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Revenue - Unearned Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
Unearned Revenue (Details) |  |  |  |  |  |  |  |
Unearned Revenue | $ 24.8 | $ 16.4 | $ 24.8 | $ 16.4 | $ 24.3 | $ 15.5 | $ 13.1 | $ 9.3
Contract with Customer, Liability, Revenue Recognized | 5.0 | $ 4.0 | 10.0 | $ 7.3 |  |  |  |
Ventus |  |  |  |  |  |  |  |
Unearned Revenue (Details) |  |  |  |  |  |  |  |
Unearned Revenue | $ 2.1 |  | $ 2.1 |  |  |  |  |

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