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Revenue recognition - ESP and Voucher Promotions (Details) - USD ($)
$ in Millions
Nov. 03, 2018
Aug. 04, 2018
Feb. 03, 2018
Oct. 28, 2017
Jul. 29, 2017
Jan. 28, 2017
Deferred Revenue Arrangement [Line Items]            
Voucher promotions and other $ 32.0   $ 41.4 $ 33.6    
Total deferred revenue 924.8   957.5 916.4    
Deferred revenue 253.1   288.6 270.3    
Non-current liabilities 671.7   668.9 646.1    
Sterling Jewelers            
Deferred Revenue Arrangement [Line Items]            
ESP deferred revenue $ 892.8 $ 906.6 $ 916.1 $ 882.8 $ 902.2 $ 905.6