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Fair Value Measurements - Reconciliation of Level 3 Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
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