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Financial Instruments and Risk Management - Derivative Instruments, Gain (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in Income $ 0.0 $ (2.2)  
Foreign currency contracts | Disposal Group, Disposed of by Sale, Not Discontinued Operations | VARTAAG      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized in Income 2.2    
Not Designated as Hedging Instrument | Foreign currency contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Estimated Fair Value Liability (0.5)   $ (0.2)
Gain (Loss) Recognized in Income $ (0.9) $ (0.9)