 131.8 |
Spire Missouri |  |  | 82.9 |  |  |  | 93.1 |  |  |  | 96.7 |
Spire Alabama |  |  | 27.9 |  |  |  | 30.1 |  |  |  | 29.9 |

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