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Employee Future Benefits - Summary of Major Categories of Plan Assets and Actual Per Cent Allocation to Each Category (Detail) - CAD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Pension defined benefit plans [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Total | $ 3,706.0 | $ 3,722.0
Retiree welfare plans [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Total | 526.0 | 523.0
U.S. plans [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Equity securities | 1.4 | 1.2
U.S. plans [Member] | Pension defined benefit plans [member] | Fair value measurements [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Total | $ 2,521.0 | $ 2,581.0
Percentage of fair value measurements | 100.00% | 100.00%
U.S. plans [Member] | Pension defined benefit plans [member] | Fair value measurements [member] | Debt securities [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Debt securities | $ 1,437.0 | $ 1,509.0
Percentage of fair value measurements | 57.00% | 58.00%
U.S. plans [Member] | Pension defined benefit plans [member] | Fair value measurements [member] | Cash and cash equivalents [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Cash and cash equivalents | $ 28.0 | $ 35.0
Percentage of fair value measurements | 1.00% | 1.00%
U.S. plans [Member] | Pension defined benefit plans [member] | Fair value measurements [member] | Equity securities [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Equity securities | $ 315.0 | $ 377.0
Percentage of fair value measurements | 13.00% | 15.00%
U.S. plans [Member] | Pension defined benefit plans [member] | Fair value measurements [member] | Other investments [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Other investments | $ 741.0 | $ 660.0
Percentage of fair value measurements | 29.00% | 26.00%
U.S. plans [Member] | Retiree welfare plans [Member] | Fair value measurements [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Total | $ 526.0 | $ 523.0
Percentage of fair value measurements | 100.00% | 100.00%
U.S. plans [Member] | Retiree welfare plans [Member] | Fair value measurements [member] | Debt securities [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Debt securities | $ 448.0 | $ 445.0
Percentage of fair value measurements | 85.00% | 85.00%
U.S. plans [Member] | Retiree welfare plans [Member] | Fair value measurements [member] | Cash and cash equivalents [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Cash and cash equivalents | $ 25.0 | $ 22.0
Percentage of fair value measurements | 5.00% | 4.00%
U.S. plans [Member] | Retiree welfare plans [Member] | Fair value measurements [member] | Equity securities [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Equity securities | $ 39.0 | $ 41.0
Percentage of fair value measurements | 7.00% | 8.00%
U.S. plans [Member] | Retiree welfare plans [Member] | Fair value measurements [member] | Other investments [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Other investments | $ 14.0 | $ 15.0
Percentage of fair value measurements | 3.00% | 3.00%
Canadian plans [Member] | Pension defined benefit plans [member] | Fair value measurements [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Total | $ 1,185.0 | $ 1,141.0
Percentage of fair value measurements | 100.00% | 100.00%
Canadian plans [Member] | Pension defined benefit plans [member] | Fair value measurements [member] | Debt securities [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Debt securities | $ 974.0 | $ 898.0
Percentage of fair value measurements | 82.00% | 79.00%
Canadian plans [Member] | Pension defined benefit plans [member] | Fair value measurements [member] | Cash and cash equivalents [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Cash and cash equivalents | $ 15.0 | $ 9.0
Percentage of fair value measurements | 1.00% | 1.00%
Canadian plans [Member] | Pension defined benefit plans [member] | Fair value measurements [member] | Equity securities [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Equity securities | $ 195.0 | $ 233.0
Percentage of fair value measurements | 17.00% | 20.00%
Canadian plans [Member] | Pension defined benefit plans [member] | Fair value measurements [member] | Other investments [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Other investments | $ 1.0 | $ 1.0
Percentage of fair value measurements | 0.00% | 0.00%

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