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Employee Future Benefits - Major Categories of Plan Assets and Actual Percent Allocation (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Pension plans |  |
Disclosure of fair value of plan assets [Line Items] |  |
Total | $ 3,820.0 | $ 3,706.0
Retiree welfare plans |  |
Disclosure of fair value of plan assets [Line Items] |  |
Total | 553.0 | 526.0
U.S. plans |  |
Disclosure of fair value of plan assets [Line Items] |  |
Public equity securities | $ 2.1 | $ 1.4
Percentage of plan assets | 16.00% | 16.00%
U.S. plans | Pension plans |  |
Disclosure of fair value of plan assets [Line Items] |  |
Total | $ 2,635.0 | $ 2,521.0
Percentage of fair value measurements | 100.00% | 100.00%
U.S. plans | Pension plans | Cash and cash equivalents |  |
Disclosure of fair value of plan assets [Line Items] |  |
Cash and cash equivalents | $ 35.0 | $ 28.0
Percentage of fair value measurements | 1.00% | 1.00%
U.S. plans | Pension plans | Public equities |  |
Disclosure of fair value of plan assets [Line Items] |  |
Public equity securities | $ 346.0 | $ 315.0
Percentage of fair value measurements | 14.00% | 13.00%
U.S. plans | Pension plans | Debt securities |  |
Disclosure of fair value of plan assets [Line Items] |  |
Public debt securities | $ 1,513.0 | $ 1,437.0
Percentage of fair value measurements | 57.00% | 57.00%
U.S. plans | Pension plans | Other invested assets |  |
Disclosure of fair value of plan assets [Line Items] |  |
Other investments | $ 741.0 | $ 741.0
Percentage of fair value measurements | 28.00% | 29.00%
U.S. plans | Retiree welfare plans |  |
Disclosure of fair value of plan assets [Line Items] |  |
Total | $ 553.0 | $ 526.0
Percentage of fair value measurements | 100.00% | 100.00%
U.S. plans | Retiree welfare plans | Cash and cash equivalents |  |
Disclosure of fair value of plan assets [Line Items] |  |
Cash and cash equivalents | $ 23.0 | $ 25.0
Percentage of fair value measurements | 4.00% | 5.00%
U.S. plans | Retiree welfare plans | Public equities |  |
Disclosure of fair value of plan assets [Line Items] |  |
Public equity securities | $ 41.0 | $ 39.0
Percentage of fair value measurements | 7.00% | 7.00%
U.S. plans | Retiree welfare plans | Debt securities |  |
Disclosure of fair value of plan assets [Line Items] |  |
Public debt securities | $ 476.0 | $ 448.0
Percentage of fair value measurements | 87.00% | 85.00%
U.S. plans | Retiree welfare plans | Other invested assets |  |
Disclosure of fair value of plan assets [Line Items] |  |
Other investments | $ 13.0 | $ 14.0
Percentage of fair value measurements | 2.00% | 3.00%
Canadian plans |  |
Disclosure of fair value of plan assets [Line Items] |  |
Percentage of plan assets | 0.10% | 0.10%
Canadian plans | Pension plans |  |
Disclosure of fair value of plan assets [Line Items] |  |
Total | $ 1,185.0 | $ 1,185.0
Percentage of fair value measurements | 100.00% | 100.00%
Canadian plans | Pension plans | Cash and cash equivalents |  |
Disclosure of fair value of plan assets [Line Items] |  |
Cash and cash equivalents | $ 11.0 | $ 15.0
Percentage of fair value measurements | 1.00% | 1.00%
Canadian plans | Pension plans | Public equities |  |
Disclosure of fair value of plan assets [Line Items] |  |
Public equity securities | $ 205.0 | $ 195.0
Percentage of fair value measurements | 17.00% | 17.00%
Canadian plans | Pension plans | Debt securities |  |
Disclosure of fair value of plan assets [Line Items] |  |
Public debt securities | $ 968.0 | $ 974.0
Percentage of fair value measurements | 82.00% | 82.00%
Canadian plans | Pension plans | Other invested assets |  |
Disclosure of fair value of plan assets [Line Items] |  |
Other investments | $ 1.0 | $ 1.0
Percentage of fair value measurements | 0.00% | 0.00%
Canadian plans | Retiree welfare plans |  |
Disclosure of fair value of plan assets [Line Items] |  |
Total | $ 0.0 | $ 0.0
Percentage of fair value measurements | 0.00% | 0.00%
Canadian plans | Retiree welfare plans | Cash and cash equivalents |  |
Disclosure of fair value of plan assets [Line Items] |  |
Cash and cash equivalents | $ 0.0 | $ 0.0
Percentage of fair value measurements | 0.00% | 0.00%
Canadian plans | Retiree welfare plans | Public equities |  |
Disclosure of fair value of plan assets [Line Items] |  |
Public equity securities | $ 0.0 | $ 0.0
Percentage of fair value measurements | 0.00% | 0.00%
Canadian plans | Retiree welfare plans | Debt securities |  |
Disclosure of fair value of plan assets [Line Items] |  |
Public debt securities | $ 0.0 | $ 0.0
Percentage of fair value measurements | 0.00% | 0.00%
Canadian plans | Retiree welfare plans | Other invested assets |  |
Disclosure of fair value of plan assets [Line Items] |  |
Other investments | $ 0.0 | $ 0.0
Percentage of fair value measurements | 0.00% | 0.00%

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