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Pension Plans and Other Postretirement Benefits - Additional Information (Details) - USD ($) $ in Thousands |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jan. 01, 2019 | Jan. 01, 2018 | Jan. 01, 2017 | Jan. 01, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Accumulated benefit obligation for defined benefit pension plans |  |  |  |  | $ 867,400 | $ 949,000 |  |
Weighted-average expected rate of return on plan assets |  | 6.73% | 6.73% | 6.85% |  |  |  |
Actual rate of return |  |  |  |  | (4.55%) | 14.31% | 8.11% |
Percentage of defined benefit plan assets in U.S. and U.K. |  |  |  |  | 97.00% |  |  |
Change in percentage of broad asset class targets |  |  |  |  | 10.00% |  |  |
Pension and postretirement contributions |  |  |  |  | $ 15,236 | $ 13,341 | $ 20,068 |
Assumed rate of increase in the pre-65 per capita cost of covered health care benefits for U.S. retirees |  |  |  |  | 0.00% |  |  |
Assumed rate of increase in the post-65 per capita cost of covered health care benefits for U.S. retirees |  |  |  |  | 0.00% |  |  |
Pension Plans |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Expected contributions to benefit plans in 2019 |  |  |  |  | $ 12,000 |  |  |
Other Postretirement Benefits |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Weighted-average expected rate of return on plan assets |  |  |  |  | 7.00% | 7.00% | 7.00% |
Discount rate |  |  |  |  | 4.55% | 3.99% |  |
Expected premium contribution |  |  |  |  | $ 4,000 |  |  |
Projected benefit obligation recognized |  |  |  |  | 50,390 | $ 56,647 | $ 56,141 |
Supplemental Executive Retirement Plan |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Expected contributions to benefit plans in 2019 |  |  |  |  | 1,300 |  |  |
Costs (credits) related to supplemental executive retirement plan |  |  |  |  | (800) | 2,600 | $ 1,600 |
Projected benefit obligation recognized |  |  |  |  | $ 21,900 | $ 24,800 |  |
Foreign Plans | Pension Plans |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Weighted-average expected rate of return on plan assets |  |  |  |  | 5.52% | 6.16% | 6.66% |
Discount rate |  |  |  |  | 2.15% | 1.94% | 2.00% | 2.76%
Projected benefit obligation recognized |  |  |  |  | $ 240,303 | $ 275,006 | $ 246,280 |
Foreign Plans | Employee Savings Plan | Pension Plans |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Defined contribution plan, employer contributions |  |  |  |  | $ 10,200 | $ 9,900 | $ 9,500 |
Foreign Plans | Subsequent Event | Pension Plans |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Weighted-average expected rate of return on plan assets | 5.69% |  |  |  |  |  |  |
U.S. Plans | Pension Plans |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Weighted-average expected rate of return on plan assets |  |  |  |  | 6.89% | 6.89% | 6.89% |
Discount rate |  |  |  |  | 4.59% | 4.03% | 4.43% | 4.67%
Projected benefit obligation recognized |  |  |  |  | $ 635,866 | $ 685,963 | $ 665,688 |
Defined contribution plan, employer matching contribution percentage |  |  |  |  | 5.00% |  |  |
U.S. Plans | 2004 Defined Contribution Plan | Pension Plans |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Defined contribution plan, employer contributions |  |  |  |  | $ 11,800 | 10,300 | 15,100 |
U.S. Plans | Employee Savings Plan | Pension Plans |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Defined contribution plan, employer contributions |  |  |  |  | $ 12,700 | $ 11,300 | $ 12,700 |
U.S. Plans | Subsequent Event | Pension Plans |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Weighted-average expected rate of return on plan assets | 6.89% |  |  |  |  |  |  |

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