Benefit Plans	12 Months Ended
	Dec. 31, 2021
Retirement Benefits [Abstract]
Benefit Plans	Benefit PlansWe maintain a contributory defined contribution 401(k) plan for our U.S. employees, where company-matched contributions are fully vested. Additional contributory plans are in effect internationally, including in the U.K. and Ireland. Our contribution expense for such plans was $7.6 million, $6.5 million and $6.2 million in 2021, 2020 and 2019, respectively.