Accounts receivable, net - Credit Quality of Finance Receivables (Details) $ in Millions	Jan. 30, 2021 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
Total at amortized cost	$ 97.5
Near Prime
Financing Receivable, Credit Quality Indicator [Line Items]
Total at amortized cost	46.6
Subprime
Financing Receivable, Credit Quality Indicator [Line Items]
Total at amortized cost	38.9
Deep Subprime
Financing Receivable, Credit Quality Indicator [Line Items]
Total at amortized cost	$ 12.0