Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Consolidated Statements of Operations and Comprehensive Income [Abstract]
Revenue	$ 1,843	$ 1,780	$ 1,662
Cost of services rendered	852	895	952
Gross Profit	991	885	710
Selling and administrative expenses	612	581	521
Depreciation and amortization expense	39	37	34
Goodwill and intangibles impairment	0	0	14
Restructuring charges	8	16	20
Interest expense	40	40	31
Interest and net investment income	(20)	(16)	(4)
Loss on extinguishment of debt	3	0	0
Income before Income Taxes	309	229	93
Provision for income taxes	74	57	22
Net Income	235	171	71
Other Comprehensive (Loss) Income, Net of Income Taxes:
Unrealized (loss) gain on derivative instruments, net of income taxes	(6)	(3)	27
Total Other Comprehensive (Loss) Income, Net of Income Taxes	(6)	(3)	27
Comprehensive Income	$ 229	$ 169	$ 98
Earnings per Share:
Basic	$ 3.05	$ 2.13	$ 0.87
Diluted	$ 3.01	$ 2.12	$ 0.87
Weighted-average Common Shares Outstanding:
Basic	77.0	80.5	81.8
Diluted	78.0	80.9	82.0