Accumulated other comprehensive income (loss) - Reclassifications out of AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 29, 2022	Jan. 30, 2021	Feb. 01, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cost of sales	$ (4,702.0)	$ (3,493.0)	$ (3,904.2)
Other operating income (loss)	8.5	2.4	(29.6)
Interest expense, net	(16.9)	(32.0)	(35.6)
Other non-operating (loss) income	(2.1)	0.0	7.0
Income taxes	(114.5)	74.5	(24.2)
Net income (loss)	769.9	(15.2)	105.5
Reclassification out of AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net income (loss)	2.6	(11.7)	(0.7)
Reclassification out of AOCI | Gains (losses) on cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total before income tax	1.0	(16.8)	(3.4)
Income taxes	(0.3)	4.2	0.7
Net income (loss)	0.7	(12.6)	(2.7)
Reclassification out of AOCI | Accumulated defined benefit plans adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total before income tax	2.2	1.1	1.2
Income taxes	(0.3)	(0.2)	(0.2)
Net income (loss)	1.9	0.9	1.0
Reclassification out of AOCI | Actuarial gains (losses)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other non-operating (loss) income	2.1	1.0	1.2
Reclassification out of AOCI | Prior service credits (costs)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other non-operating (loss) income	0.1	0.1	0.0
Reclassification out of AOCI | Available-for-sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other operating income (loss)	0.0	0.0	1.0
Income taxes	0.0	0.0	0.0
Net income (loss)	0.0	0.0	1.0
Reclassification out of AOCI | Foreign currency contracts | Gains (losses) on cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cost of sales	0.6	0.0	(1.1)
Other operating income (loss)	0.0	(0.6)	0.0
Reclassification out of AOCI | Interest rate swaps | Gains (losses) on cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest expense, net	0.0	0.0	(0.6)
Reclassification out of AOCI | Commodity contracts | Gains (losses) on cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cost of sales	0.4	(6.9)	(1.7)
Other operating income (loss)	$ 0.0	$ (9.3)	$ 0.0