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Accounts receivable - Portfolio of Accounts Receivable (Details) - USD ($)
$ in Millions
Nov. 02, 2019
Feb. 02, 2019
Nov. 03, 2018
Receivables [Abstract]      
Accounts receivable, held for investment $ 16.4 $ 19.5 $ 9.3
Accounts receivable, held for sale 4.4 4.2 4.8
Accounts receivable $ 20.8 $ 23.7 $ 14.1