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Derivatives - Schedule of Derivatives Not Designated as Hedges (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Foreign exchange contracts | Other non-operating (income) expense      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivatives not designated as hedges $ (7.3) $ 47.3 $ (2.3)