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Pension and Other Postretirement Benefits - Weighted average assumptions (Details) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Weighted average assumptions used to determine net cost for years ended December 31 |  |  |
Expected long-term rate of return on plan assets | 5.01% |  |
Pension Benefits |  |  |
Weighted average assumptions used to determine benefit obligations at December 31 |  |  |
Discount rate | 3.24% | 4.25% |
Rate of compensation increase | 3.97% | 4.00% |
Weighted average assumptions used to determine net cost for years ended December 31 |  |  |
Discount rate | 4.25% | 3.62% | 4.17%
Expected long-term rate of return on plan assets | 5.84% | 5.77% | 5.77%
Rate of compensation increase | 4.00% | 4.01% | 4.02%
Postretirement Benefits |  |  |
Weighted average assumptions used to determine benefit obligations at December 31 |  |  |
Discount rate | 3.12% | 4.27% |
Weighted average assumptions used to determine net cost for years ended December 31 |  |  |
Discount rate | 4.27% | 3.61% | 4.08%

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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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- 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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