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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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