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Share-Based Compensation (Schedule of the Range of Assumptions Used to Estimate the Fair Value of Stock Options) (Details) - Stock Options
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Risk-free interest rate (minimum) 2.10% 1.40% 1.50%
Risk-free interest rate (maximum) 2.10% 2.00% 1.90%
Expected volatility 25.00% 24.00% 23.00%
Expected life in years 7 years 7 years 7 years
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Dividend yield 2.70% 2.20% 1.80%
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Dividend yield 2.80% 2.50% 2.00%