Condensed Consolidated Financial Statements (Policies)	3 Months Ended
Mar. 31, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Consolidation	The unaudited condensed consolidated financial statements include the accounts of ACI Worldwide, Inc. and its wholly-owned subsidiaries (collectively, the “Company”). All intercompany balances and transactions have been eliminated. The condensed consolidated financial statements as of March 31, 2025, and for the three months ended March 31, 2025 and 2024, are unaudited and reflect all adjustments of a normal recurring nature, which are, in the opinion of management, necessary for a fair presentation, in all material respects, of the financial position and operating results for the interim periods. The condensed consolidated balance sheet as of December 31, 2024, is derived from the audited financial statements. The condensed consolidated financial statements contained herein should be read in conjunction with the consolidated financial statements and notes thereto contained in the Company’s annual report on Form 10-K for the fiscal year ended December 31, 2024, filed on February 27, 2025. Results for the three months ended March 31, 2025, are not necessarily indicative of results that may be attained in the future.
Use of Estimates	The preparation of condensed consolidated financial statements in conformity with accounting principles generally accepted in the United States (“U.S. GAAP”) requires management to make judgments, estimates, and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. These estimates and assumptions are affected by management’s application of accounting policies, as well as uncertainty in the current economic environment. Actual results could differ from those estimates.
Settlement Assets and Liabilities	Settlement Assets and Liabilities Individuals and businesses settle their obligations to the Company’s various Biller clients using credit or debit cards or via automated clearing house (“ACH”) payments. The Company creates a receivable for the amount due from the credit or debit card processor and an offsetting payable to the client. Upon confirmation that the funds have been received, the Company settles the obligation to the client. Due to timing, in some instances, the Company may (1) receive the funds into bank accounts controlled by and in the Company’s name that are not disbursed to its clients by the end of the day, resulting in a settlement deposit on the Company’s books and (2) disburse funds to its clients in advance of receiving funds from the credit or debit card processor, resulting in a net settlement receivable position.
Off Balance Sheet Settlement Accounts	Off Balance Sheet Settlement Accounts The Company also enters into agreements with certain Biller clients to process payment funds on their behalf. When an ACH or automated teller machine network payment transaction is processed, a transaction is initiated to withdraw funds from the designated source account and deposit them into a settlement account, which is a trust account maintained for the benefit of the Company’s clients. A simultaneous transaction is initiated to transfer funds from the settlement account to the intended destination account. These “back to back” transactions are designed to settle at the same time, usually overnight, such that the Company receives the funds from the source at the same time as it sends the funds to their destination. However, due to the transactions being with various financial institutions there may be timing differences that result in float balances. These funds are maintained in accounts for the benefit of the client which is separate from the Company’s corporate assets. As the Company does not take ownership of the funds, these settlement accounts are not included in the Company’s balance sheet. The Company is entitled to interest earned on the fund balances. The collection of interest on these settlement accounts is considered in the Company’s determination of its fee structure for clients and represents a portion of the payment for services performed by the Company.
Fair Value	Fair Value The fair value of the Company’s Credit Agreement approximates the carrying value due to the floating interest rate (Level 2 of the fair value hierarchy). The Company measures the fair value of its Senior Notes based on Level 2 inputs, which include quoted market prices and interest rate spreads of similar securities.
Goodwill	Goodwill In accordance with the Accounting Standards Codification ("ASC") 350, Intangibles – Goodwill and Other, the Company assesses goodwill for impairment annually during the fourth quarter of its fiscal year using October 1 balances or when there is evidence that events or changes in circumstances indicate that the carrying amount of the asset may not be recovered. The Company evaluates goodwill at the reporting unit level, and as discussed in Note 9, Segment Information, during the three months ended March 31, 2025, it realigned Banks and Merchants under a single general manager leading Payment Software. This change also resulted in a change in reporting units - combining Banks and Merchants into Payment Software, while maintaining Biller. As of March 31, 2025, the Company's goodwill balance of $1.2 billion was allocated $809.0 million to Payment Software and $417.0 million to Biller. Recoverability of goodwill is measured using a discounted cash flow model incorporating discount rates commensurate with the risks involved. Use of a discounted cash flow model is common practice in impairment testing in the absence of available transactional market evidence to determine the fair value. The calculated fair value was substantially in excess of the current carrying value for all reporting units based upon the October 1, 2024, annual impairment test and there have been no indications of impairment in the subsequent periods.
Equity Method Investment	Equity Method Investment In July 2019, the Company invested $18.3 million for a 30% non-controlling financial interest in a payment technology and services company in India. The Company accounted for this investment using the equity method in accordance with ASC 323, Investments - Equity Method and Joint Ventures, and recorded its share of earnings and losses in the investment on a one-quarter lag basis. The Company had recorded an investment of $18.6 million, included in other noncurrent assets in the condensed consolidated balance sheet as of December 31, 2024. In March 2025, the Company sold its 30% interest for $46.0 million. The Company recognized a gain on the sale of $25.9 million, which is recorded in other, net in the condensed consolidated statements of operations.
