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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - MARKET RISK (Details) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Feb. 01, 2018 | Dec. 31, 2018 CAD ($) Number_of_equity | Dec. 31, 2017 CAD ($)
Fair Value Hedges |  |  |
Outstanding fair value hedges | $ |  | $ 0 | $ 0
Maximum |  |  |
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS |  |  |
Floating Rate Debt as Target Percentage of Total Debt Outstanding | 30.00% | 30.00% |
Interest rate contracts - short-term borrowings |  |  |
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS |  |  |
Average swap rate (as a percent) |  | 2.80% |
Interest rate contracts - long-term debt |  |  |
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS |  |  |
Average swap rate (as a percent) |  | 3.20% |
Equity contracts |  |  |
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS |  |  |
Number of forms of stock-based compensation with equity price risk | Number_of_equity |  | 1 |

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- Definition Net fair value of all derivative instruments designated as fair value hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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