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Warranty reserve (Details) - USD ($)
$ in Millions
Aug. 01, 2020
May 02, 2020
Feb. 01, 2020
Aug. 03, 2019
May 04, 2019
Feb. 02, 2019
Other Liabilities Disclosure [Abstract]            
Current liabilities $ 11.0   $ 10.6 $ 10.2    
Non-current liabilities 26.3   25.7 23.9    
Total warranty reserve $ 37.3 $ 37.3 $ 36.3 $ 34.1 $ 33.8 $ 33.2