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Leases - Components of Lease Costs (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Lease Cost [Abstract]    
Operating lease cost $ 13.6 $ 42.4
Variable lease cost 12.0 33.8
Short-term lease cost $ 1.7 $ 3.5