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Employee Benefit Plans (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Schedule Of Defined Contribution Plans Disclosures [Line Items] |  |  |
Defined contribution plan, cost | $ 13,200,000 | $ 12,800,000 | $ 13,400,000
ACI 401(k) Plan |  |  |
Schedule Of Defined Contribution Plans Disclosures [Line Items] |  |  |
Defined contribution plan, cost | $ 6,200,000 | 5,000,000.0 | 6,200,000
Defined contribution plan, maximum annual contribution per employee, percentage | 75.00% |  |
Defined contribution plan, employer matching contribution, percentage of match | 100.00% |  |
Defined contribution plan, employer matching contribution, percent of eligible participant contributions | 4.00% |  |
Defined contribution plan, employer matching contribution, maximum amount per employee | $ 6,000 |  |
Defined contribution plan, service period requirement for company match | 1 year |  |
ACI 401(k) Plan | Employees under Age 50 |  |  |
Schedule Of Defined Contribution Plans Disclosures [Line Items] |  |  |
Defined contribution plan, maximum annual contribution per employee, amount | $ 23,000 |  |
ACI 401(k) Plan | Employees Aged 50 or Older |  |  |
Schedule Of Defined Contribution Plans Disclosures [Line Items] |  |  |
Defined contribution plan, maximum annual contribution per employee, amount | $ 30,500 |  |
ACI 401(k) Plan | Second Eligible Participant Contributions |  |  |
Schedule Of Defined Contribution Plans Disclosures [Line Items] |  |  |
Defined contribution plan, employer matching contribution, percentage of match | 50.00% |  |
ACI 401(k) Plan | Second Eligible Participant Contributions | Maximum |  |  |
Schedule Of Defined Contribution Plans Disclosures [Line Items] |  |  |
Defined contribution plan, employer matching contribution, percent of eligible participant contributions | 4.00% |  |
ACI Worldwide EMEA Group Personal Pension Scheme |  |  |
Schedule Of Defined Contribution Plans Disclosures [Line Items] |  |  |
Defined contribution plan, cost | $ 1,700,000 | $ 1,700,000 | $ 1,600,000
ACI Worldwide EMEA Group Personal Pension Scheme | Employed at December 1, 2000 |  |  |
Schedule Of Defined Contribution Plans Disclosures [Line Items] |  |  |
Defined contribution plan, employer discretionary contribution, percentage of eligible compensation | 8.50% |  |
ACI Worldwide EMEA Group Personal Pension Scheme | Employed Subsequent to December 1, 2000 | Minimum |  |  |
Schedule Of Defined Contribution Plans Disclosures [Line Items] |  |  |
Defined contribution plan, employer discretionary contribution, percentage of eligible compensation | 7.00% |  |
ACI Worldwide EMEA Group Personal Pension Scheme | Employed Subsequent to December 1, 2000 | Maximum |  |  |
Schedule Of Defined Contribution Plans Disclosures [Line Items] |  |  |
Defined contribution plan, employer discretionary contribution, percentage of eligible compensation | 10.00% |  |

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- Definition Percentage of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- Definition Maximum amount matched by the employer, per employee, under a defined contribution plan. + References No definition available. + Details
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- Definition Defined Contribution Plan, Employer Matching Contribution, Service Period Requirement For Company Match + References No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 70 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480794/715-70-50-1 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- Definition Maximum amount the employee may contribute to a defined contribution plan. + References No definition available. + Details
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