Revenue recognition - Unamortized Deferred Selling Costs (Details) - USD ($) $ in Millions	Feb. 01, 2020	Feb. 02, 2019
Revenue from Contract with Customer [Abstract]
Other current assets	$ 23.6	$ 23.8
Other assets	80.0	75.4
Total deferred ESP selling costs	$ 103.6	$ 99.2

Amount of other miscellaneous assets expected to be realized or consumed after one year or normal operating cycle, if longer.

No definition available.

Name:	us-gaap_OtherAssetsMiscellaneousNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant