Accounts receivable, net - Past Due Status (Details) - USD ($) $ in Millions	Jan. 30, 2021	Oct. 31, 2020
Financing Receivable, Past Due [Line Items]
Total at amortized cost	$ 97.5	$ 54.2
Current
Financing Receivable, Past Due [Line Items]
Total at amortized cost	81.3	47.6
1 - 30 days past due
Financing Receivable, Past Due [Line Items]
Total at amortized cost	9.1	4.0
31 - 60 days past due
Financing Receivable, Past Due [Line Items]
Total at amortized cost	2.6	1.5
61 - 90 days past due
Financing Receivable, Past Due [Line Items]
Total at amortized cost	1.7	0.7
Greater than 90 days past due
Financing Receivable, Past Due [Line Items]
Total at amortized cost	$ 2.8	$ 0.4