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Warranty reserve - Rollforward (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 29, 2017
Jul. 30, 2016
Jul. 29, 2017
Jul. 30, 2016
Movement in Standard Product Warranty Accrual [Roll Forward]        
Balance at beginning of period $ 39.2 $ 41.3 $ 40.0 $ 41.9
Warranty expense 2.5 2.8 4.8 5.7
Utilized (2.4) (3.7) (5.5) (7.2)
Balance at end of period $ 39.3 $ 40.4 $ 39.3 $ 40.4