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Revenue - Schedule of Changes in Deferred Revenue (Details)
$ in Millions
3 Months Ended
Dec. 31, 2019
USD ($)
Revenue From Contract With Customer [Abstract]  
Balance, October 1, 2019 $ 49.1
Recognition of revenue (214.7)
Deferral of revenue 232.1
Balance, December 31, 2019 $ 66.5