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v3.23.3

Note 2 - Revenue - Disaggregated of Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Operating Revenues | $ 2,666.3 | $ 2,198.5 | $ 2,235.5
Consolidation, Eliminations [Member] |  |  |
Operating Revenues | (52.5) | (51.7) | (48.0)
Gas Utility [Member] | Operating Segments [Member] |  |  |
Operating Revenues | 2,456.9 | 1,946.1 | 2,119.3
Gas Marketing [Member] | Operating Segments [Member] |  |  |
Operating Revenues | 179.1 | 234.9 | 96.5
Midstream [Member] | Operating Segments [Member] |  |  |
Operating Revenues | 66.1 | 53.1 | 52.6
Other Segments [Member] | Consolidation, Eliminations [Member] |  |  |
Operating Revenues | 16.7 | 16.1 | 15.1
Spire [Member] |  |  |
Operating Revenues | 2,666.3 | 2,198.5 | 2,235.5
Spire [Member] | Operating Segments [Member] |  |  |
Operating Revenues | 2,718.8 | 2,250.2 | 2,283.5
Spire [Member] | Consolidation, Eliminations [Member] |  |  |
Operating Revenues | (52.5) |  | (48.0)
Spire [Member] | Segment Reconciling Items [Member] |  |  |
Operating Revenues |  | (51.7) |
Spire [Member] | Gas Utility [Member] | Operating Segments [Member] |  |  |
Revenue | 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
Spire [Member] | Gas Utility [Member] | Operating Segments [Member] | Residential [Member] |  |  |
Revenue | 1,648.5 | 1,416.6 | 1,234.0
Spire [Member] | Gas Utility [Member] | Operating Segments [Member] | Commercial and Industrial [Member] |  |  |
Revenue | 606.0 | 338.9 | 586.0
Spire [Member] | Gas Utility [Member] | Operating Segments [Member] | Transportation [Member] |  |  |
Revenue | 121.6 | 118.0 | 122.9
Spire [Member] | Gas Utility [Member] | Operating Segments [Member] | Off-system and Other Incentive [Member] |  |  |
Revenue | 30.0 | 42.0 | 152.7
Spire [Member] | Gas Utility [Member] | Operating Segments [Member] | Other Customer Revenue [Member] |  |  |
Revenue | 16.1 | 19.9 | 22.2
Spire [Member] | Gas Marketing [Member] | Operating Segments [Member] |  |  |
Unregulated Operating Revenue | 179.1 | 234.9 | 96.5
Spire [Member] | Midstream [Member] | Operating Segments [Member] |  |  |
Unregulated Operating Revenue | 66.1 | 53.1 | 52.6
Spire [Member] | Other Segments [Member] | Operating Segments [Member] |  |  |
Unregulated Operating Revenue | 16.7 | 16.1 | 15.1
Spire Missouri [Member] |  |  |
Changes in accrued revenue under alternative revenue programs | 23.9 | 12.8 | 3.0
Operating Revenues | 1,762.9 | 1,321.0 | 1,516.6
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member] |  |  |
Revenue | 1,739.0 | 1,308.2 | 1,513.6
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member] | Residential [Member] |  |  |
Revenue | 1,261.3 | 1,061.4 | 882.1
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member] | Commercial and Industrial [Member] |  |  |
Revenue | 411.9 | 177.2 | 436.1
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member] | Transportation [Member] |  |  |
Revenue | 33.2 | 33.3 | 33.5
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member] | Off-system and Other Incentive [Member] |  |  |
Revenue | 20.1 | 25.2 | 145.6
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member] | Other Customer Revenue [Member] |  |  |
Revenue | 12.5 | 11.1 | 16.3
Spire Alabama Inc [Member] |  |  |
Changes in accrued revenue under alternative revenue programs | 6.7 | 1.7 | 3.4
Operating Revenues | 571.1 | 509.1 | 494.0
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member] |  |  |
Revenue | 564.4 | 507.4 | 490.6
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member] | Residential [Member] |  |  |
Revenue | 322.9 | 291.6 | 288.0
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member] | Commercial and Industrial [Member] |  |  |
Revenue | 150.4 | 119.1 | 114.9
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member] | Transportation [Member] |  |  |
Revenue | 77.6 | 74.4 | 78.7
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member] | Off-system and Other Incentive [Member] |  |  |
Revenue | 9.9 | 16.8 | 7.1
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member] | Other Customer Revenue [Member] |  |  |
Revenue | $ 3.6 | $ 5.5 | $ 1.9

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