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Investments Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Feb. 28, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of Investments [Line Items]        
Equity in net income of unconsolidated investments (net of tax)   $ 84,487 $ 59,637 $ 27,978
Dividends received from unconsolidated investments   39,386 43,759 59,912
Investments in unconsolidated joint ventures exceeded the amount of underlying equity in net assets   13,800 (6,800)  
Excess amount paid for joint ventures remaining to be amortized   400 600  
Return of capital from unconsolidated investment   0 0 98,000
Termination of Tianqi Lithium Corporation option agreement $ 13,100 0    
Marketable equity securities   30,653 27,570  
Joint ventures   499,756 429,794  
Significant Unconsolidated Joint Venture        
Schedule of Investments [Line Items]        
Investment in significant unconsolidated joint ventures   479,100 404,600  
Equity in net income of unconsolidated investments (net of tax)   86,800 56,800 25,400
Undistributed earnings from equity method investees   127,500 99,400  
Dividends received from unconsolidated investments   $ 38,100 $ 42,100 $ 58,100
Windfield Holdings        
Schedule of Investments [Line Items]        
Ownership percentage   49.00% 49.00% 49.00%
Return of capital from unconsolidated investment       $ 98,000
Rockwood Lithium GmbH        
Schedule of Investments [Line Items]        
Ownership Percentage 100.00%      
Saudi Organometallic Chemicals Company        
Schedule of Investments [Line Items]        
Equity in net income of unconsolidated investments (net of tax)   $ 3,800    
Ownership percentage   50.00%    
Joint ventures   $ 4,500    
Benefit Protection Trust        
Schedule of Investments [Line Items]        
Marketable equity securities   $ 25,500 $ 22,000  
Windfield Holdings        
Schedule of Investments [Line Items]        
Ownership percentage   49.00%    
Carrying value of unconsolidated investment   $ 355,200 288,600  
Other Variable Interest Entities Excluding Windfield Holdings        
Schedule of Investments [Line Items]        
Carrying value of unconsolidated investment   $ 8,700 8,800  
Jordan Bromine Company Limited        
Schedule of Investments [Line Items]        
Ownership percentage   50.00%    
Rockwood Holdings, Inc.        
Schedule of Investments [Line Items]        
Utilization of inventory markup     $ 103,400  
Equity in net income of unconsolidated investments | Rockwood Holdings, Inc.        
Schedule of Investments [Line Items]        
Utilization of inventory markup       $ 27,100
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%