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Other Consolidated Financial Statement Detail - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]        
Increase to goodwill   $ 0 $ 117,500,000  
Unrealized gain (loss) on investments   (681,800,000) 150,100,000  
Realized investment gains (losses)   12,100,000 50,000,000.0  
Unrealized gains (losses) recognized during the period on equity securities   681,800,000 150,100,000 $ 128,500,000
Other long-term liabilities   1,329,600,000 1,348,900,000  
Accrued income taxes   709,900,000 803,300,000  
Denali and Sangamo        
Business Acquisition [Line Items]        
Unrealized gains (losses) recognized during the period on equity securities   703,900,000    
Solothurn        
Business Acquisition [Line Items]        
Construction in progress   12,400,000 $ 50,000,000.0  
Fumarate | Fumapharm AG | Twenty billion        
Business Acquisition [Line Items]        
Increase to goodwill $ 300,000,000.0      
Cumulative sales level 20,000,000,000.0     20,000,000,000.0
Fumarate | Fumapharm AG | Each additional one billion up to twenty billion        
Business Acquisition [Line Items]        
Cumulative sales level $ 20,000,000,000.0 $ 20,000,000,000.0   $ 20,000,000,000.0