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Derivatives Gain (Loss) on Fair Value Hedges Recognized in Earnings (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Mar. 31, 2018
Apr. 01, 2017
Foreign Exchange Forward [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Forward foreign currency contracts $ (3.8) $ (2.1) $ (2.5) $ 7.5