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Retirement Plans - Assumptions (Details)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate used to compute benefit obligations 2.76% 2.38%
Discount rate used to compute periodic benefit cost 2.38% 3.15%
Expected long-term rates of return on plans' assets 4.70% 4.70%
U.K Plan    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate used to compute benefit obligations 1.82% 1.60%
Discount rate used to compute periodic benefit cost 1.60% 1.93%
Expected long-term rates of return on plans' assets 2.10% 2.54%