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Note 2 - Revenue (Tables) | 12 Months Ended
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Sep. 30, 2023
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | 2023 |  |  | 2022 |  |  | 2021 |
Spire |  |  |  |  |  |  |  |  |  |  |  |
Gas Utility: |  |  |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 1,648.5 |  |  | $ | 1,416.6 |  |  | $ | 1,234.0 |
Commercial & industrial |  |  | 606.0 |  |  |  | 338.9 |  |  |  | 586.0 |
Transportation |  |  | 121.6 |  |  |  | 118.0 |  |  |  | 122.9 |
Off-system & other incentive |  |  | 30.0 |  |  |  | 42.0 |  |  |  | 152.7 |
Other customer revenue |  |  | 16.1 |  |  |  | 19.9 |  |  |  | 22.2 |
Total revenue from contracts with customers |  |  | 2,422.2 |  |  |  | 1,935.4 |  |  |  | 2,117.8 |
Changes in accrued revenue under alternative revenue programs |  |  | 34.7 |  |  |  | 10.7 |  |  |  | 1.5 |
Total Gas Utility operating revenues |  |  | 2,456.9 |  |  |  | 1,946.1 |  |  |  | 2,119.3 |
Gas Marketing |  |  | 179.1 |  |  |  | 234.9 |  |  |  | 96.5 |
Midstream |  |  | 66.1 |  |  |  | 53.1 |  |  |  | 52.6 |
Other |  |  | 16.7 |  |  |  | 16.1 |  |  |  | 15.1 |
Total before eliminations |  |  | 2,718.8 |  |  |  | 2,250.2 |  |  |  | 2,283.5 |
Intersegment eliminations (see Note 14, Information by Operating Segment) |  |  | (52.5 | ) |  |  | (51.7 | ) |  |  | (48.0 | )
Total Operating Revenues |  | $ | 2,666.3 |  |  | $ | 2,198.5 |  |  | $ | 2,235.5 |
Spire Missouri |  |  |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 1,261.3 |  |  | $ | 1,061.4 |  |  | $ | 882.1 |
Commercial & industrial |  |  | 411.9 |  |  |  | 177.2 |  |  |  | 436.1 |
Transportation |  |  | 33.2 |  |  |  | 33.3 |  |  |  | 33.5 |
Off-system & other incentive |  |  | 20.1 |  |  |  | 25.2 |  |  |  | 145.6 |
Other customer revenue |  |  | 12.5 |  |  |  | 11.1 |  |  |  | 16.3 |
Total revenue from contracts with customers |  |  | 1,739.0 |  |  |  | 1,308.2 |  |  |  | 1,513.6 |
Changes in accrued revenue under alternative revenue programs |  |  | 23.9 |  |  |  | 12.8 |  |  |  | 3.0 |
Total Operating Revenues |  | $ | 1,762.9 |  |  | $ | 1,321.0 |  |  | $ | 1,516.6 |
Spire Alabama |  |  |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 322.9 |  |  | $ | 291.6 |  |  | $ | 288.0 |
Commercial & industrial |  |  | 150.4 |  |  |  | 119.1 |  |  |  | 114.9 |
Transportation |  |  | 77.6 |  |  |  | 74.4 |  |  |  | 78.7 |
Off-system & other incentive |  |  | 9.9 |  |  |  | 16.8 |  |  |  | 7.1 |
Other customer revenue |  |  | 3.6 |  |  |  | 5.5 |  |  |  | 1.9 |
Total revenue from contracts with customers |  |  | 564.4 |  |  |  | 507.4 |  |  |  | 490.6 |
Changes in accrued revenue under alternative revenue programs |  |  | 6.7 |  |  |  | 1.7 |  |  |  | 3.4 |
Total Operating Revenues |  | $ | 571.1 |  |  | $ | 509.1 |  |  | $ | 494.0 |
Schedule Of Taxes On Revenues [Table Text Block] |
|  | 2023 |  |  | 2022 |  |  | 2021 |
Spire |  | $ | 131.8 |  |  | $ | 109.8 |  |  | $ | 94.0 |
Spire Missouri |  |  | 96.7 |  |  |  | 79.6 |  |  |  | 64.3 |
Spire Alabama |  |  | 29.9 |  |  |  | 25.5 |  |  |  | 25.1 |

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