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Employee Retirement Benefit Plans
 12 Months Ended
Dec. 31, 2023
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. Eligible participants may defer up to 100% of their eligible pay, subject to certain limitations, as pre-tax, Roth, or traditional after-tax contributions. We make certain matching, and at our discretion, non-elective employer contributions to the plan. All contributions are subject to certain IRS limits. The expense related to these contributions for 2023, 2022, and 2021 was $12.8 million, $13.2 million, and $12.4 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 2023, 2022, and 2021 were $7.7 million, $6.6 million, and $6.1 million, respectively.