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Share Capital, Option Plans and Share-Based Payments (Schedule of Weighted-Average Fair Value Of Options And Weighted-Average Assumptions Used) (Details) - $ / shares
3 Months Ended 9 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Weighted-average fair value of options granted (in dollars per share) $ 10.81 $ 13.35 $ 11.06 $ 13.59
Expected volatility 31.53% 31.68% 32.23% 31.94%
Risk–free interest rate 1.08% 1.14% 1.34% 1.43%
Expected dividend yield 1.70% 1.27% 1.66% 1.20%
Expected life (in years) 4 years 3 months 29 days 4 years 3 months 29 days 4 years 3 months 29 days 4 years 3 months 29 days
Forfeiture rate (based on historical rates) 5.00% 5.00% 5.00% 5.00%
Average exercised share price (in dollars per share) $ 47.01 $ 54.17 $ 46.13 $ 54.57