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Defined Benefit Pension Plans - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net periodic benefit cost, non-service cost | $ 2,448,000 | $ 2,192,000 | $ 4,971,000 | $ 4,337,000
Contributions by employer |  |  | 0 | 0
U.K. Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Contributions by employer |  |  | $ 1,205,000 | $ 1,025,000

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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 -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A + Details
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- Details
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