Quarterly report pursuant to Section 13 or 15(d)

Debt - Schedule of Debt (Details)

v3.10.0.1
Debt - Schedule of Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Nov. 30, 2014
Oct. 31, 2014
Debt Instrument        
Total debt, gross $ 2,250,000 $ 2,250,000    
Unamortized discount (2,433) (2,523)    
Unamortized debt issuance costs (9,677) (10,075)    
Total debt, net of discount 2,237,890 2,237,402    
Long-term debt $ 2,237,890 2,237,402    
Senior notes        
Debt Instrument        
Unamortized discount     $ (4,000)  
Fixed-rate 3.375% Senior Notes due on November 1, 2019 | Senior notes        
Debt Instrument        
Stated interest rate 3.375%      
Total debt, gross $ 250,000 $ 250,000    
Effective interest rate 3.377% 3.377%    
Fixed-rate 4.125% Senior Notes due on November 1, 2021 | Senior notes        
Debt Instrument        
Stated interest rate 4.125%      
Total debt, gross $ 500,000 $ 500,000    
Effective interest rate 4.128% 4.128%    
Fixed-rate 4.650% Senior Notes due on November 1, 2024 | Senior notes        
Debt Instrument        
Stated interest rate 4.65% [1]     4.65%
Total debt, gross [1] $ 1,250,000 $ 1,250,000    
Effective interest rate [1] 4.682% 4.682%    
Fixed-rate 5.650% Senior Notes due on November 1, 2034 | Senior notes        
Debt Instrument        
Stated interest rate 5.65%      
Total debt, gross $ 250,000 $ 250,000    
Effective interest rate 5.67% 5.67%    
Portion of senior notes | Cash flow hedge contracts- foreign currency | Senior notes | Treasury lock | Derivatives designated as hedging instruments        
Debt Instrument        
Effective percentage including treasury rate lock hedge 4.626%      
[1] The effective interest rate disclosed above for this series of Senior Notes excludes the impact of the treasury rate lock hedge discussed below. The effective interest rate including the impact of the treasury rate lock hedge was 4.626%.