Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Cash Flows [Abstract]
Cash and cash equivalents at beginning of year	$ 889,900	$ 1,499,142
Cash flows from operating activities:
Net income	16,647	1,276,703
Adjustments to reconcile net income to cash flows from operating activities:
Depreciation and amortization	123,751	87,271
Stock-based compensation and other	9,317	10,540
Equity in net income of unconsolidated investments (net of tax)	(180,500)	(396,188)
Dividends received from unconsolidated investments and nonmarketable securities	50,756	547,552
Pension and postretirement expense	1,273	1,954
Pension and postretirement contributions	(4,824)	(2,825)
Realized loss on investments in marketable securities	33,746	0
Unrealized loss (gain) on investments in marketable securities	6,737	(45,732)
Deferred income taxes	116,447	14,098
Working capital changes	(52,320)	(764,071)
Other, net	(23,076)	(8,322)
Net cash provided by operating activities	97,954	720,980
Cash flows from investing activities:
Capital expenditures	(579,322)	(415,608)
Sales (purchases) of marketable securities, net	84,893	(122,267)
Investments in equity investments and nonmarketable securities	(74)	(1,133)
Net cash used in investing activities	(494,503)	(539,008)
Cash flows from financing activities:
Proceeds from issuance of mandatory convertible preferred stock, net of issuance costs	2,236,750	0
Repayments of long-term debt and credit agreements	(29,019)	0
Proceeds from borrowings of long-term debt and credit agreements	29,019	0
Other debt repayments, net	(620,753)	(713)
Dividends paid to common shareholders	(46,908)	(46,282)
Dividends paid to noncontrolling interests	0	(53,145)
Proceeds from exercise of stock options	86	81
Withholding taxes paid on stock-based compensation award distributions	(10,619)	(18,617)
Other	(1,256)	0
Net cash provided by (used in) financing activities	1,557,300	(118,676)
Net effect of foreign exchange on cash and cash equivalents	5,162	24,296
Increase in cash and cash equivalents	1,165,913	87,592
Cash and cash equivalents at end of period	$ 2,055,813	$ 1,586,734