ACCOUNTING POLICIES - Stock Based Compensation (Details)	1 Months Ended
	Dec. 31, 2019
Stock Options
Award requisite service period	10 years
Phantom Share Units (PSUs)
Stock Options
Award vesting period	3 years
Phantom Share Units (PSUs) | 2020
Stock Options
Award vesting period	3 years
Phantom Share Units (PSUs) | 2019
Stock Options
Award vesting period	5 years
Stock options
Stock Options
Award vesting period	3 years
Stock options | 2020
Stock Options
Award vesting period	3 years
Stock options | 2019
Stock Options
Award vesting period	5 years
Restricted stock units
Stock Options
Award vesting period	3 years
Restricted stock units | 2020
Stock Options
Award vesting period	3 years
Restricted stock units | 2019
Stock Options
Award vesting period	5 years
Performance restricted stock units
Stock Options
Award vesting period	3 years