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Equity-Based Compensation (Schedule of Number of Awards and Weighted Average Grant Date Fair Value) (Details) - $ / shares
1 Months Ended 6 Months Ended
Feb. 29, 2020
Feb. 28, 2017
Jun. 30, 2019
Jun. 30, 2018
Performance stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of awards (in shares)     145,420 132,288
Weighted average grant date fair value (in USD per share)     $ 40.55 $ 33.35
Restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of awards (in shares)     117,821 69,055
Weighted average grant date fair value (in USD per share)     $ 39.37 $ 33.41
Deferred stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of awards (in shares)     7,509 10,255
Weighted average grant date fair value (in USD per share)     $ 37.95 $ 35.96
Common shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of awards (in shares)     7,509 2,113
Weighted average grant date fair value (in USD per share)     $ 37.95 $ 35.50
2015 Incentive Plan | Performance stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares to be issued on conversion as percentage of total award   95.50%    
2015 Incentive Plan | Scenario, Forecast | Performance stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares to be issued on conversion (in shares) 126,337