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Acquisitions Acquisitions (Details) - USD ($)
$ in Thousands
12 Months Ended
Oct. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Goodwill   $ 1,578,785 $ 1,567,169 $ 1,610,355
Mineral Resources Limited Wodgina Project        
Business Acquisition [Line Items]        
Cash payments related to joint venture   820,000    
Consideration transferred $ 1,300,000 1,323,566    
Cash payments related to joint venture, certain adjustments 22,500 23,566    
Total purchase price $ 1,300,000 1,323,566    
Inventories   33,900    
Other current assets   10,695    
Other assets   1,000    
Current liabilities   (10,695)    
Long-term debt   (55,806)    
Other noncurrent liabilities   (23,296)    
Total identifiable net assets   1,291,804    
Goodwill   31,762    
Total net assets acquired   1,323,566    
Lithium Hydroxide Conversion Assets | Mineral Resources Limited Wodgina Project        
Business Acquisition [Line Items]        
Consideration transferred   480,000    
Total purchase price   480,000    
Building and improvements | Mineral Resources Limited Wodgina Project        
Business Acquisition [Line Items]        
Property, plant and equipment   22,200    
Machinery and equipment | Mineral Resources Limited Wodgina Project        
Business Acquisition [Line Items]        
Property, plant and equipment   163,806    
Mineral rights and reserves | Mineral Resources Limited Wodgina Project        
Business Acquisition [Line Items]        
Property, plant and equipment   1,046,300    
Construction in progress | Mineral Resources Limited Wodgina Project        
Business Acquisition [Line Items]        
Property, plant and equipment   $ 103,700