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Derivative Instruments Derivative Instruments Net Investment Hedges (Details 1)
$ 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 ($)
Dec. 31, 2017
USD ($)
Feb. 29, 2012
Derivative Instruments, Gain (Loss) [Line Items]            
Payments to increase investment in Samsung Bioepis     $ 0.0 $ 676.6 $ 0.0  
Unrealized gain (loss) on net investment hedge in AOCI     $ 0.5 (27.3) $ 113.0  
Net Investment Hedge            
Derivative Instruments, Gain (Loss) [Line Items]            
Forward contracts duration     10 months      
Unrealized gain (loss) on net investment hedge in AOCI     $ 1.5 3.8    
Derivative qualifying as hedge, excluded component, after tax $ 7.3   2.9 7.3    
Gains (losses) on net investment hedge     25.3 (3.8)    
Gains (losses) on net investment hedge, excluded component     3.3 0.0    
Other income (expense) | Net Investment Hedge            
Derivative Instruments, Gain (Loss) [Line Items]            
Net gains (losses) in net income of foreign currency forward contracts, excluded component     $ 7.0 $ 1.5    
Samsung Bioepis            
Derivative Instruments, Gain (Loss) [Line Items]            
Samsung Bioepis, ownership percentage before additional purchase transaction 5.00%     5.00%    
Samsung Bioepis, ownership percentage     49.90%     15.00%
Payments to increase investment in Samsung Bioepis $ 676.6 ₩ 759.5