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Investments Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Feb. 28, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule of Investments [Line Items]        
Equity in net income of unconsolidated investments (net of tax)   $ 89,264 $ 84,487 $ 59,637
Dividends received from unconsolidated investments   57,415 39,386 43,759
Investments in unconsolidated joint ventures exceeded the amount of underlying equity in net assets   400 13,800  
Excess amount paid for joint ventures remaining to be amortized   100 400  
Termination of Tianqi Lithium Corporation option agreement $ 13,100   0  
Marketable equity securities   33,513 30,653  
Significant Unconsolidated Joint Venture        
Schedule of Investments [Line Items]        
Investment in significant unconsolidated joint ventures   466,100 479,100  
Equity in net income of unconsolidated investments (net of tax)   88,800 86,800 56,800
Undistributed earnings from equity method investees   159,900 127,500  
Dividends received from unconsolidated investments   $ 56,400 $ 38,100 $ 42,100
Windfield Holdings        
Schedule of Investments [Line Items]        
Ownership percentage   49.00% 49.00% 49.00%
Rockwood Lithium GmbH        
Schedule of Investments [Line Items]        
Ownership percentage 100.00%      
Benefit Protection Trust        
Schedule of Investments [Line Items]        
Marketable equity securities   $ 26,300 $ 25,500  
Windfield Holdings        
Schedule of Investments [Line Items]        
Ownership percentage   49.00%    
Carrying value of unconsolidated investment   $ 349,600 355,200  
Other Variable Interest Entities Excluding Windfield Holdings        
Schedule of Investments [Line Items]        
Carrying value of unconsolidated investment   $ 8,100 $ 8,700  
Jordan Bromine Company Limited        
Schedule of Investments [Line Items]        
Ownership percentage   50.00%    
Minimum | Rockwood Lithium GmbH        
Schedule of Investments [Line Items]        
Ownership percentage   20.00%    
Maximum | Rockwood Lithium GmbH        
Schedule of Investments [Line Items]        
Ownership percentage   30.00%