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Retirement Plans - Defined Benefit Pension Plan Amendments and Settlement (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Loss on pension settlement | $ 138,000 | $ (400) | $ 137,900 | $ 21,900
(Gain) loss on pension settlement |  | (406) | 137,898 | 21,900
Defined Benefit Pension Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Loss on partial pension settlement |  | $ (406) | 137,898 | $ 21,900
Defined Benefit Pension Plans | UK Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Loss on partial pension settlement |  |  | $ (138,000) |

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- Definition Amount of expense (reversal of expense) for net periodic benefit cost components, excluding service cost component, of defined benefit plan. Amount includes, but is not limited to, interest cost, expected (return) loss on plan asset, amortization of prior service cost (credit), amortization of (gain) loss, amortization of transition (asset) obligation, settlement (gain) loss, curtailment (gain) loss and certain termination benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 + Details
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- Definition Amount of noncash expense (reversal of expense) for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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