Organization and summary of significant accounting policies - Cash and Equivalents (Details) - USD ($) $ in Millions	Jan. 30, 2021	Feb. 01, 2020
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 1,172.5	$ 374.5
Cash and cash equivalents held in money markets and other accounts
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	1,122.2	326.2
Cash equivalents from third-party credit card issuers
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	48.8	46.3
Cash on hand
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 1.5	$ 2.0