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Postretirement Benefit Plans - Weighted Average Assumptions Used (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
U.S. | Defined benefit plan |  |
Weighted average assumptions used to determine benefit obligations: |  |
Discount rate (in percent) | 2.81% | 3.62%
Long-term pay progression (in percent) | 3.70% | 3.30%
Weighted average assumptions used to determine net periodic benefit cost: |  |
Discount rate (in percent) | 3.42% | 4.35%
Long term rate of return on plan assets (in percent) | 4.00% | 4.90%
Long-term pay progression (in percent) | 3.30% | 3.30%
U.S. | Retiree health care plan |  |
Weighted average assumptions used to determine benefit obligations: |  |
Discount rate (in percent) | 2.74% | 3.63%
Weighted average assumptions used to determine net periodic benefit cost: |  |
Discount rate (in percent) | 3.63% | 4.30%
Long term rate of return on plan assets (in percent) | 3.50% | 4.40%
Non-U.S. | Defined benefit plan |  |
Weighted average assumptions used to determine benefit obligations: |  |
Discount rate (in percent) | 1.31% | 1.46%
Long-term pay progression (in percent) | 3.15% | 3.06%
Weighted average assumptions used to determine net periodic benefit cost: |  |
Discount rate (in percent) | 1.46% | 1.85%
Long term rate of return on plan assets (in percent) | 2.93% | 3.62%
Long-term pay progression (in percent) | 3.06% | 3.03%

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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 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://www.xbrl.org/2003/role/disclosureRef -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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- 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 Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, 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)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2919-114920 + Details
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- Definition Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related 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)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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