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Shareholders' equity - Share Repurchase (Details) - 2017 Program - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
9 Months Ended
Oct. 30, 2021
Oct. 31, 2020
Aug. 23, 2021
Aug. 22, 2021
Class of Stock [Line Items]        
Stock repurchase program, authorized amount $ 659.4      
Shares repurchased (shares) 0.5 0.0    
Amount repurchased $ 41.1 $ 0.0    
Average repurchase price per share (usd per share) $ 88.04      
Remaining authorized repurchase amount $ 183.9   $ 225.0 $ 165.6