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FAIR VALUE MEASUREMENT - Total return swap contracts (Details) - TRS - shares | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financial Instruments |  |
Units outstanding | 5,695,000 |
DSUs |  |
Financial Instruments |  |
Percent of stock units that were economically hedged | 74.00% | 90.00%
RSUs |  |
Financial Instruments |  |
Percent of stock units that were economically hedged | 102.00% | 84.00%

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- Definition Number of capital units or capital shares outstanding. This element is relevant to issuers of face-amount certificates and registered investment companies. + References No definition available. + Details
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition The percent of other equity instruments (other than share options) that were economically hedged in a share-based payment arrangement. + References No definition available. + Details
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- Details
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- Details
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