Segment information - Summary of Activity by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 30, 2021	Feb. 01, 2020	Feb. 02, 2019
Segment Reporting Information [Line Items]
Total sales	$ 5,226.9	$ 6,137.1	$ 6,247.1
Operating income (loss)	(57.7)	158.3	(764.6)
Interest expense, net	(32.0)	(35.6)	(39.7)
Other non-operating income, net	0.0	7.0	1.7
Income (loss) before income taxes	(89.7)	129.7	(802.6)
Depreciation and amortization	176.0	178.0	183.6
Capital additions	83.0	136.3	133.5
Asset impairment charges	159.0	47.7	735.4
Restructuring benefit due to change in inventory reserves	(1.4)	(9.2)	(62.2)
Gain (loss) related to litigation settlement	(7.5)	(33.2)	0.0
Total assets	6,178.9	6,299.1
Total long-lived assets	1,022.5	1,254.5
Corporate and unallocated
Segment Reporting Information [Line Items]
Operating income (loss)	(72.0)	(119.7)	(91.3)
Severance costs	0.5	20.8	10.3
Gain (loss) on sale of receivable			(7.0)
Gain (loss) related to litigation settlement	(7.5)	(33.2)	(11.0)
Total assets	517.9	421.2
North America
Segment Reporting Information [Line Items]
Total sales	4,840.9	5,565.8	5,641.7
North America | Operating Segments
Segment Reporting Information [Line Items]
Total sales	4,840.9	5,565.8	5,641.7
Operating income (loss)	57.9	284.9	(666.0)
Depreciation and amortization	163.7	159.9	165.8
Capital additions	79.0	128.3	123.9
Inventory charges	1.6	6.0	52.7
Severance costs	36.0	42.1	44.9
Asset impairment charges	136.7	47.7	731.8
Gain (loss) on sale of receivable			(160.4)
Total assets	5,101.9	5,240.2
Total long-lived assets	978.1	1,196.7
North America | Canada | Operating Segments
Segment Reporting Information [Line Items]
Total sales	150.9	204.6	218.3
International
Segment Reporting Information [Line Items]
Total sales	355.9	518.0	576.5
International | Operating Segments
Segment Reporting Information [Line Items]
Total sales	355.9	518.0	576.5
Operating income (loss)	(43.3)	9.0	4.4
Depreciation and amortization	12.0	17.8	17.5
Capital additions	4.0	8.0	9.6
Inventory charges			3.8
Severance costs	9.7	7.0	8.5
Asset impairment charges	22.3
Total assets	514.2	546.4
Total long-lived assets	41.6	54.6
Other
Segment Reporting Information [Line Items]
Total sales	30.1	53.3	28.9
Other | Operating Segments
Segment Reporting Information [Line Items]
Total sales	30.1	53.3	28.9
Operating income (loss)	(0.3)	(15.9)	(11.7)
Depreciation and amortization	0.3	0.3	0.3
Capital additions	0.0	0.0	0.0
Inventory charges		3.2	5.7
Asset impairment charges			$ 3.6
Restructuring benefit due to change in inventory reserves	0.2
Total assets	44.9	91.3
Total long-lived assets	$ 2.8	$ 3.2