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Employee Benefit Plans and Other Postretirement Benefits - Additional Information (Details) - Pension Plans - Qualified Plan - USD ($) | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Pension Contributions [Abstract] |  |
Contributions to pension plan | $ 700,000 | $ 2,200,000
Minimum |  |
Pension Contributions [Abstract] |  |
Expected contributions to pension plan | $ 15,800,000 |

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