Financial Instruments	9 Months Ended
Sep. 30, 2024
Financial Instruments [Abstract]
Financial Instruments	14. Financial Instruments Seller Earnouts Upon completion of the Business Combination, the equity owners of Alight Holdings received an earnout in the form of non-voting shares of Class B-1 and Class B-2 Common Stock, which automatically convert into Class A Common Stock if, at any time during the seven years following the Closing Date, certain criteria are achieved. See Note 9 “Stockholders’ Equity” for additional information regarding the Seller Earnouts. The portion of the Seller Earnouts related to employee compensation was accounted for as share-based compensation. As all employee compensation associated with the Seller Earnouts was ultimately vested on July 2, 2024, no portion of the Seller Earnout as of September 30, 2024 is accounted for as share-based compensation. See Note 10 “Share-Based Compensation Expense” for additional information. As of September 30, 2024, all of the remaining Seller Earnouts were accounted for as a contingent consideration liability at fair value within Financial instruments on the Condensed Consolidated Balance Sheets because the Seller Earnouts do not meet the criteria for classification within equity. This liability is subject to remeasurement at each balance sheet date. At September 30, 2024 and December 31, 2023, the Seller Earnouts had a fair value of $62 million and $95 million, respectively. For the three months ended September 30, 2024, and September 30, 2023, the fair value remeasurement of the Seller Earnouts was a gain of $3 million and $37 million, respectively. For the nine months ended September 30, 2024 and 2023, the fair value remeasurement of the Seller Earnouts was a gain of $32 million and $24 million, respectively. Gains or losses related to the remeasurement of Seller Earnouts are recorded in (Gain) Loss from change in fair value of financial instruments within the accompanying Condensed Consolidated Statements of Comprehensive Income (Loss). The fair value of the Class B-1 and B-2 Seller Earnouts, and, prior to the Class Z vesting on July 2, 2024, the Class Z-B-1 and Z-B-2 contingent consideration instruments, is determined using Monte Carlo simulation and Option Pricing Methods (Level 3 inputs, see Note 16 "Fair Value Measurements"). Significant unobservable inputs are used in the assessment of fair value, including the following assumptions: volatility of 45%, risk-free interest rate of 3.58%, expected holding period of 3.76 years and probability assessments based on the likelihood of reaching the performance targets defined in the Business Combination. An increase in the risk-free interest rate or expected volatility would result in an increase in the fair value measurement of the Seller Earnouts and vice versa. As discussed in Note 9 “Stockholders’ Equity”, in connection with the ultimate forfeiture of the shares of unvested Class A, unvested Class B-1, and unvested Class B-2 common stock issued to participating management holders on July 2, 2024, all Class Z instruments were ultimately settled resulting in the re-allocation of the forfeited compensatory Class A, Class B-1 and Class B2 instruments. The Class Z instruments are also accounted for as a contingent consideration liability at fair value within Financial instruments on the Condensed Consolidated Balance Sheets because these instruments do not meet the criteria for classification within equity. The fair value of the Class Z-A contingent consideration was determined using the ending share price as of the last day of each quarter until settlement on July 2, 2024, resulting in the issuance of 1.5 million shares of Class A common stock and units at the $7.09 stock price on that date. At September 30, 2024, the Class Z-A contingent consideration was no longer outstanding. As of December 31, 2023, the Class Z-A contingent consideration had a fair value of $13 million. For the three months ended September 30, 2024, the expense recorded by the Company as a result of the forfeiture of unvested management equity relating to the consideration that will be re-allocated to the holders of Class Z instruments upon vesting was not material. For the three months ended September 30, 2023, the expense recorded by the Company as a result of the forfeiture of unvested management equity relating to the consideration that will be re-allocated to the holders of Class Z instruments upon vesting was a loss of $1 million. For the nine months ended September 30, 2024 and 2023, the Company recorded a gain of $2 million and a loss of $13 million, respectively, in (Gain) Loss from change in fair value of financial instruments in the Condensed Consolidated Statements of Comprehensive Income (Loss) as a result of the forfeiture of unvested management equity that was ultimately re-allocated to the holders of Class Z instruments on July 2, 2024. See Note 9 “Stockholders’ Equity” for additional information regarding these instruments. Additional Seller Note As disclosed above in Note 1 “Basis of Presentation and Nature of Business”, on July 12, 2024, the Company closed on its previously announced sale of Strada. As part of the sale, the Company received a note with an aggregate principal amount of up to $150 million (the “Additional Seller Note”) with an initial fair value of $52 million as of July 12, 2024 to be issued by the Note Issuer. See Note 4 “Discontinued Operations” for additional information. The Additional Seller Note is considered a level 3 recurring fair value measurement. At September 30, 2024, the Additional Seller Note had a fair value of $72 million. For each of the three and nine months ended September 30, 2024, the Company recorded a gain of $20 million from the fair value remeasurement of the Additional Seller Note. Gains or losses related to the recurring fair value remeasurement of the Additional Seller Note are recorded in (Gain) Loss from change in fair value of financial instruments within the accompanying Condensed Consolidated Statements of Comprehensive Income (Loss). The fair value of the Additional Seller Note is determined using a variation of the income approach (Level 3 inputs, see Note 16 "Fair Value Measurements"). Significant unobservable inputs are used in the assessment of fair value, including the following assumptions: expected Adjusted EBITDA, expected maturity of the Additional Seller Note, and Strada's estimated cost of debt, based on the likelihood of reaching the performance targets defined in the Purchase Agreement.

