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DISTRIBUTIONS - Additional Information (Details) - Preferred Unitholders Capital [Member] | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 $ / shares | Jun. 30, 2020 $ / shares | Jun. 30, 2021 $ / shares | Jun. 30, 2021 $ / shares | Jun. 30, 2020 $ / shares
Disclosure of classes of share capital [line items] |  |  |  |  |
Quarterly Fixed Distribution Rate |  |  | 4.50% | 4.50% |
Dividends recognised as distributions to owners per share | $ 0.27 | $ 0.24 | $ 0.52 |  | $ 0.48
Pro Forma [Member] |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Quarterly Fixed Distribution Rate |  |  | 3.974% | 3.974% |
Canada, Dollars |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Dividends recognised as distributions to owners per share |  |  |  | $ 0.2813 |
Canada, Dollars | Pro Forma [Member] |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Dividends recognised as distributions to owners per share |  |  |  | $ 0.2484 |

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- Definition The amount, per share, of dividends recognised as distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 107 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_107&doctype=Standard -URIDate 2020-01-01 + Details
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