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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. 30, 2019
Mar. 31, 2018
Mar. 30, 2019
Mar. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments $ (1.8) $ (2.1) $ (3.5) $ (2.3)
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax 1.4 1.7 2.0 0.2
Forward foreign currency contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Forward foreign currency contracts $ 0.4 $ (3.8) $ 5.5 $ (2.5)