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Shareholders' equity - Narrative (Details) - USD ($)
 3 Months Ended 9 Months Ended 69 Months Ended
Oct. 28, 2023
Jul. 29, 2023
Apr. 29, 2023
Oct. 29, 2022
Jul. 30, 2022
Apr. 30, 2022
Oct. 28, 2023
Oct. 29, 2022
Oct. 28, 2023
Mar. 31, 2023
Jan. 28, 2023
Class of Stock [Line Items]                      
Amount of preferred dividends in arrears $ 0     $ 0     $ 0 $ 0      
Amount repurchased 35,100,000 $ 43,300,000 $ 39,100,000 $ 20,200,000 $ 22,800,000 $ 268,200,000          
2017 Program                      
Class of Stock [Line Items]                      
Stock repurchase program, authorized amount                     $ 1,700,000,000
Remaining authorized repurchase amount $ 682,800,000           682,800,000   $ 682,800,000 $ 775,000,000 $ 537,300,000
Amount repurchased             $ 117,500,000 $ 361,200,000 $ 1,200,000,000