Upon completion of the Business Combination, the equity owners of Alight Holdings received an earnout in the form of non-voting shares of Class B-1 and Class B-2 Common Stock, which automatically convert into Class A Common Stock if, at any time during the seven years following the Closing Date, certain criteria are achieved. See Note 9 “Stockholders’ Equity” for additional information regarding the Seller Earnouts.

The portion of the Seller Earnouts related to employee compensation was accounted for as share-based compensation. As all employee compensation associated with the Seller Earnouts was ultimately vested on July 2, 2024, no portion of the Seller Earnout as of September 30, 2024 is accounted for as share-based compensation. See Note 10 “Share-Based Compensation Expense” for additional information.

As of September 30, 2024, all of the remaining Seller Earnouts were accounted for as a contingent consideration liability at fair value within Financial instruments on the Condensed Consolidated Balance Sheets because the Seller Earnouts do not meet the criteria for classification within equity. This liability is subject to remeasurement at each balance sheet date. At September 30, 2024 and December 31, 2023, the Seller Earnouts had a fair value of $62 million and $95 million, respectively. For the three months ended September 30, 2024, and September 30, 2023, the fair value remeasurement of the Seller Earnouts was a gain of $3 million and $37 million, respectively. For the nine months ended September 30, 2024 and 2023, the fair value remeasurement of the Seller Earnouts was a gain of $32 million and $24 million, respectively. Gains or losses related to the remeasurement of Seller Earnouts are recorded in (Gain) Loss from change in fair value of financial instruments within the accompanying Condensed Consolidated Statements of Comprehensive Income (Loss).

The fair value of the Class B-1 and B-2 Seller Earnouts, and, prior to the Class Z vesting on July 2, 2024, the Class Z-B-1 and Z-B-2 contingent consideration instruments, is determined using Monte Carlo simulation and Option Pricing Methods (Level 3 inputs, see Note 16 "Fair Value Measurements"). Significant unobservable inputs are used in the assessment of fair value, including the following assumptions: volatility of 45%, risk-free interest rate of 3.58%, expected holding period of 3.76 years and probability assessments based on the likelihood of reaching the performance targets defined in the Business Combination. An increase in the risk-free interest rate or expected volatility would result in an increase in the fair value measurement of the Seller Earnouts and vice versa.

As discussed in Note 9 “Stockholders’ Equity”, in connection with the ultimate forfeiture of the shares of unvested Class A, unvested Class B-1, and unvested Class B-2 common stock issued to participating management holders on July 2, 2024, all Class Z instruments were ultimately settled resulting in the re-allocation of the forfeited compensatory Class A, Class B-1 and Class B2 instruments. The Class Z instruments are also accounted for as a contingent consideration liability at fair value within Financial instruments on the Condensed Consolidated Balance Sheets because these instruments do not meet the criteria for classification within equity. The fair value of the Class Z-A contingent consideration was determined using the ending share price as of the last day of each quarter until settlement on July 2, 2024, resulting in the issuance of 1.5 million shares of Class A common stock and units at the $7.09 stock price on that date.

At September 30, 2024, the Class Z-A contingent consideration was no longer outstanding. As of December 31, 2023, the Class Z-A contingent consideration had a fair value of $13 million. For the three months ended September 30, 2024, the expense recorded by the Company as a result of the forfeiture of unvested management equity relating to the consideration that will be re-allocated to the holders of Class Z instruments upon vesting was not material. For the three months ended September 30, 2023, the expense recorded by the Company as a result of the forfeiture of unvested management equity relating to the consideration that will be re-allocated to the holders of Class Z instruments upon vesting was a loss of $1 million. For the nine months ended September 30, 2024 and 2023, the Company recorded a gain of $2 million and a loss of $13 million, respectively, in (Gain) Loss from change in fair value of financial instruments in the Condensed Consolidated Statements of Comprehensive Income (Loss) as a result of the forfeiture of unvested management equity that was ultimately re-allocated to the holders of Class Z instruments on July 2, 2024. See Note 9 “Stockholders’ Equity” for additional information regarding these instruments.

As disclosed above in Note 1 “Basis of Presentation and Nature of Business”, on July 12, 2024, the Company closed on its previously announced sale of Strada. As part of the sale, the Company received a note with an aggregate principal amount of up to $150 million (the “Additional Seller Note”) with an initial fair value of $52 million as of July 12, 2024 to be issued by the Note Issuer. See Note 4 “Discontinued Operations” for additional information. The Additional Seller Note is considered a level 3 recurring fair value measurement. At September 30, 2024, the Additional Seller Note had a fair value of $72 million. For each of the three and nine months ended September 30, 2024, the Company recorded a gain of $20 million from the fair value remeasurement of the Additional Seller Note. Gains or losses related to the recurring fair value remeasurement of the Additional Seller Note are recorded in (Gain) Loss from change in fair value of financial instruments within the accompanying Condensed Consolidated Statements of Comprehensive Income (Loss).

The fair value of the Additional Seller Note is determined using a variation of the income approach (Level 3 inputs, see Note 16 "Fair Value Measurements"). Significant unobservable inputs are used in the assessment of fair value, including the following assumptions: expected Adjusted EBITDA, expected maturity of the Additional Seller Note, and Strada's estimated cost of debt, based on the likelihood of reaching the performance targets defined in the Purchase Agreement.