Accumulated other comprehensive income (loss) - Reclassifications out of AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Feb. 01, 2025	Feb. 03, 2024	Jan. 28, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cost of sales	$ (4,078.2)	$ (4,345.7)	$ (4,790.0)
Other non-operating income (expense), net	3.7	(0.2)	(6.5)
Income before income taxes	124.2	639.8	451.2
Income taxes	(63.0)	170.6	(74.5)
Net income	61.2	810.4	376.7
Reclassification out of AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net income	0.1	(4.2)	110.1
Reclassification out of AOCI | (Gains) losses on cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income before income taxes	0.2	(0.5)	(1.7)
Income taxes	(0.1)	0.2	0.3
Net income	0.1	(0.3)	(1.4)
Reclassification out of AOCI | Accumulated defined benefit plans adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income before income taxes	0.0	0.2	137.5
Income taxes	0.0	(4.1)	(26.0)
Net income	0.0	(3.9)	111.5
Reclassification out of AOCI | Actuarial gains (losses)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other non-operating income (expense), net	0.0	0.0	3.5
Reclassification out of AOCI | Amortization of unrecognized net prior service costs
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other non-operating income (expense), net	0.0	0.0	0.3
Reclassification out of AOCI | Pension settlement loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other non-operating income (expense), net	0.0	0.2	133.7
Reclassification out of AOCI | Foreign currency contracts | (Gains) losses on cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cost of sales	$ 0.2	$ (0.5)	$ (1.7)