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Revenue Recognition - Schedule of Contract Liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Sep. 30, 2020
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Contract With Customer Liability [Abstract] |  |
Customer advances | $ 623.3 | $ 491.4
Other current liabilities | 82.6 | 59.5
Other long-term liabilities | 77.9 | 53.7
Total contract liabilities | $ 783.8 | $ 604.6

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