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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, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Share-based Payment Arrangement [Abstract]        
Weighted-average fair value of options granted (in dollars per share) $ 7.28 $ 7.64 $ 6.95 $ 8.28
Weighted-average assumptions used:        
Expected volatility 21.80% 25.60% 21.92% 25.92%
Risk–free interest rate 1.38% 2.51% 1.49% 2.73%
Expected dividend yield 1.55% 1.63% 1.60% 1.53%
Expected life (in years) 4 years 1 month 20 days 4 years 1 month 9 days 4 years 1 month 17 days 4 years 3 months 3 days
Forfeiture rate (based on historical rates) 7.00% 6.00% 7.00% 6.00%
Average exercised share price (in dollars per share) $ 44.99 $ 37.24 $ 42.57 $ 38.16