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Stockholders' Equity - Schedule of Restricted, Revest, and Performance Shares (Details) - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
RSUs    
Number of Shares    
Beginning balance (in shares) 4,520,000  
Granted (in shares) 1,890,000  
Vested (in shares) (1,463,000)  
Cancelled/forfeited (in shares) (470,000)  
Ending balance (in shares) 4,477,000 4,520,000
Weighted-Average  Grant Date Fair Value Per Share    
Beginning balance (in USD per share) $ 30.01  
Granted (in USD per share) 63.95  
Vested (in USD per share) 33.52  
Forfeited (in USD per share) 42.78  
Ending balance (in USD per share) $ 41.85 $ 30.01
Revest Shares    
Number of Shares    
Beginning balance (in shares) 784,000  
Vested (in shares) (336,000)  
Cancelled/forfeited (in shares) 0  
Ending balance (in shares) 448,000 784,000
Weighted-Average  Grant Date Fair Value Per Share    
Beginning balance (in USD per share) $ 97.84  
Vested (in USD per share) 97.84  
Forfeited (in USD per share)  
Ending balance (in USD per share) $ 97.84 $ 97.84
PSUs    
Number of Shares    
Beginning balance (in shares) 88,000  
Granted (in shares) 71,000 75,828
Vested (in shares) (57,000)  
Cancelled/forfeited (in shares) (12,000) (12,090)
Ending balance (in shares) 90,000 88,000
Weighted-Average  Grant Date Fair Value Per Share    
Beginning balance (in USD per share) $ 65.11  
Granted (in USD per share) 102.06  
Vested (in USD per share) 44.25  
Forfeited (in USD per share) 44.25  
Ending balance (in USD per share) $ 110.29 $ 65.11