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Warranty reserve (Details) - USD ($)
$ in Millions
Aug. 03, 2019
May 04, 2019
Feb. 02, 2019
Aug. 04, 2018
May 05, 2018
Feb. 03, 2018
Other Liabilities Disclosure [Abstract]            
Current liabilities $ 10.2   $ 10.0 $ 11.2    
Non-current liabilities 23.9   23.2 25.2    
Product warranty accrual $ 34.1 $ 33.8 $ 33.2 $ 36.4 $ 35.6 $ 37.2