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Debt - Components of Interest Expense and Effective Interest Rates of Senior Convertible Notes (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
May 31, 2020
Nov. 30, 2018
Jun. 30, 2017
Cash interest expense:                
Contractual coupon interest $ 2,400,000 $ 2,400,000 $ 7,000,000.0 $ 7,100,000        
Non-cash interest expense:                
Accretion of debt discount 20,800,000 20,000,000.0 62,100,000 48,300,000        
Amortization of debt issuance costs 1,100,000 1,100,000 3,300,000 3,100,000        
Total interest expense recognized on senior notes 24,300,000 $ 23,500,000 72,400,000 $ 58,500,000        
Senior Notes                
Non-cash interest expense:                
Principal amount $ 2,024,900,000   $ 2,024,900,000   $ 2,057,500,000      
Senior Convertible Notes due 2022                
Non-cash interest expense:                
Effective interest rate (as a percent)   5.10%   5.10%        
Senior Convertible Notes due 2022 | Senior Notes                
Non-cash interest expense:                
Principal amount           $ 260,000,000   $ 400,000,000
Interest rate on convertible notes (as a percent)               0.75%
Senior Convertible Notes due 2023                
Non-cash interest expense:                
Effective interest rate (as a percent) 5.60% 5.60% 5.60% 5.60%        
Senior Convertible Notes due 2023 | Senior Notes                
Non-cash interest expense:                
Principal amount $ 817,400,000   $ 817,400,000   850,000,000.0   $ 850,000,000  
Interest rate on convertible notes (as a percent)             0.75%  
Senior Convertible Notes due 2025                
Non-cash interest expense:                
Effective interest rate (as a percent) 5.50% 5.50% 5.50% 5.50%        
Senior Convertible Notes due 2025 | Senior Notes                
Non-cash interest expense:                
Principal amount $ 1,207,500,000   $ 1,207,500,000   $ 1,207,500,000 $ 1,210,000,000    
Interest rate on convertible notes (as a percent)           0.25%