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Pension and Other Postretirement Benefits - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined contribution expense | $ 10,000 | $ 12,100 | $ 11,800
Accumulated benefit obligation | $ 518,400 | 456,900 |
Target asset allocation for the investment of the assets in fixed income securities minimum | 50.00% |  |
Target asset allocation for the investment of the assets in fixed income securities maximum | 90.00% |  |
Target asset allocation for the investment of the assets in equity securities minimum | 10.00% |  |
Target asset allocation for the investment of the assets in equity securities maximum | 50.00% |  |
Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target asset allocation for the investment of the assets in fixed income securities | 30.00% |  |
Target asset allocation for the investment of the assets in equity securities | 50.00% |  |
Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target asset allocation for the investment of the assets in fixed income securities | 50.00% |  |
Target asset allocation for the investment of the assets in equity securities | 70.00% |  |
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plans with projected benefit obligation in excess of plan assets, projected benefit obligation | $ 297,800 | 293,700 |
Pension plans with projected benefit obligation in excess of plan assets, accumulated benefit obligation | 459,200 | 400,400 |
Pension plans with projected benefit obligation in excess of plan assets, fair value of plan assets | 463,200 | 404,900 |
Settlement loss (gain) | 3,153 |  | $ 1,300
Anticipated pension and other postretirement plans contributions, next fiscal year | 11,400 |  |
Other Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Other postretirement plans with accumulated benefit obligation in excess of plan assets, accumulated benefit obligation | 59,200 | 29,500 |
Other postretirement plans with accumulated benefit obligation in excess of plan assets, fair value of plan assets | 64,000 | $ 0 |
Settlement loss (gain) | 0 |  |
Anticipated pension and other postretirement plans contributions, next fiscal year | $ 1,500 |  |

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