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Employee Benefit Obligations - Other Postretirement Weighted Average Assumptions (Details) - Other post retirement benefits | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
US Plan |  |  |
Weighted-average assumptions used to determine benefit obligations |  |  |
Discount rate (as a percent) | 3.24% | 4.35% | 3.64%
Rate of compensation increase (as a percent) | 4.50% | 4.50% | 4.50%
Weighted-average assumptions used to determine net periodic benefit cost |  |  |
Discount rate (as a percent) | 4.35% | 3.64% | 4.16%
Rate of compensation increase (as a percent) | 4.50% | 4.50% | 4.50%
Canada |  |  |
Weighted-average assumptions used to determine benefit obligations |  |  |
Discount rate (as a percent) | 3.00% | 3.50% | 3.25%
Weighted-average assumptions used to determine net periodic benefit cost |  |  |
Discount rate (as a percent) | 3.50% | 3.25% | 3.50%

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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