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Long-Term Debt - Senior Unsecured Fixed Rate Notes (Details) - USD ($)
3 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2019
Dec. 20, 2016
May 31, 2016
Jan. 15, 2015
Debt Instrument [Line Items]            
Long-term debt $ 2,635,000,000   $ 2,637,500,000      
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      
Interest expense 12,500,000 $ 12,500,000        
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 800,000,000   $ 800,000,000      
Interest expense $ 11,300,000 $ 11,300,000