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Financial Instruments and Risk Management - Derivative Instruments, Gain (Loss) (Details) - Not Designated as Hedging Instrument - Foreign currency contracts - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]      
Estimated Fair Value Asset $ 0.5   $ 0.9
Gain Recognized in Income $ 0.3 $ (1.9)