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Financial Instruments (Details Textual 2)
$ in Millions, ₩ in Billions
3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
KRW (₩)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2019
KRW (₩)
Dec. 31, 2018
KRW (₩)
Feb. 29, 2012
USD ($)
Feb. 29, 2012
KRW (₩)
Business Acquisition [Line Items]                  
Sale of Ionis common stock     $ 479.3 $ 0.0 $ 0.0        
Payments to increase investment in Samsung Bioepis     0.0 676.6 $ 0.0        
Strategic Investments                  
Business Acquisition [Line Items]                  
Strategic investment portfolio $ 676.3   393.9 $ 676.3          
Ionis Pharmaceuticals                  
Business Acquisition [Line Items]                  
Sale of Ionis common stock     $ 382.0            
Samsung Bioepis                  
Business Acquisition [Line Items]                  
Samsung Bioepis, ownership percentage before additional purchase transaction 5.00%     5.00%     5.00%    
Samsung Bioepis, ownership percentage     49.90%     49.90%   15.00% 15.00%
Payments to increase investment in Samsung Bioepis $ 676.6 ₩ 759.5              
Investment in Samsung Bioepis $ 680.6   $ 580.2 $ 680.6   ₩ 670.8 ₩ 759.5 $ 45.0 ₩ 49.5