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Employee Retirement Plans - Assumptions (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2015
Minimum |  |  |  |
Assumptions used in determining net periodic pension cost for the plans |  |  |  |
Discount rates (as a percent) |  |  |  | 3.60%
Pension plan |  |  |  |
Assumptions used to determine the benefit obligation |  |  |  |
Discount rate (as a percent) |  |  | 3.60% |
Salaried Pension Plan |  |  |  |
Assumptions used in determining net periodic pension cost for the plans |  |  |  |
Rates of increase in compensation levels: Salaried (as a percent) |  |  | 3.50% |
Expected long-term rate of return on assets (as a percent) |  |  | 5.80% |
Hourly Pension Plan |  |  |  |
Assumptions used in determining net periodic pension cost for the plans |  |  |  |
Expected long-term rate of return on assets (as a percent) |  |  | 6.50% |
Assumptions used to determine the benefit obligation |  |  |  |
Discount rate (as a percent) |  |  | 4.20% |
Other postretirement benefit cost |  |  |  |
Assumptions used in determining net periodic pension cost for the plans |  |  |  |
Discount rates (as a percent) | 3.00% | 4.00% | 3.40% |
Summary of healthcare cost trend rates |  |  |  |
Ultimate healthcare cost trend rate (as a percent) | 4.50% | 4.50% | 4.50% |
Participation (as a percent) | 60.00% | 60.00% | 60.00% |
Assumed health care cost trend rate for the next fiscal year (as a percent) | 7.00% | 6.80% | 6.80% |
Ultimate rate in 2029 (as a percent) | 4.50% |  |  |
Ultimate rate in 2028 (as a percent) |  | 4.50% |  |
Ultimate rate in 2027 (as a percent) |  |  | 4.50% |
Assumptions used to determine the benefit obligation |  |  |  |
Discount rate (as a percent) | 2.10% | 3.00% |  |

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- Definition Represents the assumed number of participants for determining the health care cost trend rate. + References No definition available. + Details
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- Definition The ultimate trend rate for health care costs in the eight fiscal year following the latest fiscal year. + References No definition available. + Details
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- Definition The ultimate trend rate for health care costs in the ninth fiscal year following the latest fiscal year. + References No definition available. + Details
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- Definition The ultimate trend rate for health care costs in the seventh fiscal year following the latest fiscal year. + References No definition available. + Details
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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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- 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://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 Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status. + 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 (l) -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://fasb.org/us-gaap/role/ref/legacyRef -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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