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Income taxes - Narrative (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Aug. 02, 2025 | Aug. 03, 2024
Effective Income Tax Rate Reconciliation [Line Items] |  |
Goodwill impairment | $ 53.6 | $ 123.0
Excess tax benefit from share based compensation | $ 0.7 | 5.0
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount |  | $ 166.0
BERMUDA |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 15.00% |

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