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Fair Value Measurements - Reconciliation of Level 3 Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Beginning of measurement period | $ 739,789 | $ 741,191
Actual return on plan assets: |  |
End of measurement period | 477,728 | 739,789
U.K Plan |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Beginning of measurement period | 312,126 |
Actual return on plan assets: |  |
End of measurement period | 174,873 | 312,126
U.S. |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Beginning of measurement period | 389,689 |
Actual return on plan assets: |  |
End of measurement period | 281,159 | 389,689
Significant Unobservable Inputs (Level 3) | U.K Plan |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Beginning of measurement period | 11,255 | 9,572
Actual return on plan assets: |  |
Related to assets still held at the reporting date | (1,780) | 1,683
Purchases, sales and settlements, net |  | 0
End of measurement period | 9,475 | 11,255
Significant Unobservable Inputs (Level 3) | U.S. |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Beginning of measurement period | 19,268 | 21,861
Actual return on plan assets: |  |
Related to assets still held at the reporting date | (1,074) | 3,506
Purchases, sales and settlements, net |  | (6,099)
End of measurement period | $ 18,194 | $ 19,268

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