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Retirement Plans - Plan Asset Allocation (Details)
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]    
Total asset allocation 100.00% 100.00%
U.K Plan | Equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Total asset allocation 0.00% 0.00%
U.K Plan | Fixed income securities    
Defined Benefit Plan Disclosure [Line Items]    
Total asset allocation 73.60% 74.10%
U.K Plan | Alternative strategies    
Defined Benefit Plan Disclosure [Line Items]    
Total asset allocation 25.90% 24.40%
U.K Plan | Cash, cash equivalents and short-term investment funds    
Defined Benefit Plan Disclosure [Line Items]    
Total asset allocation 0.40% 1.50%
U.S. | Equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Total asset allocation 14.70% 14.60%
U.S. | Fixed income securities    
Defined Benefit Plan Disclosure [Line Items]    
Total asset allocation 77.90% 75.80%
U.S. | Alternative strategies    
Defined Benefit Plan Disclosure [Line Items]    
Total asset allocation 4.20% 4.60%
U.S. | Cash, cash equivalents and short-term investment funds    
Defined Benefit Plan Disclosure [Line Items]    
Total asset allocation 3.20% 5.00%