Segment information - Summary of Activity by Segment (Details) - USD ($) $ in Millions	3 Months Ended
	May 02, 2020	May 04, 2019
Segment Reporting Information [Line Items]
Sales	$ 852.1	$ 1,431.7
Operating income (loss)	(299.6)	(2.6)
Interest expense, net	(7.1)	(9.2)
Other non-operating income, net	0.1	0.3
Income (loss) before income taxes	(306.6)	(11.5)
Inventory write-down	0.4	0.0
Asset impairments	136.3	0.0
North America
Segment Reporting Information [Line Items]
Sales	781.1	1,300.3
Operating income (loss)	(234.2)	48.1
Inventory write-down	(0.4)	(0.5)
Severance costs	8.9
Asset impairments	117.9
International
Segment Reporting Information [Line Items]
Sales	64.9	111.5
Operating income (loss)	(38.6)	(8.0)
Severance costs	3.6
Asset impairments	18.4
Other
Segment Reporting Information [Line Items]
Sales	6.1	19.9
Operating income (loss)	(26.8)	(42.7)
Severance costs	0.2	$ 27.3
Gain (loss) related to litigation settlement	$ (8.5)