Accumulated other comprehensive income (loss) - Reclassifications out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jul. 29, 2023	Apr. 29, 2023	Jul. 30, 2022	Apr. 30, 2022	Jul. 29, 2023	Jul. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cost of sales	$ (1,002.8)		$ (1,090.2)		$ (2,038.8)	$ (2,204.8)
Income taxes	(17.2)		(35.6)		(26.7)	19.6
Other non-operating income (expense), net	0.3		(1.5)		0.1	(4.1)
Net income	75.1	$ 97.4	145.4	$ (83.5)	172.5	61.9
Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net income	(0.2)		1.6		(4.5)	109.3
Reclassification out of Accumulated Other Comprehensive Income | Gains on cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total before income tax	(0.3)		(0.3)		(0.8)	(0.3)
Income taxes	0.1		0.0		0.2	0.0
Net income	(0.2)		(0.3)		(0.6)	(0.3)
Reclassification out of Accumulated Other Comprehensive Income | Defined benefit pension plan items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total before income tax	0.0		2.1		0.2	135.0
Income taxes	0.0		(0.2)		(4.1)	(25.4)
Net income	0.0		1.9		(3.9)	109.6
Reclassification out of Accumulated Other Comprehensive Income | Amortization of unrecognized actuarial losses
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other non-operating income (expense), net	0.0		1.1		0.0	2.0
Reclassification out of Accumulated Other Comprehensive Income | Amortization of unrecognized net prior service costs
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other non-operating income (expense), net	0.0		0.1		0.0	0.2
Reclassification out of Accumulated Other Comprehensive Income | Pension settlement loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other non-operating income (expense), net	0.0		0.9		0.2	132.8
Reclassification out of Accumulated Other Comprehensive Income | Foreign currency contracts | Gains on cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cost of sales	$ (0.3)		$ (0.3)		$ (0.8)	$ (0.3)