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Pension and Non-pension Post-employment Benefit Plans - Percentages and Assumptions Used in Measuring the Plans (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Pension Plan |  |  |
Weighted average discount rate at December 31 (i) for: |  |  |
Benefit obligations | 1.40% | 2.10% | 2.90%
Net pension cost | 2.10% | 2.90% | 2.50%
Weighted average rate of compensation increase for: |  |  |
Benefit obligations | 1.10% | 3.80% | 4.10%
Net pension cost | 3.80% | 4.10% | 4.00%
Pension Plan | Discount rate |  |  |
Healthcare cost trend rates: |  |  |
1% Increase | $ (62.4) |  |
1% Decrease | 81.7 |  |
Pension Plan | Healthcare cost trend rate |  |  |
Healthcare cost trend rates: |  |  |
1% Increase | 0.0 |  |
1% Decrease | $ 0.0 |  |
Other benefit plans |  |  |
Weighted average discount rate at December 31 (i) for: |  |  |
Benefit obligations | 2.50% | 2.90% | 3.80%
Net pension cost | 2.90% | 3.80% | 3.60%
Weighted average rate of compensation increase for: |  |  |
Benefit obligations | 4.60% | 4.60% | 4.20%
Net pension cost | 4.60% | 4.20% | 4.60%
Healthcare cost trend rates: |  |  |
Immediate trend | 5.30% | 5.30% | 5.70%
Ultimate trend | 4.00% | 4.00% | 4.00%
Other benefit plans | Discount rate |  |  |
Healthcare cost trend rates: |  |  |
1% Increase | $ (11.3) |  |
1% Decrease | 13.9 |  |
Other benefit plans | Healthcare cost trend rate |  |  |
Healthcare cost trend rates: |  |  |
1% Increase | 8.1 |  |
1% Decrease | $ (6.6) |  |

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- Definition Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase + References No definition available. + Details
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- Definition Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year + References No definition available. + Details
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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 2020-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_144&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_145_a&doctype=Standard -URIDate 2020-01-01 + Details
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