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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. 28, 2020
Mar. 30, 2019
Mar. 28, 2020
Mar. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments $ (0.1)      
Derivative instruments not designated as hedges, gain (loss) 3.3 $ 0.4 $ 0.2 $ 5.5
Forward foreign currency contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Forward foreign currency contracts 2.7 0.4 1.3 5.5
Foreign currency option contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative instruments not designated as hedges, gain (loss) $ 0.6 $ 0.0 $ (1.1) $ 0.0