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Revenue - Unearned Revenue (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Unearned Revenue (Details) |  |  |  |
Unearned Revenue | $ 35.0 | $ 23.0 | $ 27.9 | $ 21.6
Contract with Customer, Liability, Revenue Recognized | $ 7.4 | $ 6.1 |  |

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