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Summary of Significant Accounting Policies - Other non-operating income (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Accounting Policies [Abstract]      
Gains (losses) on foreign currency contracts, net $ 37.7 $ 16.2 $ (23.9)
Pension and other postretirement plans non-service expense 0.5 (0.6) (5.8)
Total other non-operating income (expense), net $ 38.2 $ 15.6 $ (29.7)