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Income Taxes (Narrative) (Details) $ in Millions, $ in Millions |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 03, 2024 CAD ($) | Dec. 03, 2024 USD ($) | Jun. 30, 2025 | Jun. 30, 2025 | Feb. 01, 2025 CAD ($) | Feb. 01, 2025 USD ($) | Dec. 03, 2024 USD ($)
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |
Effective income tax rate |  |  | 24.60% | 22.70% |  |  |
Federal and provincial income tax estimated, exclusive of interest and penalties | $ 79.1 | $ 58.1 |  |  |  |  |
Accrued income taxes | 37.7 |  |  |  |  |  | $ 27.7
Interest and penalties accrued from income tax examination | $ 41.4 |  |  |  |  |  | $ 30.4
Deposit paid |  |  |  |  | $ 39.5 | $ 29.0 |

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