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SIGNIFICANT ACCOUNTING POLICIES - Share-Based Compensation (Details)
12 Months Ended
Dec. 31, 2019
Share-Based Compensation  
Authorized percentage to issue outstanding common shares from treasury (as a percent) 3.80%
Volume weighted average price prior to the grant date, period 20 days
RSU  
Share-Based Compensation  
Award vesting percentage (as a percent) 33.33%
Award vesting period 3 years
PSU  
Share-Based Compensation  
Award vesting period 3 years
Multiplier, low end of range 0
Multiplier, high end of range 2