Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Cash flows from operating activities:
Net income	$ 77	$ 35	$ 69	$ 45	$ 112	$ 114
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	22		20		42	39
Amortization	59		55		119	105
Restructuring charges, net of cash paid					(2)	(10)
Deferred taxes					(1)	(1)
Share-based compensation expense					21	17
Profit-sharing expense					14	11
Non-cash lease expense					56	48
Net periodic pension cost					11	12
Other, net					2	(18)
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable					(12)	97
Contract assets					(77)	(48)
Inventories					(3)	(8)
Prepaid expenses and other current assets					(36)	(31)
Accounts payable					7	(53)
Accrued liabilities and income taxes payable					(56)	(108)
Contract liabilities					37	7
Other assets and liabilities					(89)	(56)
Net cash provided by operating activities					145	117
Cash flows from investing activities:
Acquisitions, net of cash acquired					(111)	(606)
Purchases of property and equipment					(39)	(44)
Proceeds from sales of property and equipment					10	27
Net cash used in investing activities					(140)	(623)
Cash flows from financing activities:
Proceeds from long-term borrowings					0	850
Payments on long-term borrowings					(4)	(334)
Repurchases of common stock					(75)	0
Proceeds from issuance of common shares					0	458
Conversion of Series B Preferred Stock					0	(600)
Payments of acquisition-related consideration					(2)	(2)
Restricted shares tendered for taxes					(20)	(11)
Other financing activities					0	(4)
Net cash (used in) provided by financing activities					(101)	357
Effect of foreign currency exchange rate change on cash, cash equivalents, and restricted cash					28	(5)
Net decrease in cash, cash equivalents, and restricted cash					(68)	(154)
Cash, cash equivalents, and restricted cash, beginning of period		$ 501		$ 480	501	480	$ 480
Cash, cash equivalents, and restricted cash, end of period	$ 433		$ 326		433	326	$ 501
Supplemental cash flow disclosures:
Cash paid for interest, net of interest income					70	76
Cash paid for income taxes, net of refunds					63	52
Accrued consideration issued in business combinations					9	9
Shares of common stock issued to profit sharing plan					24	18
Shares of common stock issued for conversion of Series B Preferred Stock					$ 0	$ 569