CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
OPERATING ACTIVITIES
Net income		$ 56,900	$ 25,000	$ 60,900
Loss from discontinued operations, net of tax		(600)	(57,600)	0
Income from continuing operations		57,500	82,600	60,900
Adjustments to reconcile net income to net cash provided by operating activities:
Bridge loan facility fees		26,100	0	0
Depreciation and amortization		231,100	81,900	80,600
Employee share-based compensation expense		12,600	10,600	11,200
Financing costs amortization		17,200	2,900	8,300
Realized gain on equity method investment		0	(300)	0
Unrealized foreign currency transaction gain		(3,800)	(4,100)	(1,100)
Unrealized loss (gain) on investments in equity securities		14,400	(13,100)	(3,200)
Realized gain on investments in equity securities		0	0	(2,600)
Equity in (earnings) loss of unconsolidated affiliates		(2,700)	500	(300)
Deferred income tax benefit		(79,300)	(1,700)	(7,900)
Other non-cash operating activities		(4,100)	11,300	(4,800)
Changes in assets and liabilities, net of acquisitions:
Accounts receivable		(76,500)	(45,300)	(31,200)
Inventories		20,800	(48,700)	(78,100)
Unbilled contract revenues and other assets		(157,000)	(84,900)	(71,200)
Accounts payable and other liabilities	[1]	236,700	61,200	(10,400)
Customer advances and billings in excess of contract revenue		(58,200)	27,900	28,500
Net Cash Provided By (Used In) Continuing Operating Activities		234,800	80,800	(21,300)
Net Cash Used In Discontinued Operating Activities		(67,600)	0	0
Net Cash Provided By (Used In) Operating Activities		167,200	80,800	(21,300)
INVESTING ACTIVITIES
Acquisition of business, net of cash acquired		(4,322,300)	(25,800)	(205,100)
Proceeds from sale of businesses, net of cash divested		474,800	0	0
Capital expenditures		(135,600)	(74,200)	(52,700)
Investments		(11,600)	(9,900)	(103,900)
Cash received from settlement of cross-currency swap agreement		0	9,400	0
Proceeds from sale of assets		8,600	0	0
Government grants and other		(1,400)	(1,100)	500
Net Cash Used In Continuing Investing Activities		(3,987,500)	(101,600)	(361,200)
Net Cash Used In Discontinued Investing Activities		(2,600)	0	0
Net Cash Used In Investing Activities		(3,990,100)	(101,600)	(361,200)
FINANCING ACTIVITIES
Borrowings on senior secured and senior unsecured notes		0	1,940,000	0
Borrowings on credit facilities		1,895,100	635,300	1,361,100
Repayments on credit facilities		(1,901,200)	(1,128,200)	(873,600)
Borrowings on term loan		1,747,300	0	0
Repayments on term loan		(158,300)	0	(103,100)
Payments for debt issuance costs		(136,200)	(4,700)	(3,000)
Payment of contingent consideration		(4,400)	0	0
Proceeds from issuance of common stock, net		11,700	675,500	0
Proceeds from issuance of preferred stock, net		0	388,400	0
Payments for equity issuance costs		0	(700)	0
Proceeds from exercise of stock options		1,000	2,200	6,900
Common stock repurchases from share-based compensation plans		(3,000)	(3,600)	(6,400)
Dividend distribution to noncontrolling interests		(12,200)	0	0
Dividends paid on mandatory convertible preferred stock		(27,300)	0	0
Net Cash Provided By Financing Activities		1,412,500	2,504,200	381,900
Effect of exchange rate changes on cash and cash equivalents		6,200	(500)	(3,100)
Net decrease in cash, cash equivalents, restricted cash, and restricted cash equivalents		(2,404,200)	2,482,900	(3,700)
Cash, cash equivalents, restricted cash, and restricted cash equivalents at beginning of period		2,605,300	122,400	126,100
CASH, CASH EQUIVALENTS, RESTRICTED CASH, AND RESTRICTED CASH EQUIVALENTS AT END OF PERIOD		$ 201,100	$ 2,605,300	$ 122,400

[1] Includes $37.0 of acquisition related financing fees for the year ended December 31, 2022.