Recently Issued Accounting Standards Not Yet Effective and Recently Adopted Accounting Pronouncements	Recently Issued Accounting Standards Not Yet Effective In November 2024, the FASB issued ASU 2024-03, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses. The amendments in this update will require entities to provide disaggregated disclosures of specific expense categories underlying certain income statement expense line items on an annual and interim basis. ASU 2024-03 is effective for annual periods beginning after December 15, 2026, and early application is permitted for annual financial statements that have not yet been issued or made available for issuance. The Company is currently assessing the impact that the adoption of ASU 2024-03 will have on its financial statement footnote disclosures. Recently Adopted Accounting Pronouncements In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, to enhance the transparency and decision usefulness of income tax disclosures. The amendments in this update will require disclosure of more disaggregated information about a reporting entity's effective tax rate reconciliation and income taxes paid. ASU 2023-09 is effective for our annual period beginning after December 15, 2024. ASU 2023-09 is expected to impact our income tax disclosures beginning with the consolidated financial statements included in the annual report on Form 10-K for the fiscal year ended December 31, 2025, but is not expected to have an impact on the Company's financial position, results of operations or cash flows.
Earnings (Loss) Per Share	Basic earnings (loss) per share is computed in accordance with ASC 260, Earnings Per Share, based on weighted average outstanding common shares. Diluted earnings (loss) per share is computed based on basic weighted average outstanding common shares adjusted for the dilutive effect of stock options, RSUs, and certain contingently issuable shares for which performance targets have been achieved.
Segment Reporting	In 2025, the Company made a change in organizational structure to align with its strategic direction. As a result of this change, the Company reassessed its segment reporting structure due to changes in leadership structure and how the Company's chief operating decision maker ("CODM") assesses the Company's performance and allocates resources. Beginning in the first quarter of 2025, the Company reports financial performance based on its new operating segments, Payment Software, which includes bank and merchant customers, and Biller. The Company continues to use Segment Adjusted EBITDA as a measure of segment profitability. The Company’s Chief Executive Officer is also the chief operating decision maker. The CODM, together with other senior management personnel, focus their review on consolidated financial information and the allocation of resources based on operating results, including revenues and Segment Adjusted EBITDA, for each segment, separate from corporate operations. No operating segments have been aggregated to form the reportable segments. Payment Software. Payment Software drives payments orchestration for banks and merchants. ACI provides payment solutions to large and mid-size banks globally for retail banking, digital, and other payment services. These solutions transform banks’ complex payment environments to speed time to market, reduce costs, and deliver a consistent experience to customers across channels while enabling them to prevent and rapidly react to fraudulent activity. In addition, they enable banks to meet the requirements of different real-time payments schemes and to quickly create differentiated products to meet consumer, business, and merchant demands. ACI’s support of merchants globally includes Tier 1 and Tier 2 merchants (in-store and online), payment service providers, independent selling organizations, value-added resellers, and acquirers who service them. These customers operate in a variety of verticals, including general retail, grocery, hospitality, dining, travel and ticketing, fuel, telecommunications, and others. The Company's solutions provide merchants with a secure, omnichannel payments platform that gives them flexibility and independence. The Company also offers secure solutions to online-only merchants that provide consumers with a convenient and seamless way to shop. Biller. Within the Biller segment, ACI provides electronic bill presentment and payment services to companies operating in the consumer finance, insurance, healthcare, higher education, utility, government, mortgage, subscription provider, and telecommunications categories. The solutions enable these customers to support a wide range of payment options and provide a convenient consumer payments experience that drives consumer loyalty and increases revenue. ACI also provides fraud abuse protection to its Biller customers leveraging its proven AI, human, and data capabilities. Revenue is attributed to the reportable segments based upon customer and product. Expenses are attributed to the reportable segments in one of three methods: (1) direct costs of the segment, (2) labor costs that can be attributed based upon time tracking for individual projects, or (3) costs that are allocated. Allocated costs are generally marketing and sales related activities. Segment Adjusted EBITDA is the measure reported to the CODM for purposes of making decisions on allocating resources and assessing the performance of the Company’s segments, including budget and forecast-to-actual variances, and, therefore, Segment Adjusted EBITDA is presented in conformity with ASC 280, Segment Reporting. Segment Adjusted EBITDA is defined as earnings from operations before interest, income tax expense (benefit), depreciation and amortization (“EBITDA”) adjusted to exclude net other income (expense). Corporate and unallocated expenses includes global facilities and information technology costs and long-term product roadmap expenses in addition to corporate overhead costs that are not allocated to reportable segments. The overhead costs relate to human resources, finance, legal, accounting, and merger and acquisition activity. These costs along with depreciation and amortization and stock-based compensation are not considered when management evaluates segment performance.

