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Income taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2026	Feb. 03, 2024	Jan. 28, 2023	Jan. 29, 2022	Jan. 30, 2021
Operating Loss Carryforwards [Line Items]
Statutory tax rate (percent)		21.00%	21.00%	21.00%
Deferred Tax Assets, Bermuda economic transition adjustment		$ 263.3	$ 0.0
Income tax examination, increase (decrease) in liability from prior year		(20.5)	20.5
Other Tax Expense (Benefit)		13.5
Net operating losses		66.0	65.9
Value of capital losses		11.5	13.2
Decrease in valuation allowance		(0.7)
Unrecognized tax benefits		26.0	85.9	$ 24.9	$ 25.4
Accrued interest related to unrecognized tax benefits		12.0
Accrued penalties		0.5
Increase resulting from settlements with taxing authorities		35.6
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Net operating losses		36.3
Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]
Net operating losses		25.1
Foreign Tax Authority
Operating Loss Carryforwards [Line Items]
Net operating losses		29.7
Value of capital losses		$ 11.5	$ 13.2
Bermuda
Operating Loss Carryforwards [Line Items]
Statutory tax rate (percent)		0.00%
Bermuda | Subsequent Event
Operating Loss Carryforwards [Line Items]
Statutory tax rate (percent)	15.00%

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The amount the liability recorded for the income tax examination increased or decreased in the current year/accounting period.

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