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Employee Retirement Benefit Plans
 12 Months Ended
Dec. 31, 2021
Retirement Benefits [Abstract]  
Employee Retirement Benefit Plans

10. Employee Retirement Benefit Plans

We sponsor a defined contribution plan covering substantially all of our U.S.-based employees. Participants may contribute up to 100% of their eligible pay, subject to certain limitations, as pretax, salary deferral contributions. We make certain matching, and at our discretion, non-elective employer contributions to the plan. All contributions are subject to certain IRS limitations. The expense related to these contributions for 2021, 2020, and 2019 was $12.4 million, $12.1 million, and $11.3 million, respectively. We also have defined contribution-type plans for certain of our non-U.S.-based employees. The total contributions made to these plans in 2021, 2020, and 2019 were $6.1 million, $4.8 million, and $4.1 million, respectively.