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Acquisition - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Millions
Oct. 28, 2017
Sep. 12, 2017
Jan. 28, 2017
Oct. 29, 2016
Jan. 30, 2016
Business Acquisition [Line Items]          
Goodwill $ 867.1   $ 517.6 $ 517.0 $ 515.5
R2Net Inc.          
Business Acquisition [Line Items]          
Cash and cash equivalents   $ 47.3      
Inventories   12.1      
Other current assets   9.7      
Property, plant and equipment   3.5      
Current liabilities   (41.4)      
Fair value of net assets acquired   31.2      
Goodwill   348.5      
Total consideration transferred   $ 379.7