Accounts receivable, net - Credit Quality of Finance Receivables (Details) - USD ($) $ in Millions	Jan. 30, 2021	Oct. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Total at amortized cost	$ 97.5	$ 54.2
Near Prime
Financing Receivable, Credit Quality Indicator [Line Items]
Total at amortized cost	46.6	26.4
Subprime
Financing Receivable, Credit Quality Indicator [Line Items]
Total at amortized cost	38.9	21.8
Deep Subprime
Financing Receivable, Credit Quality Indicator [Line Items]
Total at amortized cost	$ 12.0	$ 6.0