Segment Reporting - Schedule of Current Reportable Segments by Segment Profit (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Segment Profit		$ 142	$ 133
Share-based compensation		33	2
Transaction and integration expenses	[1]	6
Non-recurring professional expenses	[2]		9
Restructuring		6	7
Other	[3]	3	(5)
Depreciation		17	24
Intangible amortization expense		79	50
Operating (Loss) Income		(2)	46
Gain from change in fair value of financial instruments		(13)
Gain from change in fair value of tax receivable agreement		(5)
Interest expense		29	62
Other (income) expense, net		(1)	8
Loss Before Income Tax Expense (Benefit)		(12)	(24)
Employer Solutions
Segment Reporting Information [Line Items]
Segment Profit		$ 142	136
Hosted Business
Segment Reporting Information [Line Items]
Segment Profit			$ (3)

[1] Transaction and integration expenses related to acquisition activity.

[2] Non-recurring professional expenses includes external advisor and legal costs related to the Company’s Business Combination completed in 2021.

[3] For the three months ended March 31, 2022, other primarily includes expenses related to debt refinancing, offset by Other income, net. For the three months ended March 31, 2021, other includes long-term incentive expenses, offset by Other expense, net.