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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
Sep. 30, 2019
Sep. 30, 2018
Share-based Payment Arrangement [Abstract]    
Weighted-average fair value of options granted (in dollars per share) $ 6.41 $ 8.73
Weighted-average assumptions used:    
Expected volatility 22.11% 26.07%
Risk–free interest rate 1.68% 2.80%
Expected dividend yield 1.68% 1.45%
Expected life (in years) 4 years 1 month 9 days 4 years 3 months 25 days
Forfeiture rate (based on historical rates) 7.00% 6.00%
Average exercised share price (in dollars per share) $ 38.76 $ 39.27