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Revenue Recognition - Schedule of Contract Liabilities Recognized in Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Contract With Customer Liability [Abstract]        
Beginning liabilities recognized in revenue $ 158.2 $ 102.2 $ 476.1 $ 392.8