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Summary Of Significant Accounting Policies New Accounting Standards (Details) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
New Accounting Standards [Abstract]      
Excess Tax Benefit from Share-based Compensation, Financing Activities $ 1.4    
Payments Related to Tax Withholding for Share-based Compensation   $ 3.1 $ 3.2
Expected reclassification of combined pension income and postretirement cost due to new accounting standard (17.0) $ (18.0)  
Operating Leases, Future Minimum Payments Due $ 65.0