Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Cash Flows [Abstract]
Cash and cash equivalents at beginning of year	$ 439,272	$ 746,724
Cash flows from operating activities:
Net (loss) income	281,547	117,698
Adjustments to reconcile net income to cash flows from operating activities:
Depreciation and amortization	66,574	62,260
Gain (Loss) on Disposition of Business	8,400	0
Stock-based compensation and other	4,245	2,560
Equity in net income of unconsolidated investments (net of tax)	(62,436)	(16,511)
Dividends received from unconsolidated investments and nonmarketable securities	39,168	4,950
Pension and postretirement benefit	(4,250)	(4,226)
Pension and postretirement contributions	(3,890)	(15,329)
Unrealized gain on investments in marketable securities	1,469	(1,762)
Loss on early extinguishment of debt	0	27,798
Deferred income taxes	27,747	(19,384)
Working capital changes	(219,397)	(49,185)
Non-cash transfer of 40% value of construction in progress of Kemerton plant to MRL	65,100	43,223
Other, net	1,899	5,857
Net cash provided by operating activities	206,176	157,949
Cash flows from investing activities:
Capital expenditures	(231,698)	(179,683)
Sales of marketable securities, net	3,751	5,245
Investments in equity and other corporate investments	(146)	(286)
Net cash used in investing activities	(228,093)	(174,724)
Cash flows from financing activities:
Proceeds from issuance of common stock	0	1,453,888
Repayments of long-term debt and credit agreements	0	(1,174,980)
Proceeds from borrowings of credit agreements	280,000	0
-166615000	(166,615)	(325,159)
Fees related to early extinguishment of debt	0	(23,719)
Dividends paid to shareholders	(45,637)	(41,130)
Dividends paid to noncontrolling interests	0	(26,219)
Proceeds from exercise of stock options	419	1,183
Withholding taxes paid on stock-based compensation award distributions	(10,422)	(6,860)
Other	(126)	(253)
Net cash provided by (used in) financing activities	57,619	(143,249)
Net effect of foreign exchange on cash and cash equivalents	(11,649)	(16,841)
Increase (decrease) in cash and cash equivalents	24,053	(176,865)
Cash and cash equivalents at end of period	$ 463,325	$ 569,859