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Revenue Recognition - Schedule of Contract Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Sep. 30, 2020
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