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Share-Based Compensation - Information for Restricted Stock Units under Equity Incentive Plan (Details) - $ / shares
12 Months Ended
Feb. 01, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Weighted Average Grant Date Fair Value        
Granted (usd per share)   $ 243.65 $ 294.50 $ 181.23
Market price of stock award   $ 251.04    
Restricted stock units        
Shares        
Nonvested, beginning of period (in shares)   597,296    
Granted (in shares)   543,938    
Vested (in shares)   (227,707)    
Forfeited (in shares)   (65,555)    
Nonvested, end of period (in shares)   847,972 597,296  
Weighted Average Grant Date Fair Value        
Nonvested, beginning of period (usd per share)   $ 194.48    
Granted (usd per share)   243.65    
Vested (usd per share)   154.96    
Forfeited (usd per share)   195.69    
Nonvested, end of period (usd per share)   $ 236.54 $ 194.48  
Vesting period of stock award   5 years    
Retention Plan for SVB Leerink | Restricted stock units        
Shares        
Granted (in shares) 125,160      
Weighted Average Grant Date Fair Value        
Market price of stock award $ 238.28