Condensed Consolidated Financial Statements (Policies)

3 Months Ended

Mar. 31, 2025

Organization, Consolidation and Presentation of Financial Statements [Abstract]

The unaudited condensed consolidated financial statements include the accounts of ACI Worldwide, Inc. and its wholly-owned subsidiaries (collectively, the “Company”). All intercompany balances and transactions have been eliminated. The condensed consolidated financial statements as of March 31, 2025, and for the three months ended March 31, 2025 and 2024, are unaudited and reflect all adjustments of a normal recurring nature, which are, in the opinion of management, necessary for a fair presentation, in all material respects, of the financial position and operating results for the interim periods. The condensed consolidated balance sheet as of December 31, 2024, is derived from the audited financial statements.

The condensed consolidated financial statements contained herein should be read in conjunction with the consolidated financial statements and notes thereto contained in the Company’s annual report on Form 10-K for the fiscal year ended December 31, 2024, filed on February 27, 2025. Results for the three months ended March 31, 2025, are not necessarily indicative of results that may be attained in the future.

Use of Estimates

The preparation of condensed consolidated financial statements in conformity with accounting principles generally accepted in the United States (“U.S. GAAP”) requires management to make judgments, estimates, and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. These estimates and assumptions are affected by management’s application of accounting policies, as well as uncertainty in the current economic environment. Actual results could differ from those estimates.

Settlement Assets and Liabilities

Individuals and businesses settle their obligations to the Company’s various Biller clients using credit or debit cards or via automated clearing house (“ACH”) payments. The Company creates a receivable for the amount due from the credit or debit card processor and an offsetting payable to the client. Upon confirmation that the funds have been received, the Company settles the obligation to the client. Due to timing, in some instances, the Company may (1) receive the funds into bank accounts controlled by and in the Company’s name that are not disbursed to its clients by the end of the day, resulting in a settlement deposit on the Company’s books and (2) disburse funds to its clients in advance of receiving funds from the credit or debit card processor, resulting in a net settlement receivable position.

