Stockholders' Equity - Schedule of Changes in Outstanding Stock (Details) - shares	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Shares Outstanding [Roll Forward]
Beginning balance (in shares)	28,800,000
Ending balance (in shares)	42,600,000	28,800,000
Treasury
Shares Outstanding [Roll Forward]
Beginning balance (in shares)	28,755,570	6,427,853	1,506,385
Shares repurchases (in shares)	13,881,417	22,327,717	4,921,468
Ending balance (in shares)	42,636,987	28,755,570	6,427,853
Class A
Shares Outstanding [Roll Forward]
Beginning balance (in shares)	531,703,862	507,567,678	470,756,961
Conversion of noncontrolling interest (in shares)	25,879	28,987,597	34,519,247
Shares granted upon vesting (in shares)	5,883,501	17,316,478	7,129,735
Issuance for compensation to non-employees (in shares)	209,800	159,826	83,203
Share repurchases (in shares)	(13,881,417)	(22,327,717)	(4,921,468)
Ending balance (in shares)	523,941,625	531,703,862	507,567,678
Class B-1
Shares Outstanding [Roll Forward]
Beginning balance (in shares)	4,978,807	4,951,235	4,990,453
Shares granted upon vesting (in shares)		63,868
Share forfeitures (in shares)	(23,510)	(36,296)	(39,218)
Ending balance (in shares)	4,955,297	4,978,807	4,951,235
Class B-2
Shares Outstanding [Roll Forward]
Beginning balance (in shares)	4,978,807	4,951,235	4,990,453
Shares granted upon vesting (in shares)		63,868
Share forfeitures (in shares)	(23,510)	(36,296)	(39,218)
Ending balance (in shares)	4,955,297	4,978,807	4,951,235
Class V
Shares Outstanding [Roll Forward]
Beginning balance (in shares)	510,237	28,962,218	63,481,465
Conversion of noncontrolling interest (in shares)	(25,879)	(28,987,597)	(34,519,247)
Shares granted upon vesting (in shares)		535,616
Ending balance (in shares)	484,358	510,237	28,962,218
Class Z
Shares Outstanding [Roll Forward]
Beginning balance (in shares)	0	3,420,215	5,595,577
Shares granted upon vesting (in shares)		(3,420,215)	(2,175,362)
Ending balance (in shares)	0	0	3,420,215
Unvested Common Class A Units
Shares Outstanding [Roll Forward]
Beginning balance (in shares)		3,321,260
Ending balance (in shares)			3,321,260

Alight, Inc. / Delaware 10-K