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Long-Term Debt - Senior Unsecured Fixed Rate Notes (Details) - USD ($)
3 Months Ended 9 Months Ended
Mar. 05, 2020
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Feb. 18, 2020
Jun. 30, 2019
Dec. 20, 2016
May 31, 2016
Jan. 15, 2015
Debt Instrument [Line Items]                    
Long-term debt   $ 4,230,000,000   $ 4,230,000,000     $ 2,637,500,000      
Loss on extinguishment of debt   17,854,000 $ 0 17,854,000 $ 0          
Senior Notes | Senior Notes 2030                    
Debt Instrument [Line Items]                    
Debt instrument face amount           $ 900,000,000        
Debt instrument stated interest rate           4.125%        
Long-term debt   900,000,000   900,000,000     0      
Interest expense   4,400,000                
Senior Notes | Senior Notes 2028                    
Debt Instrument [Line Items]                    
Debt instrument face amount           $ 900,000,000        
Debt instrument stated interest rate           3.875%        
Long-term debt   900,000,000   900,000,000     0      
Interest expense   4,200,000                
Senior Notes | Senior Notes 2026                    
Debt Instrument [Line Items]                    
Debt instrument face amount               $ 250,000,000 $ 600,000,000  
Debt instrument stated interest rate                 5.875%  
Debt premium issue price percentage               102.75%    
Long-term debt   850,000,000   850,000,000     850,000,000      
Interest expense   12,500,000 12,500,000 37,500,000 37,500,000          
Senior Notes | Senior Notes 2023                    
Debt Instrument [Line Items]                    
Debt instrument face amount                   $ 800,000,000
Debt instrument stated interest rate                   5.625%
Long-term debt   0   0     $ 800,000,000      
Interest expense   $ 8,100,000 $ 11,200,000 $ 30,600,000 $ 33,700,000          
Debt redeemed, percentage of principal amount 101.406%                  
Loss on extinguishment of debt $ 17,900,000