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Retirement Benefits - Narrative (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) employee shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2020 employee
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined benefit plan, funded percentage |  |  | 113.00% |  |  |
Other noncurrent assets |  |  | $ 93,400 |  |  |
Liability, defined benefit plan |  |  | 82,600 |  |  |
Accumulated benefit obligation for all defined benefit pension plans |  | $ 193,300 | $ 204,400 | $ 193,300 |  |
Percentage of excess gains and losses over benefit obligation or market value of assets amortized |  |  | 10.00% |  |  |
Costs of defined contribution plans |  |  | $ 12,500 | 12,400 | $ 12,200 |
Number of participants covering under multi employer pension plan | employee |  |  | 305 |  |  |
Costs of bargaining unit-sponsored multi-employer plans and defined contribution plans |  |  | $ 1,100 | 1,100 | 1,100 |
Weighted average annual rate of increase in the per capita cost of covered health care benefits assumed |  |  | 5.64% |  |  |
Assumed decrease of weighted average health care cost trend rate |  |  | 4.50% |  |  |
Year that reaches assumed decrease of weighted average health care cost trend rate |  |  | 2038 |  |  |
Stock held in plan assets (in shares) | shares |  |  | 0 |  |  |
Estimated Future Benefit Payments |  |  |  |  |  |
2021 |  |  | $ 88,500 |  |  |
2022 |  |  | 5,900 |  |  |
2023 |  |  | 5,900 |  |  |
2024 |  |  | 6,100 |  |  |
2025 |  |  | 6,300 |  |  |
2026 to 2030 |  |  | 32,300 |  |  |
Other (Income) Expense Net |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Settlement loss recognized | $ 900 | 700 |  |  |  |
Net periodic benefit cost |  |  | 1,000 |  |  |
Defined Contribution Plan |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined contribution plan, expected contribution for next fiscal year |  |  | 13,100 |  |  |
401k |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined contribution plan, expected contribution for next fiscal year |  |  | $ 10,100 |  |  |
U.S. | Equity Securities |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Target allocation of fund assets in equities |  |  | 10.00% |  |  |
U.S. | Fixed Income Securities | Minimum |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Target allocation of fund assets in equities |  |  | 90.00% |  |  |
UK | Equity Securities |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Target allocation of fund assets in equities |  |  | 60.00% |  |  |
UK | Equity Securities | Minimum |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Target allocation of fund assets in equities |  |  | 50.00% |  |  |
UK | Equity Securities | Maximum |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Target allocation of fund assets in equities |  |  | 60.00% |  |  |
UK | Fixed Income Securities |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Target allocation of fund assets in equities |  |  | 40.00% |  |  |
UK | Fixed Income Securities | Minimum |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Target allocation of fund assets in equities |  |  | 40.00% |  |  |
UK | Fixed Income Securities | Maximum |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Target allocation of fund assets in equities |  |  | 50.00% |  |  |
Pension Benefits |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Participants affected due to plan freeze | employee |  |  |  |  |  | 60
Defined benefit plan, expected contribution for next fiscal year |  |  | $ 3,400 |  |  |
Pension Benefits | U.S. |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Settlement loss recognized |  |  | 910 | 713 | (1) |
Net periodic benefit cost |  |  | 269 | (2,733) | (2,288) |
Other noncurrent assets |  | 1,921 | 10,754 | 1,921 |  |
Pension Benefits | Non-U.S. |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Settlement loss recognized |  |  | (385) | 0 | (307) |
Net periodic benefit cost |  |  | (3,446) | (3,354) | (3,338) |
Other noncurrent assets |  | 14 | $ 3 | 14 |  |
Pension Benefits | UK |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Target allocation of fund assets in equities |  |  | 2.50% |  |  |
Other Benefits |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Net periodic benefit cost |  |  | $ (698) | (775) | $ (741) |
Other noncurrent assets |  | $ 0 | 0 | $ 0 |  |
Defined benefit plan, expected contribution for next fiscal year |  |  | $ 1,000 |  |  |

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