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Benefit Plans - Weighted average assumptions used (Details) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Pension benefits |  |  |
Weighted average assumptions used to determine net pension cost and net postretirement benefit cost |  |  |
Discount rate | 3.70% | 4.06% | 3.96%
Expected long-term rate of return on plan assets | 7.34% | 7.33% | 7.32%
Weighted average assumptions used to determine benefit obligations |  |  |
Discount rate | 3.31% | 4.31% |
Postretirement benefits |  |  |
Weighted average assumptions used to determine net pension cost and net postretirement benefit cost |  |  |
Discount rate | 3.61% | 3.95% | 3.91%
Weighted average assumptions used to determine benefit obligations |  |  |
Discount rate | 3.27% | 4.22% |

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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 for present value of future retirement benefits cash flows, 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)(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://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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