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Derivatives - Derivatives not Designated as Hedging Instruments (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Oct. 28, 2017
Oct. 29, 2016
Oct. 28, 2017
Oct. 29, 2016
Not Designated as Hedging Instrument | Foreign currency contracts | Other Income        
Derivative [Line Items]        
Foreign currency contracts not designated as hedging $ (0.1) $ 1.6 $ 3.1 $ 3.2