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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, 2020 | Dec. 31, 2019
--- | --- | ---
Pension defined benefit plans [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Total | $ 4,595.0 | $ 4,453.0
Retiree welfare plans [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Total | 606.0 | 598.0
U.S. plans [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Equity securities | 1.1 | 1.3
U.S. plans [Member] | Pension defined benefit plans [member] | Fair value measurements [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Other investments | 254.0 | 255.0
Total | $ 3,058.0 | $ 3,005.0
Percentage of fair value measurements |  | 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 | $ 2,175.0 | $ 2,155.0
Percentage of fair value measurements |  | 72.00%
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 | $ 17.0 | $ 32.0
Percentage of fair value measurements |  | 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 | $ 612.0 | $ 563.0
Percentage of fair value measurements |  | 19.00%
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] |  |
Percentage of fair value measurements |  | 8.00%
U.S. plans [Member] | Retiree welfare plans [Member] | Fair value measurements [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Other investments | $ 7.0 | $ 7.0
Total | $ 606.0 | $ 598.0
Percentage of fair value measurements |  | 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 | $ 520.0 | $ 511.0
Percentage of fair value measurements |  | 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 | $ 30.0 | $ 35.0
Percentage of fair value measurements |  | 6.00%
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 | $ 49.0 | $ 45.0
Percentage of fair value measurements |  | 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] |  |
Percentage of fair value measurements |  | 1.00%
Canadian plans [Member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Equity securities | $ 0.0 | $ 0.0
Canadian plans [Member] | Pension defined benefit plans [member] | Fair value measurements [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Other investments | 2.0 | 2.0
Total | $ 1,537.0 | $ 1,448.0
Percentage of fair value measurements |  | 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 | $ 1,186.0 | $ 1,123.0
Percentage of fair value measurements |  | 78.00%
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 | $ 10.0 | $ 12.0
Percentage of fair value measurements |  | 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 | $ 339.0 | $ 311.0
Percentage of fair value measurements |  | 21.00%
Canadian plans [Member] | Pension defined benefit plans [member] | Fair value measurements [member] | Other investments [member] |  |
Disclosure of fair value of plan assets [Line Items] |  |
Percentage of fair value measurements |  | 0.00%

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