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Deferred revenue (Details) - USD ($)
$ in Millions
Oct. 29, 2016
Jul. 30, 2016
Jan. 30, 2016
Oct. 31, 2015
Aug. 01, 2015
Jan. 31, 2015
Deferred Revenue Arrangement [Line Items]            
Voucher promotions and other $ 23.4   $ 28.2 $ 21.6    
Total deferred revenue 888.8   889.4 838.9    
Current liabilities 256.7   260.3 241.4    
Non-current liabilities 632.1   629.1 597.5    
Sterling Jewelers            
Deferred Revenue Arrangement [Line Items]            
ESP deferred revenue 710.2 $ 720.3 715.1 684.7 $ 691.4 $ 668.9
Zale Jewelry            
Deferred Revenue Arrangement [Line Items]            
ESP deferred revenue $ 155.2   $ 146.1 $ 132.6