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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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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the entity's investment in its wholly-owned subsidiaries. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-6 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-8 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-6 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-8 + Details
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- Definition The amount the liability recorded for the income tax examination increased or decreased in the current year/accounting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A + Details
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- Definition Amount of interest expense accrued for an underpayment of income taxes. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15 + Details
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