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Pension Plans and Other Post-Retirement Benefits - Schedule of Actuarial Assumptions (Details) - year | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Canada |  |
To determine defined benefit obligation at end of year: |  |
Discount rate for pension plans | 3.00% | 2.70%
Rate of compensation increase | 2.80% | 2.80%
To determine net benefit expense for year: |  |
Discount rate for pension plans | 2.70% | 3.00%
Rate of compensation increase | 2.80% | 3.00%
Health care trend rates: |  |
Initial health care trend rate | 5.10% | 5.30%
Ultimate health care trend rate | 4.00% | 4.00%
Year ultimate health care trend rate reached | 2040 | 2040
Mortality rates: |  |
Average duration (in years) of pension obligation | 16 years 10 months 24 days | 17 years 2 months 12 days
United Kingdom |  |
To determine defined benefit obligation at end of year: |  |
Discount rate for pension plans | 1.90% | 1.30%
Pension increases | 3.30% | 2.95%
To determine net benefit expense for year: |  |
Discount rate for pension plans | 1.30% | 2.00%
Pension increases | 2.95% | 2.95%
Mortality rates: |  |
Average duration (in years) of pension obligation | 17 years 4 months 24 days | 17 years 8 months 12 days
United States |  |
To determine defined benefit obligation at end of year: |  |
Discount rate for pension plans | 3.00% | 2.65%
To determine net benefit expense for year: |  |
Discount rate for pension plans | 2.65% | 3.45%
Health care trend rates: |  |
Initial health care trend rate | 7.00% | 6.50%
Ultimate health care trend rate | 5.00% | 5.00%
Year ultimate health care trend rate reached | 2025 | 2025
Mortality rates: |  |
Average duration (in years) of pension obligation | 12 years 2 months 12 days | 12 years 8 months 12 days
Bottom of range | Canada |  |
To determine defined benefit obligation at end of year: |  |
Pension increases | 0.00% |
To determine net benefit expense for year: |  |
Pension increases | 0.00% | 0.00%
Top of range | Canada |  |
To determine defined benefit obligation at end of year: |  |
Pension increases | 0.05% |
To determine net benefit expense for year: |  |
Pension increases | 0.05% | 0.015%
Male - Individuals currently at age 65 | Canada |  |
Mortality rates: |  |
Life expectancy (in years) for individuals | 23 | 23
Male - Individuals currently at age 65 | United Kingdom |  |
Mortality rates: |  |
Life expectancy (in years) for individuals | 23 | 23
Male - Individuals currently at age 65 | United States |  |
Mortality rates: |  |
Life expectancy (in years) for individuals | 22 | 22
Female - Individuals currently at age 65 | Canada |  |
Mortality rates: |  |
Life expectancy (in years) for individuals | 25 | 25
Female - Individuals currently at age 65 | United Kingdom |  |
Mortality rates: |  |
Life expectancy (in years) for individuals | 25 | 25
Female - Individuals currently at age 65 | United States |  |
Mortality rates: |  |
Life expectancy (in years) for individuals | 23 | 23
Male - At 65 for individuals currently at age 45 | Canada |  |
Mortality rates: |  |
Life expectancy (in years) for individuals | 24 | 24
Male - At 65 for individuals currently at age 45 | United Kingdom |  |
Mortality rates: |  |
Life expectancy (in years) for individuals | 24 | 25
Male - At 65 for individuals currently at age 45 | United States |  |
Mortality rates: |  |
Life expectancy (in years) for individuals | 23 | 23
Female - At 65 for individuals currently at age 45 | Canada |  |
Mortality rates: |  |
Life expectancy (in years) for individuals | 26 | 26
Female - At 65 for individuals currently at age 45 | United Kingdom |  |
Mortality rates: |  |
Life expectancy (in years) for individuals | 27 | 27
Female - At 65 for individuals currently at age 45 | United States |  |
Mortality rates: |  |
Life expectancy (in years) for individuals | 25 | 25

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- Definition The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_144&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The expected rate of increases in pension that is used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_144&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_144&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 147 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_147_c&doctype=Standard -URIDate 2021-03-24 + Details
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