Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Cash flows from operating activities:
Net income	$ 45	$ 26
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	19	19
Amortization	50	55
Restructuring charges, net of cash paid	(8)	0
Share-based compensation expense	8	5
Profit-sharing expense	6	5
Non-cash lease expense	26	18
Net periodic pension cost (benefit)	4	(3)
Loss on extinguishment of debt, net	0	3
Other, net	(13)	(5)
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	128	96
Contract assets	(26)	(30)
Prepaid expenses and other current assets	(7)	(15)
Accounts payable	(86)	(47)
Accrued liabilities and income taxes payable	(128)	(112)
Contract liabilities	19	5
Other assets and liabilities	(30)	(21)
Net cash provided by (used in) operating activities	7	(1)
Cash flows from investing activities:
Acquisitions, net of cash acquired	(23)	(10)
Purchases of property and equipment	(22)	(21)
Proceeds from sales of property and equipment	23	4
Net cash used in investing activities	(22)	(27)
Cash flows from financing activities:
Net short-term debt	100	0
Proceeds from long-term borrowings	300	0
Payments on long-term borrowings	(2)	(202)
Repurchases of common stock	0	(12)
Conversion of Series B Preferred Stock	(600)	0
Restricted shares tendered for taxes	(11)	(2)
Net cash used in financing activities	(213)	(216)
Effect of foreign currency exchange rate change on cash, cash equivalents, and restricted cash	(4)	2
Net decrease in cash, cash equivalents, and restricted cash	(232)	(242)
Cash, cash equivalents, and restricted cash, beginning of period	480	607	$ 607
Cash, cash equivalents, and restricted cash, end of period	248	365	$ 480
Supplemental cash flow disclosures:
Cash paid for interest, net of interest income	36	27
Cash paid for income taxes, net of refunds	35	19
Accrued consideration issued in business combinations	5	1
Shares of common stock issued to profit sharing plan	18	14
Shares of common stock issued for conversion of Series B Preferred Stock	$ 569	$ 0