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Long-Term Debt (Senior Unsecured Fixed Rate Notes) (Details) - Senior Notes - USD ($)
3 Months Ended 6 Months Ended
Dec. 31, 2015
Dec. 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 $ 22,500,000