Off Balance Sheet Settlement Accounts

The Company also enters into agreements with certain Biller clients to process payment funds on their behalf. When an ACH or automated teller machine network payment transaction is processed, a transaction is initiated to withdraw funds from the designated source account and deposit them into a settlement account, which is a trust account maintained for the benefit of the Company’s clients. A simultaneous transaction is initiated to transfer funds from the settlement account to the intended destination account. These “back to back” transactions are designed to settle at the same time, usually overnight, such that the Company receives the funds from the source at the same time as it sends the funds to their destination. However, due to the transactions being with various financial institutions there may be timing differences that result in float balances. These funds are maintained in accounts for the benefit of the client which is separate from the Company’s corporate assets. As the Company does not take ownership of the funds, these settlement accounts are not included in the Company’s balance sheet. The Company is entitled to interest earned on the fund balances. The collection of interest on these settlement accounts is considered in the

Company’s determination of its fee structure for clients and represents a portion of the payment for services performed by the Company.

Fair Value

The fair value of the Company’s Credit Agreement approximates the carrying value due to the floating interest rate (Level 2 of the fair value hierarchy). The Company measures the fair value of its Senior Notes based on Level 2 inputs, which include quoted market prices and interest rate spreads of similar securities.

Goodwill

In accordance with the Accounting Standards Codification ("ASC") 350, Intangibles – Goodwill and Other, the Company assesses goodwill for impairment annually during the fourth quarter of its fiscal year using October 1 balances or when there is evidence that events or changes in circumstances indicate that the carrying amount of the asset may not be recovered. The Company evaluates goodwill at the reporting unit level, and as discussed in Note 9, Segment Information, during the three months ended March 31, 2025, it realigned Banks and Merchants under a single general manager leading Payment Software. This change also resulted in a change in reporting units - combining Banks and Merchants into Payment Software, while maintaining Biller. As of March 31, 2025, the Company's goodwill balance of $1.2 billion was allocated $809.0 million to Payment Software and $417.0 million to Biller.

Recoverability of goodwill is measured using a discounted cash flow model incorporating discount rates commensurate with the risks involved. Use of a discounted cash flow model is common practice in impairment testing in the absence of available transactional market evidence to determine the fair value. The calculated fair value was substantially in excess of the current carrying value for all reporting units based upon the October 1, 2024, annual impairment test and there have been no indications of impairment in the subsequent periods.

Equity Method Investment

In July 2019, the Company invested $18.3 million for a 30% non-controlling financial interest in a payment technology and services company in India. The Company accounted for this investment using the equity method in accordance with ASC 323, Investments - Equity Method and Joint Ventures, and recorded its share of earnings and losses in the investment on a one-quarter lag basis. The Company had recorded an investment of $18.6 million, included in other noncurrent assets in the condensed consolidated balance sheet as of December 31, 2024. In March 2025, the Company sold its 30% interest for $46.0 million. The Company recognized a gain on the sale of $25.9 million, which is recorded in other, net in the condensed consolidated statements of operations.

Recently Issued Accounting Standards Not Yet Effective and Recently Adopted Accounting Pronouncements

Recently Issued Accounting Standards Not Yet Effective

In November 2024, the FASB issued ASU 2024-03, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses. The amendments in this update will require entities to provide disaggregated disclosures of specific expense categories underlying certain income statement expense line items on an annual and interim basis. ASU 2024-03 is effective for annual periods beginning after December 15, 2026, and early application is permitted for annual financial statements that have not yet been issued or made available for issuance. The Company is currently assessing the impact that the adoption of ASU 2024-03 will have on its financial statement footnote disclosures.

