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Warranty reserve (Details) - USD ($)
$ in Millions
Nov. 02, 2019
Aug. 03, 2019
Feb. 02, 2019
Nov. 03, 2018
Aug. 04, 2018
Feb. 03, 2018
Other Liabilities Disclosure [Abstract]            
Current liabilities $ 10.8   $ 10.0 $ 10.4    
Non-current liabilities 25.7   23.2 23.9    
Total warranty reserve $ 36.5 $ 34.1 $ 33.2 $ 34.3 $ 36.4 $ 37.2