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Revenue recognition - Unamortized Deferred Selling Costs (Details) - USD ($)
$ in Millions
Oct. 31, 2020
Feb. 01, 2020
Nov. 02, 2019
Revenue from Contract with Customer [Abstract]      
Other current assets $ 24.0 $ 23.6 $ 23.5
Other assets 81.7 80.0 76.1
Total deferred selling costs $ 105.7 $ 103.6 $ 99.6