Recently Adopted Accounting Pronouncements

In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, to enhance the transparency and decision usefulness of income tax disclosures. The amendments in this update will require disclosure of more disaggregated information about a reporting entity's effective tax rate reconciliation and income taxes paid. ASU 2023-09 is effective for our annual period beginning after December 15, 2024. ASU 2023-09 is expected to impact our income tax disclosures beginning with the consolidated financial statements included in the annual report on Form 10-K for the fiscal year ended December 31, 2025, but is not expected to have an impact on the Company's financial position, results of operations or cash flows.

Earnings (Loss) Per Share

Basic earnings (loss) per share is computed in accordance with ASC 260, Earnings Per Share, based on weighted average outstanding common shares. Diluted earnings (loss) per share is computed based on basic weighted average outstanding common shares adjusted for the dilutive effect of stock options, RSUs, and certain contingently issuable shares for which performance targets have been achieved.

Segment Reporting

In 2025, the Company made a change in organizational structure to align with its strategic direction. As a result of this change, the Company reassessed its segment reporting structure due to changes in leadership structure and how the Company's chief operating decision maker ("CODM") assesses the Company's performance and allocates resources. Beginning in the first quarter of 2025, the Company reports financial performance based on its new operating segments, Payment Software, which includes bank and merchant customers, and Biller. The Company continues to use Segment Adjusted EBITDA as a measure of segment profitability.

The Company’s Chief Executive Officer is also the chief operating decision maker. The CODM, together with other senior management personnel, focus their review on consolidated financial information and the allocation of resources based on operating results, including revenues and Segment Adjusted EBITDA, for each segment, separate from corporate operations. No operating segments have been aggregated to form the reportable segments.

Payment Software. Payment Software drives payments orchestration for banks and merchants. ACI provides payment solutions to large and mid-size banks globally for retail banking, digital, and other payment services. These solutions transform banks’ complex payment environments to speed time to market, reduce costs, and deliver a consistent experience to customers across channels while enabling them to prevent and rapidly react to fraudulent activity. In addition, they enable banks to meet the requirements of different real-time payments schemes and to quickly create differentiated products to meet consumer, business, and merchant demands. ACI’s support of merchants globally includes Tier 1 and Tier 2 merchants (in-store and online), payment service providers, independent selling organizations, value-added resellers, and acquirers who service them. These customers operate in a variety of verticals, including general retail, grocery, hospitality, dining, travel and ticketing, fuel, telecommunications, and others. The Company's solutions provide merchants with a secure, omnichannel payments platform that gives them flexibility and independence. The Company also offers secure solutions to online-only merchants that provide consumers with a convenient and seamless way to shop.

Biller. Within the Biller segment, ACI provides electronic bill presentment and payment services to companies operating in the consumer finance, insurance, healthcare, higher education, utility, government, mortgage, subscription provider, and telecommunications categories. The solutions enable these customers to support a wide range of payment options and provide a convenient consumer payments experience that drives consumer loyalty and increases revenue. ACI also provides fraud abuse protection to its Biller customers leveraging its proven AI, human, and data capabilities.

Revenue is attributed to the reportable segments based upon customer and product. Expenses are attributed to the reportable segments in one of three methods: (1) direct costs of the segment, (2) labor costs that can be attributed based upon time tracking for individual projects, or (3) costs that are allocated. Allocated costs are generally marketing and sales related activities.

Segment Adjusted EBITDA is the measure reported to the CODM for purposes of making decisions on allocating resources and assessing the performance of the Company’s segments, including budget and forecast-to-actual variances, and, therefore, Segment Adjusted EBITDA is presented in conformity with ASC 280, Segment Reporting. Segment Adjusted EBITDA is defined as earnings from operations before interest, income tax expense (benefit), depreciation and amortization (“EBITDA”) adjusted to exclude net other income (expense).

Corporate and unallocated expenses includes global facilities and information technology costs and long-term product roadmap expenses in addition to corporate overhead costs that are not allocated to reportable segments. The overhead costs relate to human resources, finance, legal, accounting, and merger and acquisition activity. These costs along with depreciation and amortization and stock-based compensation are not considered when management evaluates segment performance.