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v3.23.1

Note 2 - Revenue - Disaggregated of Revenue (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Operating Revenues |  | $ 2,198.5 | $ 2,235.5 | $ 1,855.4
Gas Utility [Member] | Operating Segments [Member] |  |  |  |
Operating Revenues |  | 1,946.1 | 2,119.3 | 1,752.0
Gas Marketing [Member] | Operating Segments [Member] |  |  |  |
Operating Revenues |  | 234.9 | 96.5 | 87.9
Midstream [Member] | Operating Segments [Member] |  |  |  |
Operating Revenues |  | 53.1 | 52.6 | 43.1
Other Segments [Member] | Operating Segments [Member] |  |  |  |
Operating Revenues |  | 16.1 | 15.1 | 14.7
Spire [Member] |  |  |  |
Operating Revenues |  | 2,198.5 | 2,235.5 | 1,855.4
Spire [Member] | Operating Segments [Member] |  |  |  |
Operating Revenues |  | 2,250.2 | 2,283.5 | 1,897.7
Spire [Member] | Consolidation, Eliminations [Member] |  |  |  |
Operating Revenues |  | (51.7) |  | (42.3)
Spire [Member] | Segment Reconciling Items [Member] |  |  |  |
Operating Revenues |  |  | (48.0) |
Spire [Member] | Gas Utility [Member] | Operating Segments [Member] |  |  |  |
Revenue |  | 1,935.4 | 2,117.8 | 1,747.7
Changes in accrued revenue under alternative revenue programs |  | 10.7 | 1.5 | 4.3
Total Gas Utility operating revenues |  | 1,946.1 | 2,119.3 | 1,752.0
Spire [Member] | Gas Utility [Member] | Operating Segments [Member] | Residential [Member] |  |  |  |
Revenue |  | 1,416.6 | 1,234.0 | 1,184.3
Spire [Member] | Gas Utility [Member] | Operating Segments [Member] | Commercial and Industrial [Member] |  |  |  |
Revenue |  | 338.9 | 586.0 | 383.0
Spire [Member] | Gas Utility [Member] | Operating Segments [Member] | Transportation [Member] |  |  |  |
Revenue |  | 118.0 | 122.9 | 115.8
Spire [Member] | Gas Utility [Member] | Operating Segments [Member] | Off-system and Other Incentive [Member] |  |  |  |
Revenue |  | 42.0 | 152.7 | 38.4
Spire [Member] | Gas Utility [Member] | Operating Segments [Member] | Other Customer Revenue [Member] |  |  |  |
Revenue |  | 19.9 | 22.2 | 26.2
Spire [Member] | Gas Marketing [Member] | Operating Segments [Member] |  |  |  |
Unregulated Operating Revenue |  | 234.9 | 96.5 | 87.9
Spire [Member] | Midstream [Member] | Operating Segments [Member] |  |  |  |
Unregulated Operating Revenue |  | 53.1 | 52.6 | 43.1
Spire [Member] | Other Segments [Member] | Operating Segments [Member] |  |  |  |
Unregulated Operating Revenue |  | 16.1 | 15.1 | 14.7
Spire Missouri [Member] |  |  |  |
Changes in accrued revenue under alternative revenue programs |  | 12.8 | 3.0 | 2.3
Total Gas Utility operating revenues | $ 100.0 |  |  |
Operating Revenues |  | 1,321.0 | 1,516.6 | 1,193.6
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member] |  |  |  |
Revenue |  | 1,308.2 | 1,513.6 | 1,191.3
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member] | Residential [Member] |  |  |  |
Revenue |  | 1,061.4 | 882.1 | 859.6
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member] | Commercial and Industrial [Member] |  |  |  |
Revenue |  | 177.2 | 436.1 | 241.4
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member] | Transportation [Member] |  |  |  |
Revenue |  | 33.3 | 33.5 | 32.9
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member] | Off-system and Other Incentive [Member] |  |  |  |
Revenue |  | 25.2 | 145.6 | 35.1
Spire Missouri [Member] | Gas Utility [Member] | Operating Segments [Member] | Other Customer Revenue [Member] |  |  |  |
Revenue |  | 11.1 | 16.3 | 22.3
Spire Alabama Inc [Member] |  |  |  |
Changes in accrued revenue under alternative revenue programs |  | 1.7 | 3.4 | (0.2)
Operating Revenues |  | 509.1 | 494.0 | 455.0
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member] |  |  |  |
Revenue |  | 507.4 | 490.6 | 455.2
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member] | Residential [Member] |  |  |  |
Revenue |  | 291.6 | 288.0 | 267.8
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member] | Commercial and Industrial [Member] |  |  |  |
Revenue |  | 119.1 | 114.9 | 109.4
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member] | Transportation [Member] |  |  |  |
Revenue |  | 74.4 | 78.7 | 72.9
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member] | Off-system and Other Incentive [Member] |  |  |  |
Revenue |  | 16.8 | 7.1 | 3.2
Spire Alabama Inc [Member] | Gas Utility [Member] | Operating Segments [Member] | Other Customer Revenue [Member] |  |  |  |
Revenue |  | $ 5.5 | $ 1.9 | $ 1.9

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