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Revenue - Schedule of Operating Revenue Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020
Disaggregation Of Revenue [Line Items] |  |  |  |
Total operating revenues | $ 1,104.9 | $ 715.5 | $ 1,617.5 | $ 1,282.4
Spire Missouri |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total operating revenues | 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 Missouri | Residential |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total operating revenues | 365.4 | 331.1 | 628.4 | 607.0
Spire Missouri | Commercial & Industrial |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total operating revenues | 304.0 | 99.2 | 373.9 | 180.0
Spire Missouri | Transportation |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total operating revenues | 9.9 | 9.7 | 18.9 | 18.7
Spire Missouri | Off-system & Other Incentive |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total operating revenues | 128.5 | 9.3 | 135.9 | 18.7
Spire Missouri | Other Customer Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total operating revenues | (17.5) | 0.9 | (14.6) | 1.4
Spire Alabama |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total operating revenues | 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
Spire Alabama | Residential |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total operating revenues | 144.8 | 120.5 | 214.0 | 194.8
Spire Alabama | Commercial & Industrial |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total operating revenues | 53.2 | 46.2 | 77.5 | 77.5
Spire Alabama | Transportation |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total operating revenues | 21.7 | 19.9 | 42.2 | 39.5
Spire Alabama | Off-system & Other Incentive |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total operating revenues | 1.9 |  | 3.9 |
Spire Alabama | Other Customer Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total operating revenues | $ 3.9 | $ 1.7 | $ 2.0 | $ 3.3

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