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Acquisition - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Millions
9 Months Ended
Oct. 28, 2017
Nov. 03, 2018
Feb. 03, 2018
Sep. 12, 2017
Jan. 28, 2017
Business Acquisition [Line Items]          
Goodwilll, acquired during period $ 301.7        
Goodwill $ 867.1 $ 509.0 $ 821.7   $ 517.6
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       (42.4)  
Deferred tax liabilities       (25.1)  
Fair value of net assets acquired       79.9  
Goodwill       299.1  
Total consideration transferred       379.0  
Trade names | R2Net Inc.          
Business Acquisition [Line Items]          
Intangible assets       70.6  
Technology-related | R2Net Inc.          
Business Acquisition [Line Items]          
Intangible assets       $ 4.2