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Pension and Other Postretirement Benefits - U.S. defined benefit plan (Details) | 12 Months Ended |
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Dec. 31, 2019 | Dec. 31, 2018
Pension and Other Postretirement Benefits |  |
Future expected blended long-term rate of return on plan assets (as a percent) | 5.01% |
Minimum | U.S. Defined Benefit Plan | Return-seeking investment |  |
Pension and Other Postretirement Benefits |  |
Asset allocation (as a percent) | 57.00% | 50.00%
Minimum | U.S. Defined Benefit Plan | Liability-hedging investment |  |
Pension and Other Postretirement Benefits |  |
Asset allocation (as a percent) | 28.00% | 24.00%
Maximum | U.S. Defined Benefit Plan | Return-seeking investment |  |
Pension and Other Postretirement Benefits |  |
Asset allocation (as a percent) | 72.00% | 76.00%
Maximum | U.S. Defined Benefit Plan | Liability-hedging investment |  |
Pension and Other Postretirement Benefits |  |
Asset allocation (as a percent) | 43.00% | 50.00%

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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://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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