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Revenue recognition - ESP and Voucher Promotions (Details) - USD ($)
$ in Millions
May 05, 2018
Feb. 03, 2018
Apr. 29, 2017
Jan. 28, 2017
Deferred Revenue Arrangement [Line Items]        
Voucher promotions and other $ 38.9 $ 41.4 $ 27.0  
Total deferred revenue 952.4 957.5 930.7  
Deferred revenue 284.9 288.6 272.1  
Non-current liabilities 667.5 668.9 658.6  
Sterling Jewelers        
Deferred Revenue Arrangement [Line Items]        
ESP deferred revenue $ 913.5 $ 916.1 $ 903.7 $ 905.6