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Employee Benefit Plans - Narrative (Details) - USD ($) | Jan. 01, 2020 | Jan. 01, 2019 | Mar. 31, 2021
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Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected contributions to the Company's qualified pension plans in 2021 |  |  | $ 0
Other Post-retirement Benefits Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Life insurance and contributions to the medical program for eligible retirees will be eliminated (younger than) |  | 65 years |
Life insurance and contributions to the medical program for eligible retirees will be eliminated (older than) | 65 years |  |

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- Definition Defined Benefit Plan, Plan Amendment, Elimination of Benefits, Minimum Age + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of contribution expected to be received by defined benefit plan from employer in remainder of current fiscal year. Excludes contribution previously paid by employer in current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 + Details
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- Details
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