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Debt - Narrative (Details)
$ / shares in Units, shares in Millions
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2018
USD ($)
d
$ / shares
shares
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 28, 2019
$ / shares
Dec. 31, 2018
USD ($)
Feb. 28, 2014
USD ($)
Debt Instrument [Line Items]              
Repurchases of common stock   $ 81,400,000 $ 116,247,000 $ 185,512,000      
Payments for note hedge transactions     0 261,740,000      
Proceeds from sale of warrants     0 $ 119,945,000      
Credit Agreement              
Debt Instrument [Line Items]              
Maximum borrowing capacity $ 500,000,000.0            
Maximum borrowing capacity under specific conditions $ 1,000,000,000.0            
Debt term 5 years            
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%        
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   $ 1,234,000,000.0 $ 1,234,000,000.0        
Closing price of common stock (in dollars per share) | $ / shares         $ 80.14    
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%