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Retirement Plans
12 Months Ended
Dec. 31, 2021
Retirement Benefits [Abstract]  
Retirement Plans Retirement Plans The Company operates defined contribution retirement plans for the majority of its employees at varying rates of their salaries. Total contributions by the Company to the retirement plans were $13.5 million in the twelve months ended December 31, 2021 (2020 — $12.1 million, 2019 — $12.9 million).