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Investments Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Oct. 31, 2019
Schedule of Investments [Line Items]
Equity in net income of unconsolidated investments (net of tax)		$ 127,521	$ 129,568	$ 89,264
Dividends received from unconsolidated investments		88,161	71,746	57,415
Investments in unconsolidated joint ventures exceeded the amount of underlying equity in net assets	$ 32,100	32,100	15,300
Proceeds from sale of joint venture	11,000	11,000	0	0
Marketable equity securities	$ 37,109	$ 37,109	33,637
Windfield Holdings
Schedule of Investments [Line Items]
Ownership percentage	49.00%	49.00%
Carrying value of unconsolidated investment	$ 479,600	$ 479,600	397,200
Other Variable Interest Entities Excluding Windfield Holdings
Schedule of Investments [Line Items]
Carrying value of unconsolidated investment	$ 8,000	$ 8,000	7,600
Jordan Bromine Company Limited
Schedule of Investments [Line Items]
Ownership percentage	50.00%	50.00%
Significant Unconsolidated Joint Venture
Schedule of Investments [Line Items]
Investment in significant unconsolidated joint ventures	$ 587,600	$ 587,600	513,800
Equity in net income of unconsolidated investments (net of tax)		126,000	128,000	88,800
Undistributed earnings from equity method investees	$ 255,400	255,400	216,900
Dividends received from unconsolidated investments		$ 87,400	$ 71,000	$ 56,400
Windfield Holdings
Schedule of Investments [Line Items]
Ownership percentage	49.00%	49.00%	49.00%	49.00%
Saudi Organometallic Chemicals Company LLC [Domain] | Other expenses, net
Schedule of Investments [Line Items]
Gain on Sale of Investments		$ 7,200
Benefit Protection Trust
Schedule of Investments [Line Items]
Marketable equity securities	$ 32,400	$ 32,400	$ 28,700
Mineral Resources Limited Wodgina Project
Schedule of Investments [Line Items]
Interest percentage acquired					60.00%

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