Accounting Policies and Practices (Policies)	3 Months Ended
Mar. 31, 2023
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited Condensed Consolidated Financial Statements have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) for interim financial information and should be read in conjunction with the Consolidated Financial Statements contained in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2022, filed with the Securities and Exchange Commission (“SEC”) on March 1, 2023. In the opinion of management, all adjustments, including normal recurring adjustments, considered necessary for a fair presentation have been included. All significant intercompany transactions and balances have been eliminated upon consolidation. The results of operations for interim periods are not necessarily indicative of the results to be expected for future quarters or for the full fiscal year ending December 31, 2023.
Segment Reporting	Segment Reporting Effective January 1, 2023, the Company's former Hosted business revenues and gross margin are reported in Other as the business is no longer core to the Company’s operations. There is no change in composition among the Employer Solutions and Professional Services segments. Additionally, the Company changed its measure of segment profit and loss that is reported to the chief operating decision maker for purposes of making decisions about allocating resources to the Company’s segments and assessing business performance. See Note 12 “Segment Reporting” for additional information.
Use of Estimates	Use of Estimates The preparation of the accompanying Condensed Consolidated Financial Statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosures of contingent assets and liabilities at the date of the financial statements, and the reported amounts of reserves and expenses. These estimates and assumptions are based on management’s best estimates and judgments. Management evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors, including the current economic environment. Management believes its estimates to be reasonable given the current facts available. Management adjusts such estimates and assumptions when facts and circumstances dictate. Illiquid credit markets, volatile equity markets, and foreign currency exchange rate movements increase the uncertainty inherent in such estimates and assumptions. As future events and their effects cannot be predicted with certainty, actual results could differ significantly from these estimates. Changes in estimates resulting from continuing changes in the economic environment would, if applicable, be reflected in the financial statements in future periods.
Tax Receivable Agreement	Tax Receivable Agreement In connection with the Business Combination, we entered into a Tax Receivable Agreement (the “TRA”) with certain of our pre-Business Combination owners that provides for the payment by Alight to such owners of 85% of the benefits that Alight is deemed to realize as a result of the Company’s share of existing tax basis acquired in the Business Combination and other tax benefits related to entering into the TRA. The Company accounts for the TRA as a liability at fair value and is subject to remeasurement at each balance sheet date. Any change in fair value is recognized within the Condensed Consolidated Statements of Comprehensive Income (Loss). Subsequent to the Business Combination, upon equity exchanges of the noncontrolling interests, the Company records obligations under the TRA at the gross undiscounted amount of the expected future payments as an increase to the liability with an offset to Additional paid-in capital.
New Accounting Pronouncements	New Accounting Pronouncements There are no recently issued accounting pronouncements that are expected to have a material impact upon our Condensed Consolidated Financial Statements.
Fair Value Measurement	Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The accounting standards related to fair value measurements include a hierarchy for information and valuations used in measuring fair value that is broken down into three levels based on reliability, as follows: • Level 1 – observable inputs such as quoted prices in active markets for identical assets and liabilities; • Level 2 – inputs other than quoted prices for identical assets in active markets that are observable either directly or indirectly; and • Level 3 – unobservable inputs in which there is little or no market data which requires the use of valuation techniques and the development of assumptions.

Segment Reporting

Effective January 1, 2023, the Company's former Hosted business revenues and gross margin are reported in Other as the business is no longer core to the Company’s operations. There is no change in composition among the Employer Solutions and Professional Services segments. Additionally, the Company changed its measure of segment profit and loss that is reported to the chief operating decision maker for purposes of making decisions about allocating resources to the Company’s segments and assessing business performance. See Note 12 “Segment Reporting” for additional information.

Tax Receivable Agreement

In connection with the Business Combination, we entered into a Tax Receivable Agreement (the “TRA”) with certain of our pre-Business Combination owners that provides for the payment by Alight to such owners of 85% of the benefits that Alight is deemed to realize as a result of the Company’s share of existing tax basis acquired in the Business Combination and other tax benefits related to entering into the TRA. The Company accounts for the TRA as a liability at fair value and is subject to remeasurement at each balance sheet date. Any change in fair value is recognized within the Condensed Consolidated Statements of Comprehensive Income (Loss).

Subsequent to the Business Combination, upon equity exchanges of the noncontrolling interests, the Company records obligations under the TRA at the gross undiscounted amount of the expected future payments as an increase to the liability with an offset to Additional paid-in capital.

Fair Value Measurement

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The accounting standards related to fair value measurements include a hierarchy for information and valuations used in measuring fair value that is broken down into three levels based on reliability, as follows:

•

Level 1 – observable inputs such as quoted prices in active markets for identical assets and liabilities;

•

Level 2 – inputs other than quoted prices for identical assets in active markets that are observable either directly or indirectly; and

•

Level 3 – unobservable inputs in which there is little or no market data which requires the use of valuation techniques and the development of assumptions.