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Stockholders' Equity - Restricted Stock Units (Details) - USD ($)
$ / shares in Units, shares in Millions
6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Unvested restricted stock units    
Shares    
Nonvested balance at beginning of period (shares) 1.8  
Granted (shares) 0.4  
Vested (shares) (0.8)  
Forfeited (shares) 0.0  
Nonvested balance at end of period (shares) 1.4  
Weighted Average Grant Date Fair Value    
Balance at beginning of period (USD per share) $ 96.63  
Granted (USD per share) 291.68  
Vested (USD per share) 87.53  
Forfeited (USD per share) 107.68  
Balance at end of period (USD per share) $ 161.58  
Aggregate intrinsic value $ 572,200,000 $ 392,000,000.0
Total vest date fair value 224,000,000.0  
Performance Shares    
Weighted Average Grant Date Fair Value    
Total vest date fair value $ 0