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Long-Term Debt (Senior Unsecured Fixed Rate Notes) (Details) - Senior Notes - USD ($)
3 Months Ended 9 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Jan. 15, 2015
Debt Instrument [Line Items]          
Debt instrument face amount         $ 800,000,000.0
Debt instrument stated interest rate         5.625%
Interest expense $ 11,200,000 $ 9,400,000 $ 33,700,000 $ 9,400,000