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Fair Value Measurements - Reconciliation of Level 3 Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Beginning of measurement period $ 443,157 $ 477,728
Actual return on plan assets:    
End of measurement period 426,136 443,157
U.K Plan    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Beginning of measurement period 156,142  
Actual return on plan assets:    
End of measurement period 169,744 156,142
U.S.    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Beginning of measurement period 271,412  
Actual return on plan assets:    
End of measurement period 261,364 271,412
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 4,927 9,475
Actual return on plan assets:    
Related to assets still held at the reporting date 107 (4,548)
Related to assets sold during the period 63  
Purchases, sales and settlements, net (3,113) 0
Transfers into Level 3 966  
End of measurement period 2,950 4,927
Significant Unobservable Inputs (Level 3) | U.S.    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Beginning of measurement period 11,299 18,194
Actual return on plan assets:    
Related to assets still held at the reporting date (1,350) (6,929)
Related to assets sold during the period (264)  
Purchases, sales and settlements, net 843 34
Transfers into Level 3 0  
End of measurement period $ 10,528 $ 11,299