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Convertible Senior Notes (Narrative) (Details) - USD ($)
9 Months Ended
Feb. 16, 2021
Sep. 30, 2021
Feb. 28, 2021
Feb. 09, 2021
Debt Instrument [Line Items]        
Fair value of convertible debt   $ 886,500,000    
Convertible Senior Notes [Member]        
Debt Instrument [Line Items]        
Principal amount of notes     $ 900,000,000 $ 900,000,000
Debt instrument, stated interest rate 1.50%   1.50%  
Maturity date   Feb. 15, 2028    
Issuance date   Feb. 16, 2021    
Shares issued conversion rate per $1,000 principal amount 22.9885      
Principal amount for conversion rate $ 1,000      
Conversion price per share $ 43.50      
Debt redemption, percentage of conversion price 150.00%      
Debt redemption, trading days 20 days      
Debt redemption, consecutive trading days 30 days      
Redemption price, percentage 100.00%      
Debt issuance costs   $ 4,500,000    
Debt instrument, effective interest rate   1.60%    
Each Day During the First 180 Days [Member] | Convertible Senior Notes [Member]        
Debt Instrument [Line Items]        
Additional interest in the event of default 0.25%      
181st Day to 360th Day [Member] | Convertible Senior Notes [Member]        
Debt Instrument [Line Items]        
Additional interest in the event of default 0.50%