Quarterly report pursuant to Section 13 or 15(d)

Debt - Schedule of Debt (Details)

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Debt - Schedule of Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Nov. 30, 2014
Oct. 31, 2014
Debt Instrument          
Total debt, gross $ 3,425,000 $ 3,450,000      
Unamortized discount (8,319) (8,738)      
Unamortized debt issuance costs (16,804) (17,880)      
Total, net of discount 3,399,877 3,423,382      
Current portion of long-term debt 0 249,999      
Long-term debt $ 3,399,877 3,173,383      
Senior notes          
Debt Instrument          
Unamortized discount     $ (6,700) $ (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 $ 0 $ 250,000      
Effective interest rate 0.00% 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%       4.65%
Total debt, gross $ 1,250,000 $ 1,250,000      
Effective interest rate 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%      
Fixed-rate 4.100% Senior Notes due on March 15, 2029 | Senior notes          
Debt Instrument          
Stated interest rate 4.10%        
Total debt, gross $ 800,000 $ 800,000      
Effective interest rate 4.159% 4.159%      
Fixed-rate 5.000% Senior Notes due on March 15, 2049 | Senior notes          
Debt Instrument          
Stated interest rate 5.00%        
Total debt, gross $ 400,000 $ 400,000      
Effective interest rate 5.047% 5.047%      
Revolving credit facility | Line of credit          
Debt Instrument          
Total debt, gross $ 225,000 $ 0      
Effective interest rate 2.84%