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Goodwill and intangibles - Summary of Goodwill (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Aug. 04, 2018
Aug. 04, 2018
Jul. 29, 2017
Goodwill [Roll Forward]      
Beginning Balance   $ 821.7 $ 517.6
Acquisitions     301.7
Impairment   (308.8)  
Impact of foreign exchange and other adjustments   (3.9) 2.4
Ending Balance $ 509.0 509.0 519.9
Intangible assets, purchase accounting adjustments 2.6    
North America      
Goodwill [Roll Forward]      
Beginning Balance   818.1 514.0
Acquisitions     301.7
Impairment   (308.8)  
Impact of foreign exchange and other adjustments   (3.9) 2.4
Ending Balance 505.4 505.4  
Other      
Goodwill [Roll Forward]      
Beginning Balance   3.6 3.6
Acquisitions     0.0
Impairment   0.0  
Impact of foreign exchange and other adjustments   0.0 $ 0.0
Ending Balance $ 3.6 $ 3.6