UNIT-BASED COMPENSATION (Details)	12 Months Ended
Dec. 31, 2019 year $ / shares	Dec. 31, 2018 year $ / shares	Dec. 31, 2017 year $ / shares
Share-Based Payment Arrangement [Abstract]
Exercise price (in usd per share)	$ 0.00	$ 22.50	$ 22.92
Average term to exercise \| year	0	7.5	7.5
Unit price volatility (percent)	0.00%	23.00%	25.00%
Liquidity discount (percent)	0.00%	25.00%	25.00%
Weighted average of expected annual dividend yield (percent)	0.00%	6.50%	6.50%
Risk-free rate (percent)	0.00%	2.82%	2.37%
Weighted average fair value per option (usd per option)	$ 0.00	$ 0.74	$ 1.60

Description Of Liquidity Discount, Share Options Granted

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- Definition

Share-Based Payment Arrangement [Abstract]

+ References

No definition available.

+ Details

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- Definition

The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2019-01-01
-Paragraph 47
-Subparagraph a
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_47_a_i&doctype=Standard
-URIDate 2019-03-27

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- Definition

The option life of share options granted.

+ References

+ Details

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- Definition

The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]]

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+ Details

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- Definition

The exercise price of share options granted.

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+ Details

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- Definition

The percentage of an expected dividend used to calculate the fair value of share options granted.

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- Definition

The weighted average share price used as input to the option pricing model to calculate the fair value of share options granted. [Refer: Option pricing model [member]; Weighted average [member]]

+ References

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