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Accounts receivable - Portfolio of Accounts Receivable (Details) - USD ($)
$ in Millions
Aug. 03, 2019
Feb. 02, 2019
Aug. 04, 2018
Receivables [Abstract]      
Accounts receivable, held for investment $ 16.3 $ 19.5 $ 6.5
Accounts receivable, held for sale 5.5 4.2 4.6
Accounts receivable $ 21.8 $ 23.7 $ 11.1