Employee Retirement Benefit Plans

12 Months Ended

Dec. 31, 2020

Compensation And Retirement Disclosure [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 2020, 2019, and 2018 was $12.1 million, $11.3 million, and $12.8 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 2020, 2019, and 2018 were $4.8 million, $4.1 million, and $4.5 million, respectively.