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Goodwill and intangibles - Summary of Goodwill (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Aug. 03, 2019
Feb. 02, 2019
May 05, 2018
Feb. 01, 2020
Feb. 02, 2019
Goodwill [Roll Forward]          
Beginning balance     $ 821.7 $ 296.6 $ 821.7
Impairment $ (47.7)     (47.7) (521.2)
Impact of foreign exchange       (0.1) (3.9)
Ending balance   $ 296.6   248.8 296.6
North America          
Goodwill [Roll Forward]          
Beginning balance     818.1 296.6 818.1
Impairment   (208.8) (308.8) (47.7) (517.6)
Impact of foreign exchange       (0.1) (3.9)
Ending balance   296.6   248.8 296.6
Other          
Goodwill [Roll Forward]          
Beginning balance     $ 3.6 0.0 3.6
Impairment       0.0 (3.6)
Impact of foreign exchange       0.0 0.0
Ending balance   0.0   0.0 0.0
R2Net Inc.          
Goodwill [Roll Forward]          
Beginning balance       $ 77.8  
Impairment $ (12.5)        
Ending balance   $ 77.8     77.8
Purchase accounting adjustments         $ 2.6