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Pension Plans and Other Post-Retirement Benefits - Schedule of Actuarial Assumptions (Details) - year | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Canada | Domestic defined benefit plans |  |
To determine defined benefit obligation at end of year: |  |
Discount rate for pension plans | 360.00% | 3.40%
Rate of compensation increase | 300.00% | 3.10%
To determine net benefit expense for year: |  |
Discount rate for pension plans | 340.00% | 3.70%
Rate of compensation increase | 310.00% | 3.00%
Health care trend rates: |  |
Initial health care trend rate | 542.00% | 5.47%
Ultimate health care trend rate | 450.00% | 4.50%
Year ultimate health care trend rate reached | 2030 | 2030
Mortality rates: |  |
Average duration (in years) of pension obligation | 17.3 | 17.1
United Kingdom | Foreign defined benefit plans |  |
To determine defined benefit obligation at end of year: |  |
Discount rate for pension plans | 285.00% | 2.30%
Pension increases | 315.00% | 3.50%
To determine net benefit expense for year: |  |
Discount rate for pension plans | 230.00% | 2.55%
Pension increases | 350.00% | 3.55%
Mortality rates: |  |
Average duration (in years) of pension obligation | 16.9 | 19.0
United States | Foreign defined benefit plans |  |
To determine defined benefit obligation at end of year: |  |
Discount rate for pension plans | 440.00% | 3.70%
To determine net benefit expense for year: |  |
Discount rate for pension plans | 370.00% | 4.25%
Health care trend rates: |  |
Initial health care trend rate | 650.00% | 6.50%
Ultimate health care trend rate | 500.00% | 5.00%
Year ultimate health care trend rate reached | 2023 | 2023
Mortality rates: |  |
Average duration (in years) of pension obligation | 12.2 | 13.3
Bottom of range | Canada | Domestic defined benefit plans |  |
To determine defined benefit obligation at end of year: |  |
Pension increases | 0.00% | 0.00%
To determine net benefit expense for year: |  |
Pension increases | 0.00% | 0.00%
Top of range | Canada | Domestic defined benefit plans |  |
To determine defined benefit obligation at end of year: |  |
Pension increases | 0.15% | 0.15%
To determine net benefit expense for year: |  |
Pension increases | 0.15% | 0.15%
Male - Individuals currently at age 65 | Canada | Domestic defined benefit plans |  |
Mortality rates: |  |
Life expectancy (in years) for individuals | 23 | 22
Male - Individuals currently at age 65 | United Kingdom | Foreign defined benefit plans |  |
Mortality rates: |  |
Life expectancy (in years) for individuals | 24 | 24
Male - Individuals currently at age 65 | United States | Foreign defined benefit plans |  |
Mortality rates: |  |
Life expectancy (in years) for individuals | 23 | 23
Female - Individuals currently at age 65 | Canada | Domestic defined benefit plans |  |
Mortality rates: |  |
Life expectancy (in years) for individuals | 25 | 25
Female - Individuals currently at age 65 | United Kingdom | Foreign defined benefit plans |  |
Mortality rates: |  |
Life expectancy (in years) for individuals | 25 | 26
Female - Individuals currently at age 65 | United States | Foreign defined benefit plans |  |
Mortality rates: |  |
Life expectancy (in years) for individuals | 24 | 24
Male - At 65 for individuals currently at age 45 | Canada | Domestic defined benefit plans |  |
Mortality rates: |  |
Life expectancy (in years) for individuals | 24 | 24
Male - At 65 for individuals currently at age 45 | United Kingdom | Foreign defined benefit plans |  |
Mortality rates: |  |
Life expectancy (in years) for individuals | 25 | 26
Male - At 65 for individuals currently at age 45 | United States | Foreign defined benefit plans |  |
Mortality rates: |  |
Life expectancy (in years) for individuals | 24 | 24
Female - At 65 for individuals currently at age 45 | Canada | Domestic defined benefit plans |  |
Mortality rates: |  |
Life expectancy (in years) for individuals | 26 | 25
Female - At 65 for individuals currently at age 45 | United Kingdom | Foreign defined benefit plans |  |
Mortality rates: |  |
Life expectancy (in years) for individuals | 28 | 29
Female - At 65 for individuals currently at age 45 | United States | Foreign defined benefit plans |  |
Mortality rates: |  |
Life expectancy (in years) for individuals | 26 | 26

X
- 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 2017-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_144&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_144&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_144&doctype=Standard -URIDate 2017-03-09 + Details
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