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Revenue (Tables) | 6 Months Ended
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Mar. 31, 2021
Revenue From Contract With Customer [Abstract] |
Schedule of Revenue Disaggregated by Source and Customer Type | The following tables show revenue disaggregated by source and customer type.
|  | Three Months Ended March 31, |  |  | Six Months Ended March 31, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Spire |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gas Utility: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 537.6 |  |  | $ | 471.9 |  |  | $ | 887.5 |  |  | $ | 840.3 |
Commercial & industrial |  |  | 369.2 |  |  |  | 156.8 |  |  |  | 472.2 |  |  |  | 279.3 |
Transportation |  |  | 34.2 |  |  |  | 32.5 |  |  |  | 66.4 |  |  |  | 63.5 |
Off-system & other incentive |  |  | 130.6 |  |  |  | 9.3 |  |  |  | 139.9 |  |  |  | 18.7 |
Other customer revenue |  |  | (11.9 | ) |  |  | 3.2 |  |  |  | (9.7 | ) |  |  | 5.6 |
Total revenue from contracts with customers |  |  | 1,059.7 |  |  |  | 673.7 |  |  |  | 1,556.3 |  |  |  | 1,207.4 |
Changes in accrued revenue under alternative revenue programs |  |  | (6.6 | ) |  |  | 5.3 |  |  |  | (5.0 | ) |  |  | 2.3 |
Total Gas Utility operating revenues |  |  | 1,053.1 |  |  |  | 679.0 |  |  |  | 1,551.3 |  |  |  | 1,209.7 |
Gas Marketing |  |  | 33.4 |  |  |  | 33.3 |  |  |  | 58.2 |  |  |  | 65.6 |
Other |  |  | 15.6 |  |  |  | 14.7 |  |  |  | 32.3 |  |  |  | 25.8 |
Total before eliminations |  |  | 1,102.1 |  |  |  | 727.0 |  |  |  | 1,641.8 |  |  |  | 1,301.1 |
Intersegment eliminations (see Note 9, Information by Operating Segment) |  |  | 2.8 |  |  |  | (11.5 | ) |  |  | (24.3 | ) |  |  | (18.7 | )
Total Operating Revenues |  | $ | 1,104.9 |  |  | $ | 715.5 |  |  | $ | 1,617.5 |  |  | $ | 1,282.4 |
Spire Missouri |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 365.4 |  |  | $ | 331.1 |  |  | $ | 628.4 |  |  | $ | 607.0 |
Commercial & industrial |  |  | 304.0 |  |  |  | 99.2 |  |  |  | 373.9 |  |  |  | 180.0 |
Transportation |  |  | 9.9 |  |  |  | 9.7 |  |  |  | 18.9 |  |  |  | 18.7 |
Off-system & other incentive |  |  | 128.5 |  |  |  | 9.3 |  |  |  | 135.9 |  |  |  | 18.7 |
Other customer revenue |  |  | (17.5 | ) |  |  | 0.9 |  |  |  | (14.6 | ) |  |  | 1.4 |
Total revenue from contracts with customers |  |  | 790.3 |  |  |  | 450.2 |  |  |  | 1,142.5 |  |  |  | 825.8 |
Changes in accrued revenue under alternative revenue programs |  |  | 0.6 |  |  |  | 7.3 |  |  |  | 3.9 |  |  |  | 5.7 |
Total Operating Revenues |  | $ | 790.9 |  |  | $ | 457.5 |  |  | $ | 1,146.4 |  |  | $ | 831.5 |
Spire Alabama |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential |  | $ | 144.8 |  |  | $ | 120.5 |  |  | $ | 214.0 |  |  | $ | 194.8 |
Commercial & industrial |  |  | 53.2 |  |  |  | 46.2 |  |  |  | 77.5 |  |  |  | 77.5 |
Transportation |  |  | 21.7 |  |  |  | 19.9 |  |  |  | 42.2 |  |  |  | 39.5 |
Off-system & other incentive |  |  | 1.9 |  |  |  | — |  |  |  | 3.9 |  |  |  | — |
Other customer revenue |  |  | 3.9 |  |  |  | 1.7 |  |  |  | 2.0 |  |  |  | 3.3 |
Total revenue from contracts with customers |  |  | 225.5 |  |  |  | 188.3 |  |  |  | 339.6 |  |  |  | 315.1 |
Changes in accrued revenue under alternative revenue programs |  |  | (2.9 | ) |  |  | (2.8 | ) |  |  | (3.4 | ) |  |  | (3.4 | )
Total Operating Revenues |  | $ | 222.6 |  |  | $ | 185.5 |  |  | $ | 336.2 |  |  | $ | 311.7 |
Schedule of Gross Receipts Taxes | The expense amounts (shown in the table below) are reported gross in the “Taxes, other than income taxes” line in the statements of income, and corresponding revenues are reported in “Operating Revenues.”
|  | Three Months Ended March 31, |  |  | Six Months Ended March 31, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Spire |  | $ | 42.2 |  |  | $ | 37.9 |  |  | $ | 63.9 |  |  | $ | 62.5 |
Spire Missouri |  |  | 28.6 |  |  |  | 26.2 |  |  |  | 43.8 |  |  |  | 43.4 |
Spire Alabama |  |  | 11.8 |  |  |  | 9.9 |  |  |  | 17.1 |  |  |  | 16.1 |

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