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Income taxes - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024
Effective Income Tax Rate Reconciliation [Line Items] |  |
Proceeds from income tax refunds | $ 0.3 | $ 0.1
Asset Management |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |
Effective income tax rate reconciliation (as a percent) | 21.00% | 26.50%
Asset Management | United States |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |
Effective income tax rate reconciliation (as a percent) | 21.00% | 21.00%
Asset Management | Canada |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |
Effective income tax rate reconciliation (as a percent) | 26.50% | 26.50%

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