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Derivatives - Derivatives not Designated as Hedging Instruments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 29, 2017
Jul. 30, 2016
Jul. 29, 2017
Jul. 30, 2016
Not Designated as Hedging Instrument | Foreign currency contracts | Other Income        
Derivative [Line Items]        
Foreign currency contracts not designated as hedging $ 4.9 $ 1.9 $ 3.2 $ 1.6