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Employee Benefit Plans and Other Postretirement Benefits - Additional Information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Retirement age threshold |  | 55 years |  |
Postretirement benefits eligibility, years of service requirement |  | 10 years |  |
Period over which asset gain (losses) are amortized |  | 5 years |  |
Company contributions |  | $ 21,900,000 | $ 20,100,000 | $ 19,000,000.0
Pension and SERPA Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Accumulated benefit obligation |  | $ 2,120,000,000 | $ 1,900,000,000 |
Expected return on plan assets |  | 7.10% | 7.25% | 7.25%
Pension Plan Assets |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Investment in company common stock - shares |  | 1,273,592 | 1,273,592 |
Investment in company common stock - value |  | $ 47,400,000 | $ 43,500,000 |
Company contributions |  | $ 0 |  |
Pension Plan Assets | Scenario, Forecast |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Expected return on plan assets | 6.70% |  |  |
Pension Plan Assets | Equity Securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target plan asset allocation |  | 56.00% |  |
Pension Plan Assets | Fixed Income Securities and Cash and Cash Equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target plan asset allocation |  | 44.00% |  |
Postretirement Health Coverage |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Expected return on plan assets |  | 7.25% | 7.25% | 7.25%
Company contributions |  | $ 0 |  |
Postretirement Health Coverage | Scenario, Forecast |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Expected return on plan assets | 7.00% |  |  |
Postretirement Health Coverage | Equity Securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target plan asset allocation |  | 69.00% |  |
Postretirement Health Coverage | Fixed Income Securities and Cash and Cash Equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target plan asset allocation |  | 31.00% |  |

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- Definition Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs, Amortization Period For Asset Gain (Loss) + References No definition available. + Details
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- Definition Defined Benefit Plan, Retirement Age Threshold + References No definition available. + Details
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of employer security in which defined benefit plan asset is invested. Includes, but is not limited to, security issued or managed by related party of employer. + 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 (n) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + Details
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