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Retirement Plans - Narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined contribution plan, cost recognized | $ 23,641,000 | $ 25,226,000 | $ 23,417,000
Defined benefit plan, voluntary contribution | $ 10,446,000 | 1,112,000 |
Corridor amount | 10.00% |  |
Net unrecognized actuarial losses expected to be recognized in 2018 | $ 10,400,000,000 |  |
Net unrecognized actuarial losses expected to be recognized in 2018, net of tax | 7,700,000,000 |  |
Net periodic benefit cost (income), non-service cost | (569,000) | 3,559,000 | (2,590,000)
U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, planned contributions for each of next 5 years |  | $ 9,000,000 |
Defined benefit plan, voluntary contribution |  |  | $ 10,000,000
Increase (decrease) in projected benefit obligation | $ (3,063,000) |  |
Discount rate used to compute periodic benefit cost | 3.92% |  |
Expected long-term rates of return on plans' assets in next fiscal year | 4.70% |  |
U.K Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate used to compute periodic benefit cost | 1.71% |  |
Expected long-term rates of return on plans' assets in next fiscal year |  | 2.10% |

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