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Fair Value Measurements - Pension Plan Assets within Fair Value Hierarchy (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets $ 426,136 $ 443,157 $ 477,728
U.K Plan      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 169,744 156,142  
U.K Plan | Cash and Cash Equivalents      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 701 2,272  
U.K Plan | Money Market Funds      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 46,997 42,859  
U.K Plan | US Government Agencies Debt Securities      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 78,008 72,913  
U.K Plan | Alternative strategies      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 43,372 34,998  
U.K Plan | Real Estate Funds      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 666 3,100  
U.K Plan | Quoted Prices in Active Markets (Level 1)      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 70,037 8,697  
U.K Plan | Quoted Prices in Active Markets (Level 1) | Cash and Cash Equivalents      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 701 2,272  
U.K Plan | Quoted Prices in Active Markets (Level 1) | Money Market Funds      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 0 0  
U.K Plan | Quoted Prices in Active Markets (Level 1) | US Government Agencies Debt Securities      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 61,246 0  
U.K Plan | Quoted Prices in Active Markets (Level 1) | Alternative strategies      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 8,090 6,425  
U.K Plan | Quoted Prices in Active Markets (Level 1) | Real Estate Funds      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 0 0  
U.K Plan | Significant Other Observable Inputs (Level 2)      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 96,757 142,518  
U.K Plan | Significant Other Observable Inputs (Level 2) | Cash and Cash Equivalents      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 0 0  
U.K Plan | Significant Other Observable Inputs (Level 2) | Money Market Funds      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 46,997 42,859  
U.K Plan | Significant Other Observable Inputs (Level 2) | US Government Agencies Debt Securities      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 16,762 72,913  
U.K Plan | Significant Other Observable Inputs (Level 2) | Alternative strategies      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 32,998 26,746  
U.K Plan | Significant Other Observable Inputs (Level 2) | Real Estate Funds      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 0 0  
U.K Plan | Significant Unobservable Inputs (Level 3)      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 2,950 4,927 9,475
U.K Plan | Significant Unobservable Inputs (Level 3) | Cash and Cash Equivalents      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 0 0  
U.K Plan | Significant Unobservable Inputs (Level 3) | Money Market Funds      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 0 0  
U.K Plan | Significant Unobservable Inputs (Level 3) | US Government Agencies Debt Securities      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 0 0  
U.K Plan | Significant Unobservable Inputs (Level 3) | Alternative strategies      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 2,284 1,827  
U.K Plan | Significant Unobservable Inputs (Level 3) | Real Estate Funds      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 666 3,100  
US      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 261,364 271,412  
Other plan liabilities, net [1] (31,891) (8,412)  
Net Plan Assets 229,473 263,000  
US | Cash and Cash Equivalents      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 2,551 3,482  
US | Short-term Investments      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 5,782 10,119  
US | United States Equity Securities      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 24,304 24,103  
US | International Equity Securities      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 14,039 15,394  
US | United States Fixed Income Funds      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 181,619 186,648  
US | International Fixed Income Funds      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 22,040 19,177  
US | Asset Categories Other      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 11,028 12,489  
US | Quoted Prices in Active Markets (Level 1)      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 49,124 55,266  
US | Quoted Prices in Active Markets (Level 1) | Cash and Cash Equivalents      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 2,551 3,482  
US | Quoted Prices in Active Markets (Level 1) | Short-term Investments      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 0 0  
US | Quoted Prices in Active Markets (Level 1) | United States Equity Securities      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 0 0  
US | Quoted Prices in Active Markets (Level 1) | International Equity Securities      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 0 0  
US | Quoted Prices in Active Markets (Level 1) | United States Fixed Income Funds      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 46,572 51,784  
US | Quoted Prices in Active Markets (Level 1) | International Fixed Income Funds      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 0 0  
US | Quoted Prices in Active Markets (Level 1) | Asset Categories Other      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 0 0  
US | Significant Other Observable Inputs (Level 2)      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 201,712 204,847  
US | Significant Other Observable Inputs (Level 2) | Cash and Cash Equivalents      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 0 0  
US | Significant Other Observable Inputs (Level 2) | Short-term Investments      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 5,782 10,119  
US | Significant Other Observable Inputs (Level 2) | United States Equity Securities      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 24,304 24,103  
US | Significant Other Observable Inputs (Level 2) | International Equity Securities      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 14,039 15,394  
US | Significant Other Observable Inputs (Level 2) | United States Fixed Income Funds      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 135,047 134,864  
US | Significant Other Observable Inputs (Level 2) | International Fixed Income Funds      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 22,040 19,177  
US | Significant Other Observable Inputs (Level 2) | Asset Categories Other      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 500 1,190  
US | Significant Unobservable Inputs (Level 3)      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 10,528 11,299 $ 18,194
US | Significant Unobservable Inputs (Level 3) | Cash and Cash Equivalents      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 0 0  
US | Significant Unobservable Inputs (Level 3) | Short-term Investments      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 0 0  
US | Significant Unobservable Inputs (Level 3) | United States Equity Securities      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 0 0  
US | Significant Unobservable Inputs (Level 3) | International Equity Securities      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 0 0  
US | Significant Unobservable Inputs (Level 3) | United States Fixed Income Funds      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 0 0  
US | Significant Unobservable Inputs (Level 3) | International Fixed Income Funds      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets 0 0  
US | Significant Unobservable Inputs (Level 3) | Asset Categories Other      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Total plan assets $ 10,528 $ 11,299  
[1] net amounts payable for unsettled security transactions.