Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended				6 Months Ended		9 Months Ended	12 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024	Sep. 30, 2024	Dec. 31, 2024	Dec. 31, 2023
Statement of Cash Flows [Abstract]
Cash and cash equivalents at beginning of year		$ 1,192,230		$ 889,900	$ 1,192,230	$ 889,900	$ 889,900	$ 889,900
Cash flows from operating activities:
Net income (loss)	$ 35,193		$ (176,594)		84,491	(159,947)
Adjustments to reconcile net income (loss) to cash flows from operating activities:
Depreciation and amortization	168,731		138,279		330,485	262,030
Non-cash restructuring and asset write-offs					0	276,013
Stock-based compensation and other					17,068	15,439
Equity in net income of unconsolidated investments (net of tax)	(78,258)		(286,878)		(142,544)	(467,378)
Dividends received from unconsolidated investments and nonmarketable securities					67,765	270,926
Pension and postretirement expense					3,504	2,529
Pension and postretirement contributions					(9,934)	(9,428)
Realized loss on investments in marketable securities					0	33,746
Unrealized loss on investments in marketable securities					4,984	23,777
Deferred income taxes					(38,907)	(129,087)
Working capital changes				(48,600)	(96,762)	468,594	830,851
Noncurrent liability changes and other, net		358,970		(27,265)	318,030	(122,066)	(34,211)	(116,035)	$ (101,274)
Net cash provided by operating activities		547,207		97,485	538,180	465,148	692,255	687,876	1,326,583
Cash flows from investing activities:
Capital expenditures				(583,042)	(302,252)	(1,034,593)	(1,337,719)	(1,680,529)	(2,154,542)
Proceeds from sale of property and equipment					23,751	0
Proceeds from sale of available for sale debt securities					288,000	0
Proceeds from settlement of foreign currency forward contracts, net		50,245		18,224	171,262	12,991	(1,956)	(15,595)	221,849
Sales of marketable securities, net					2,971	82,578
Investments in equity investments and nonmarketable securities					(120)	(148)
Net cash provided by (used in) investing activities		(129,058)		(479,999)	183,612	(939,172)	(1,256,241)	(1,584,772)	(2,564,572)
Cash flows from financing activities:
Proceeds from issuance of mandatory convertible preferred stock, net of issuance costs					0	2,236,750
Repayments of long-term debt and credit agreements					(29,103)	(56,453)
Proceeds from borrowings of long-term debt and credit agreements					19,488	56,453
Other debt repayments, net					(2,427)	(627,390)
Dividends paid to common shareholders					(95,244)	(93,916)
Dividends paid to mandatory convertible preferred shareholders					(83,375)	(39,376)
Dividends paid to noncontrolling interests					(18,169)	(18,137)
Proceeds from exercise of stock options					1,186	86
Withholding taxes paid on stock-based compensation award distributions					(2,941)	(10,677)
Other					(55)	(2,758)
Net cash (used in) provided by financing activities					(210,640)	1,444,582
Net effect of foreign exchange on cash and cash equivalents		$ 28,138		$ (8,873)	103,447	(30,231)	$ 3,989	(42,509)	4,836
Increase in cash and cash equivalents					614,599	940,327
Cash and cash equivalents at end of period	$ 1,806,829		$ 1,830,227		$ 1,806,829	$ 1,830,227		$ 1,192,230	$ 889,900