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SHARE-BASED PAYMENTS - Restricted share units (Details) - RSUs $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 CAD ($) EquityInstruments | Dec. 31, 2016 CAD ($) EquityInstruments | Dec. 31, 2017 USD ($) EquityInstruments | Dec. 31, 2016 USD ($)
Share-based payment transaction |  |  |  |
Number of common shares issued when restricted share unit is exercised | EquityInstruments |  |  | 1 |
Additional consideration to acquire common share |  |  | $ 0.0 |
Vesting period | 3 years |  |  |
Summary of information about share units outstanding |  |  |  |
Balance at January 1 | EquityInstruments | 9,219,000 | 9,041,000 |  |
Granted | EquityInstruments | 5,128,000 | 5,502,000 |  |
Redeemed | EquityInstruments | (4,847,000) | (4,435,000) |  |
Forfeited | EquityInstruments | (1,223,000) | (889,000) |  |
Outstanding at end of period | EquityInstruments | 8,277,000 | 9,219,000 |  |
Balance at January 1 | $ 4.01 | $ 4.41 |  |
Granted | 5.07 | 4.14 |  |
Redeemed | 4.01 | 4.96 |  |
Forfeited | 4.24 | 4.11 |  |
Outstanding at end of period | $ 4.63 | $ 4.01 |  |
Liability recognized in respect of cash settled RSUs |  |  | $ 11.3 | $ 11.4

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