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Revenue recognition - ESP and Voucher Promotions (Details) - USD ($)
$ in Millions
Aug. 04, 2018
May 05, 2018
Feb. 03, 2018
Jul. 29, 2017
Apr. 29, 2017
Jan. 28, 2017
Deferred Revenue Arrangement [Line Items]            
Voucher promotions and other $ 33.0   $ 41.4 $ 18.9    
Total deferred revenue 939.6   957.5 921.1    
Deferred revenue 276.3   288.6 262.3    
Non-current liabilities 663.3   668.9 658.8    
Sterling Jewelers            
Deferred Revenue Arrangement [Line Items]            
ESP deferred revenue $ 906.6 $ 913.5 $ 916.1 $ 902.2 $ 903.7 $ 905.6