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STOCK-BASED COMPENSATION - DSU and RSU Activity (Details) shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares
DSUs |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of units outstanding beginning of period (shares) | shares | 573 | 465
Settled for cash (shares) | shares | 0 | (26)
Forfeited (shares) | shares | 0 | 0
Granted (shares) | shares | 152 | 134
Credits for dividends (shares) | shares | 0 | 0
Number of units outstanding end of period (shares) | shares | 725 | 573
Fair value, beginning of period | $ 9.2 | $ 3.5
Settled for cash | 0.0 | (0.4)
Forfeited | 0.0 | 0.0
Granted | 2.5 | 2.2
Credits for dividends | 0.0 | 0.0
Change in value | (0.1) | 3.8
Fair value, end of period | $ 11.6 | $ 9.2
RSUs |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of units outstanding beginning of period (shares) | shares | 6,452 | 6,627
Settled for cash (shares) | shares | (3,610) | (1,102)
Forfeited (shares) | shares | (121) | (2,952)
Granted (shares) | shares | 1,760 | 3,836
Credits for dividends (shares) | shares | 56 | 43
Number of units outstanding end of period (shares) | shares | 4,537 | 6,452
Fair value, beginning of period | $ 58.6 | $ 24.6
Settled for cash | (62.5) | (22.7)
Forfeited | (2.3) | (46.3)
Granted | 32.7 | 55.0
Credits for dividends | 0.9 | 0.7
Change in value | 10.3 | 47.3
Fair value, end of period | $ 37.7 | $ 58.6

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