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Long-Term Debt (Senior Unsecured Fixed Rate Notes) (Details) - Senior Notes - USD ($)
12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
May 31, 2016
Jan. 15, 2015
Senior Notes 2026        
Debt Instrument [Line Items]        
Debt instrument face amount     $ 600,000,000  
Debt instrument stated interest rate     5.875%  
Interest expense $ 2,900,000      
Senior Notes 2023        
Debt Instrument [Line Items]        
Debt instrument face amount       $ 800,000,000.0
Debt instrument stated interest rate       5.625%
Interest expense $ 45,000,000 $ 20,600,000