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Debt - Narrative (Details)
$ / shares in Units, shares in Millions
1 Months Ended 3 Months Ended
Aug. 31, 2019
USD ($)
d
$ / shares
shares
May 31, 2018
USD ($)
d
$ / shares
shares
Mar. 31, 2020
USD ($)
$ / shares
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Feb. 28, 2014
USD ($)
Debt Instrument [Line Items]            
Repurchases of common stock     $ 80,550,000 $ 34,872,000    
Credit Agreement            
Debt Instrument [Line Items]            
Maximum borrowing capacity   $ 500,000,000.0        
Debt term   5 years        
Maximum borrowing capacity under specific conditions   $ 1,000,000,000.0        
Outstanding borrowings     $ 0      
Credit Agreement | Minimum            
Debt Instrument [Line Items]            
Commitment fee     0.075%      
Credit Agreement | Minimum | Base Rate            
Debt Instrument [Line Items]            
Basis spread on variable rate     0.00%      
Credit Agreement | Minimum | LIBOR            
Debt Instrument [Line Items]            
Basis spread on variable rate     0.875%      
Credit Agreement | Maximum            
Debt Instrument [Line Items]            
Commitment fee     0.15%      
Credit Agreement | Maximum | Base Rate            
Debt Instrument [Line Items]            
Basis spread on variable rate     0.25%      
Credit Agreement | Maximum | LIBOR            
Debt Instrument [Line Items]            
Basis spread on variable rate     1.25%      
2027 Notes | Convertible Debt            
Debt Instrument [Line Items]            
Debt issued $ 1,150,000,000.0   $ 1,150,000,000   $ 1,150,000,000  
Interest rate 0.375%          
Threshold trading days exceeding price | d 20          
Threshold consecutive trading days exceeding price | d 30          
Threshold greater than percentage of stock price trigger 130.00%          
Threshold trading days not exceeding price 5 days          
Conversion rate 0.0086073          
Principal amount per conversion $ 1,000          
Conversion price (in dollars per share) | $ / shares $ 116.18          
Potential conversion shares of convertible debt (in shares) | shares 9.9          
Fair value of convertible senior notes     $ 1,147,500,000   1,133,800,000  
Closing price of common stock (in dollars per share) | $ / shares     $ 91.49      
Repurchases of common stock $ 100,000,000.0          
Payments for purchase of convertible note hedge and warrant transactions 127,100,000          
Payments for note hedge transactions $ 312,200,000          
Warrants outstanding (in shares) | shares 9.9          
Warrant strike price (in dollars per share) | $ / shares $ 178.74          
Proceeds from sale of warrants $ 185,200,000          
Threshold less than percentage of stock price trigger 98.00%          
Effective interest rate     3.10%      
2025 Notes | Convertible Debt            
Debt Instrument [Line Items]            
Debt issued   $ 1,150,000,000.0 $ 1,150,000,000   1,150,000,000  
Interest rate   0.125%        
Threshold trading days exceeding price | d   20        
Threshold consecutive trading days exceeding price | d   30        
Threshold greater than percentage of stock price trigger   130.00%        
Threshold trading days not exceeding price   5 days        
Conversion rate   0.010515        
Principal amount per conversion   $ 1,000        
Conversion price (in dollars per share) | $ / shares   $ 95.10        
Potential conversion shares of convertible debt (in shares) | shares   12.1        
Fair value of convertible senior notes     $ 1,289,700,000   $ 1,270,700,000  
Closing price of common stock (in dollars per share) | $ / shares     $ 91.49      
Repurchases of common stock   $ 46,200,000        
Payments for purchase of convertible note hedge and warrant transactions   141,800,000        
Payments for note hedge transactions   $ 261,700,000        
Warrants outstanding (in shares) | shares   12.1        
Warrant strike price (in dollars per share) | $ / shares   $ 149.18        
Proceeds from sale of warrants   $ 119,900,000        
Threshold consecutive trading days not exceeding price   5 days        
Threshold less than percentage of stock price trigger   98.00%        
Effective interest rate     4.26%      
2019 Notes | Convertible Debt            
Debt Instrument [Line Items]            
Debt issued           $ 690,000,000.0
Effective interest rate     3.20%