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Benefit Plans - Summary of Weighted Average Assumptions (Details) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Retirement Benefits [Abstract] |  |  |
Discount rate for obligations | 8.75% | 10.50% | 9.25%
Discount rate for net periodic benefit costs | 10.50% | 9.25% | 8.50%
Rate of compensation increases | 4.50% | 4.50% | 4.50%

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