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Debt - Narrative (Details)
$ / shares in Units, shares in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2019
USD ($)
d
$ / shares
shares
May 31, 2018
USD ($)
d
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
Sep. 30, 2019
USD ($)
$ / shares
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Feb. 28, 2014
USD ($)
Debt Instrument [Line Items]              
Repurchases of common stock     $ 175,500,000 $ 291,788,000 $ 625,925,000    
Payments for note hedge transactions       312,225,000 261,740,000    
Proceeds from sale of warrants       185,150,000 $ 119,945,000    
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 $ 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 years            
Threshold consecutive trading days not exceeding price 5 years            
Principal amount per conversion $ 1,000            
Threshold less than percentage of stock price trigger 98.00%            
Conversion rate 0.0086073            
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     $ 1,172,800,000 $ 1,172,800,000      
Closing price of common stock (in dollars per share) | $ / shares     $ 91.38 $ 91.38      
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            
Effective interest rate     3.10% 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   $ 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          
Threshold consecutive trading days not exceeding price   5 days          
Principal amount per conversion   $ 1,000          
Threshold less than percentage of stock price trigger   98.00%          
Conversion rate   0.010515          
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     $ 1,319,600,000 $ 1,319,600,000      
Closing price of common stock (in dollars per share) | $ / shares     $ 91.38 $ 91.38      
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          
Effective interest rate     4.26% 4.26%      
2019 Notes | Convertible Debt              
Debt Instrument [Line Items]              
Debt issued             $ 690,000,000.0
Effective interest rate     3.20% 3.20%