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Employee Benefit Plans - Narrative (Details) - USD ($) $ in Thousands, shares in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Compensation and Retirement Disclosure [Abstract] |  |  |  |  |
Settlement loss | $ 0 |  | $ 231,000 | $ 46,000 | $ 231,000
Number of days used to compute performance period average closing price of restricted stock units |  |  |  | 20 days |
Pension Benefits |  |  |  |  |
Compensation and Retirement Disclosure [Abstract] |  |  |  |  |
Special termination benefits related to VSL programs | 0 |  | (35,000) | $ 0 | (35,000)
Settlement loss | 0 |  | 71,000 | 0 | 71,000
Other Postretirement Benefits |  |  |  |  |
Compensation and Retirement Disclosure [Abstract] |  |  |  |  |
Special termination benefits related to VSL programs | 0 |  | (125,000) | (46,000) | (125,000)
Settlement loss | $ 0 |  | $ 0 | 0 | $ 0
Employee Separation | Voluntary Separation Leave Programs |  |  |  |  |
Compensation and Retirement Disclosure [Abstract] |  |  |  |  |
Special termination benefits related to VSL programs |  | $ 46,000 |  | $ 46,000 |
Employee Separation | Voluntary Separation Leave Programs | Part-Time Employees |  |  |  |  |
Compensation and Retirement Disclosure [Abstract] |  |  |  |  |
One-time per employee contribution for special termination benefits related to VSL programs |  | 75 |  |  |
Employee Separation | Voluntary Separation Leave Programs | Full-Time Employees |  |  |  |  |
Compensation and Retirement Disclosure [Abstract] |  |  |  |  |
One-time per employee contribution for special termination benefits related to VSL programs |  | $ 125 |  |  |
RSUs |  |  |  |  |
Compensation and Retirement Disclosure [Abstract] |  |  |  |  |
Awards granted (in shares) |  |  |  | 2.9 |
Vesting percentage |  |  |  | 25.00% |
Vesting period |  |  |  | 6 months |
Term of award |  |  |  | two-year |
Time-Vested RSUs |  |  |  |  |
Compensation and Retirement Disclosure [Abstract] |  |  |  |  |
Awards granted (in shares) |  |  |  | 1.3 |
Performance-Based RSUs |  |  |  |  |
Compensation and Retirement Disclosure [Abstract] |  |  |  |  |
Awards granted (in shares) |  |  |  | 1.6 |

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- Definition Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due To Settlement, Restructuring And Special And Contractual Termination Benefits + References No definition available. + Details
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- Definition Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due To Special And Contractual Termination Benefits + References No definition available. + Details
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- Definition The time period over which the stock closing prices are averaged to arrive at a per-share valuation for equity based awards such as Restricted Stock Units, Performance Share and other equity based awards. + References No definition available. + Details
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