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Accounts receivable - Allowance for Credit Losses (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 29, 2022
Jan. 30, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning balance $ 25.5 $ 0.0
Write-offs (5.5) (0.6)
Recoveries (0.6) 0.0
Ending balance $ 0.0 $ 25.5