Accumulated other comprehensive income (loss) - Changes in Accumulated OCI by Component and Reclassifications Out of Accumulated OCI (Details) - USD ($) $ in Millions	12 Months Ended
Feb. 01, 2025	Feb. 03, 2024	Jan. 28, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	$ 2,166.5	$ 1,578.6	$ 1,564.0
OCI before reclassifications	(12.3)	3.1	(23.4)
Amounts reclassified from AOCI to earnings	0.1	(4.2)	110.1
Net current period OCI	(12.2)	(1.1)	86.7
Balance	1,851.8	2,166.5	1,578.6
Accumulated other comprehensive loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(265.3)	(264.2)	(350.9)
Balance	(277.5)	(265.3)	(264.2)
Foreign currency translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(265.2)	(268.4)	(244.3)
OCI before reclassifications	(12.5)	3.2	(24.1)
Amounts reclassified from AOCI to earnings	0.0	0.0	0.0
Net current period OCI	(12.5)	3.2	(24.1)
Balance	(277.7)	(265.2)	(268.4)
Gain (losses) on available-for-sale securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(0.2)	(0.2)	0.2
OCI before reclassifications	0.0	0.0	(0.4)
Amounts reclassified from AOCI to earnings	0.0	0.0	0.0
Net current period OCI	0.0	0.0	(0.4)
Balance	(0.2)	(0.2)	(0.2)
Gains (losses) on cash flow hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	0.1	0.5	0.4
OCI before reclassifications	0.2	(0.1)	1.5
Amounts reclassified from AOCI to earnings	0.1	(0.3)	(1.4)
Net current period OCI	0.3	(0.4)	0.1
Balance	0.4	0.1	0.5
Pension plan \| Actuarial gains (losses)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	0.0	3.9	(103.3)
OCI before reclassifications	0.0	0.0	(0.4)
Amounts reclassified from AOCI to earnings	0.0	(3.9)	107.6
Net current period OCI	0.0	(3.9)	107.2
Balance	0.0	0.0	3.9
Pension plan \| Amortization of unrecognized net prior service costs
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	0.0	0.0	(3.9)
OCI before reclassifications	0.0	0.0	0.0
Amounts reclassified from AOCI to earnings	0.0	0.0	3.9
Net current period OCI	0.0	0.0	3.9
Balance	$ 0.0	$ 0.0	$ 0.0

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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