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Retirement Plans - Plan Asset Allocation (Details)
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]    
Total asset allocation 100.00% 100.00%
U.S. | Equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Total asset allocation 16.90% 23.40%
U.S. | Fixed income securities    
Defined Benefit Plan Disclosure [Line Items]    
Total asset allocation 65.50% 67.20%
U.S. | Alternative strategies    
Defined Benefit Plan Disclosure [Line Items]    
Total asset allocation 5.70% 6.20%
U.S. | Cash, cash equivalents and short-term investment funds    
Defined Benefit Plan Disclosure [Line Items]    
Total asset allocation 11.90% 3.20%
U.K Plan | Equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Total asset allocation 0.00% 17.90%
U.K Plan | Fixed income securities    
Defined Benefit Plan Disclosure [Line Items]    
Total asset allocation 66.20% 68.30%
U.K Plan | Alternative strategies    
Defined Benefit Plan Disclosure [Line Items]    
Total asset allocation 23.10% 13.00%
U.K Plan | Cash, cash equivalents and short-term investment funds    
Defined Benefit Plan Disclosure [Line Items]    
Total asset allocation 10.70% 0.80%