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Financial Instruments and Risk Management - Derivative Instruments, Gain (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]          
Gain (Loss) Recognized in Income $ (0.9) $ 9.9 $ 8.1 $ 9.9  
Not Designated as Hedging Instrument | Foreign currency contracts          
Derivative Instruments, Gain (Loss) [Line Items]          
Estimated Fair Value Liability (1.0)   (1.0)   $ (0.1)
Gain (Loss) Recognized in Income (1.3) $ 8.7 $ (0.2) $ 10.0  
Not Designated as Hedging Instrument | Foreign currency contracts | Other Items, Net | Divestment Business          
Derivative Instruments, Gain (Loss) [Line Items]          
Loss related to hedge contract $ 0.9