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Goodwill and intangibles - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Nov. 03, 2018
Oct. 28, 2017
Nov. 03, 2018
Oct. 28, 2017
Feb. 03, 2018
Sep. 12, 2017
Jan. 28, 2017
Finite-Lived Intangible Assets [Line Items]              
Goodwill $ 509.0 $ 867.1 $ 509.0 $ 867.1 $ 821.7   $ 517.6
Goodwilll, acquired during period       301.7      
Goodwill and intangible impairments 0.0 $ 0.0 448.7 $ 0.0      
Impairment     $ 308.8        
R2Net Inc.              
Finite-Lived Intangible Assets [Line Items]              
Goodwill           $ 299.1  
Sterling Jewelers              
Finite-Lived Intangible Assets [Line Items]              
Impairment 23.2            
Zale Jewelry              
Finite-Lived Intangible Assets [Line Items]              
Impairment 285.6            
Impairment of intangible assets (excluding goodwill) $ 139.9