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Long-Term Debt - Senior Unsecured Fixed Rate Notes (Details) - USD ($)
3 Months Ended 9 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Dec. 20, 2016
Jun. 30, 2016
May 31, 2016
Jan. 15, 2015
Debt Instrument [Line Items]                
Long-term debt $ 2,649,060,000   $ 2,649,060,000     $ 2,180,000,000    
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     600,000,000    
Interest expense 12,500,000 $ 0 30,700,000 $ 0        
Senior Notes | Senior Notes 2023                
Debt Instrument [Line Items]                
Debt instrument face amount               $ 800,000,000.0
Debt instrument stated interest rate               5.625%
Long-term debt 800,000,000   800,000,000     $ 800,000,000    
Interest expense $ 11,200,000 $ 11,200,000 $ 33,700,000 $ 33,700,000