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Deferred revenue (Details) - USD ($)
$ in Millions
Jul. 29, 2017
Apr. 29, 2017
Jan. 28, 2017
Jul. 30, 2016
Apr. 30, 2016
Jan. 30, 2016
Deferred Revenue Arrangement [Line Items]            
Voucher promotions and other $ 18.9   $ 30.3 $ 17.9    
Total deferred revenue 921.1   935.9 894.4    
Current liabilities 262.3   276.9 254.5    
Non-current liabilities 658.8   659.0 639.9    
Sterling Jewelers            
Deferred Revenue Arrangement [Line Items]            
ESP deferred revenue 732.7 $ 736.0 737.4 720.3 $ 723.8 $ 715.1
Zale Jewelry            
Deferred Revenue Arrangement [Line Items]            
ESP deferred revenue $ 169.5   $ 168.2 $ 156.2