Segment Reporting - Schedule of Current Reportable and Recast of Segments by Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Revenue
Revenue	$ 548	$ 559
Less
Cost of sales	351	356
Depreciation and amortization	26	21
Gross Profit	171	182
Selling, general and administrative	104	146
Depreciation and intangible amortization	75	76
Interest expense	22	31
Net Income (Loss) From Continuing Operations	(17)	(121)
Employer Solutions
Revenue
Revenue	548	559
Less
Stock Based Compensation	3	5
Depreciation and amortization	26	21
Gross Profit	171	182
Selling, general and administrative	97	108
Restructuring	4	15
Stock Based Compensation	3	23
Depreciation and intangible amortization	75	76
Interest expense	22	31
Other segment item	(13)	50
Net Income (Loss) From Continuing Operations	(17)	(121)
Employer Solutions | Technology
Less
Cost of sales	76	82
Employer Solutions | Delivery, Customer Care, and Other
Less
Cost of sales	272	269
Employer Solutions | Recurring
Revenue
Revenue	520	521
Employer Solutions | Project
Revenue
Revenue	$ 28	$ 38