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STOCK-BASED COMPENSATION - DSU and RSU Activity (Details) shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares
DSUs |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of units outstanding beginning of period (shares) | shares | 725.0 | 573.0
Settled for cash (shares) | shares | (143.0) | 0.0
Forfeited (shares) | shares | 0.0 | 0.0
Granted (shares) | shares | 182.0 | 152.0
Credits for dividends (shares) | shares | 0.0 | 0.0
Number of units outstanding end of period (shares) | shares | 764.0 | 725.0
Fair value, beginning of period | $ | $ 11.6 | $ 9.2
Settled for cash | $ | (1.9) | 0.0
Forfeited | $ | 0.0 | 0.0
Granted | $ | 2.3 | 2.5
Credits for dividends | $ | $ 0.0 | $ 0.0
Increase (decrease) in number of shares outstanding | shares | 0.0 | 0.0
Change in value | $ | $ (0.8) | $ (0.1)
Fair value, end of period | $ | $ 11.2 | $ 11.6
RSUs |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of units outstanding beginning of period (shares) | shares | 4,537.0 | 6,452.0
Settled for cash (shares) | shares | (3,089.0) | (3,610.0)
Forfeited (shares) | shares | (731.0) | (121.0)
Granted (shares) | shares | 2,974.0 | 1,760.0
Credits for dividends (shares) | shares | 60.0 | 56.0
Number of units outstanding end of period (shares) | shares | 3,751.0 | 4,537.0
Fair value, beginning of period | $ | $ 37.7 | $ 58.6
Settled for cash | $ | (34.6) | (62.5)
Forfeited | $ | (7.9) | (2.3)
Granted | $ | 35.3 | 32.7
Credits for dividends | $ | $ 0.8 | $ 0.9
Increase (decrease) in number of shares outstanding | shares | 0.0 | 0.0
Change in value | $ | $ 4.7 | $ 10.3
Fair value, end of period | $ | $ 36.0 | $ 37.7

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