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Convertible Debt (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended 3 Months Ended
Apr. 30, 2021
Dec. 31, 2019
Mar. 31, 2021
Dec. 31, 2020
Convertible Debt [Abstract]        
Cost of call spread   $ 52.6    
Purchase of note hedges   108.7    
Proceeds from issuance of warrants   $ 56.1    
Subsequent Event [Member]        
Convertible Debt [Abstract]        
Cost of call spread $ 46.9      
Purchase of note hedges 136.7      
Proceeds from issuance of warrants 89.8      
0% Convertible Senior Notes [Member] | Subsequent Event [Member]        
Convertible Debt [Abstract]        
Face amount of offering 632.5      
Outstanding principal balance $ 632.5      
Maturity date Apr. 30, 2026      
Interest rate 0.00%      
Conversion price per share (in dollars per share) $ 57.84      
Effective conversion price per share with call spread (in dollars per share) $ 76.39      
Total shares of common stock subject to conversion (in shares) 10.9      
Percentage of principal amount used as purchase price upon occurrence of fundamental change 100.00%      
0.125% Convertible Senior Notes [Member]        
Convertible Debt [Abstract]        
Outstanding principal balance     $ 548.8  
Maturity date     Dec. 31, 2024  
Interest rate     0.125% 0.125%
Conversion price per share (in dollars per share)     $ 83.28  
Effective conversion price per share with call spread (in dollars per share)     $ 123.38  
Total shares of common stock subject to conversion (in shares)     6.6  
Unamortized debt issuance costs     $ 8.1  
Percentage of principal amount used as purchase price upon occurrence of fundamental change     100.00%  
1% Convertible Senior Notes [Member]        
Convertible Debt [Abstract]        
Outstanding principal balance     $ 309.9  
Maturity date     Nov. 30, 2021  
Interest rate     1.00% 1.00%
Conversion price per share (in dollars per share)     $ 66.81  
Total shares of common stock subject to conversion (in shares)     4.6  
Unamortized debt issuance costs     $ 0.8  
Percentage of principal amount used as purchase price upon occurrence of fundamental change     100.00%  
1% Convertible Senior Notes [Member] | Subsequent Event [Member]        
Convertible Debt [Abstract]        
Principal amount repurchased $ 247.9      
Repurchase of convertible notes 257.0      
Outstanding principal balance $ 62.0      
Total shares of common stock subject to conversion (in shares) 0.9