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Benefit Plans - Postretirement assumptions and trends (Details) - Postemployment Retirement Benefits | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Weighted average assumptions used to determine the company's obligations |  |  |
Discount rate (as a percent) | 3.69% | 4.18% |
Weighted average assumptions used to determine the company's net periodic benefit cost |  |  |
Discount rate (as a percent) | 4.42% | 5.49% | 4.93%
US |  |  |
Assumptions used in measuring benefit obligation |  |  |
2020 increase in per capita cost (as a percent) | 5.90% |  |
Ultimate trend (as a percent) | 4.50% |  |
Year ultimate trend reached | 2028 |  |
Canada |  |  |
Assumptions used in measuring benefit obligation |  |  |
2020 increase in per capita cost (as a percent) | 5.83% |  |
Ultimate trend (as a percent) | 4.00% |  |
Year ultimate trend reached | 2040 |  |
Brazil |  |  |
Assumptions used in measuring benefit obligation |  |  |
2020 increase in per capita cost (as a percent) | 7.07% |  |
Ultimate trend (as a percent) | 7.07% |  |
Year ultimate trend reached | 2020 |  |

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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://www.xbrl.org/2003/role/disclosureRef -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 for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 Ultimate trend rate for health care cost for defined benefit postretirement plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Year ultimate health care cost trend rate is expected to be reached, in CCYY format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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