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Employee Benefit Plans
 12 Months Ended
Dec. 31, 2024
Retirement Benefits [Abstract]  
Employee Benefit Plans Employee Benefit Plans
The Company offers various defined contribution plans for our U.S. and non-U.S. employees. Total defined contribution plan expense was $13.2 million, $12.8 million, and $13.4 million during the years ended December 31, 2024, 2023, and 2022, respectively.

ACI 401(k) Plan
The ACI 401(k) Plan is a defined contribution plan covering all domestic employees of the Company. Participants may contribute up to 75% of their annual eligible compensation up to a maximum of $23,000 (for employees who are under the age of 50 on December 31, 2024) or a maximum of $30,500 (for employees aged 50 or older on December 31, 2024). The Company matches 100% of the first 4% of eligible participant contributions and 50% of the next 4% of eligible participant contributions, not to exceed $6,000 per employee annually. Effective January 1, 2024, employees are eligible for the Company match immediately. Employees hired January 1, 2024, and after have a one year vesting schedule for the match. Company contributions charged to expense were $6.2 million, $5.0 million, and $6.2 million during the years ended December 31, 2024, 2023, and 2022, respectively.

ACI Worldwide EMEA Group Personal Pension Scheme
The ACI Worldwide EMEA Group Personal Pension Scheme is a defined contribution plan covering substantially all ACI Worldwide (EMEA) Limited (“ACI-EMEA”) employees. For those ACI-EMEA employees who elect to participate in the plan, the Company contributes a minimum of 8.5% of eligible compensation to the plan for employees employed at December 1, 2000 or from 7% to 10% of eligible compensation for employees employed subsequent to December 1, 2000. ACI-EMEA contributions charged to expense were $1.7 million during both the years ended December 31, 2024 and 2023, and $1.6 million during the year ended December 31, 2022.