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Employee Benefit Plans and Other Postretirement Benefits - Additional Information (Details) - Pension Plans - Qualified Plan - USD ($) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Pension Contributions [Abstract] |  |  |  |
Contributions to pension plan | $ 3,900,000 | $ 1,000,000.0 | $ 4,600,000 | $ 3,200,000
Minimum |  |  |  |
Pension Contributions [Abstract] |  |  |  |
Expected contributions to pension plan | $ 15,800,000 |  | $ 15,800,000 |

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