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Revenue recognition - Unamortized Deferred Selling Costs (Details) - USD ($)
$ in Millions
Aug. 01, 2020
Feb. 01, 2020
Aug. 03, 2019
Revenue from Contract with Customer [Abstract]      
Other current assets $ 30.2 $ 23.6 $ 20.6
Other assets 76.4 80.0 76.5
Total deferred selling costs $ 106.6 $ 103.6 $ 97.1