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STOCK-BASED COMPENSATION - DSU and RSU Activity (Details) shares in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares
DSUs |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of units outstanding beginning of period (shares) | shares | 764 | 725
Settled for cash (shares) | shares | (404) | (143)
Forfeited (shares) | shares | 0 | 0
Granted (shares) | shares | 116 | 182
Credits for dividends (shares) | shares | 0 | 0
Number of units outstanding end of period (shares) | shares | 476 | 764
Fair value, beginning of period | $ | $ 11.2 | $ 11.6
Settled for cash | $ | (6.5) | (1.9)
Forfeited | $ | 0.0 | 0.0
Granted | $ | 1.9 | 2.3
Credits for dividends | $ | $ 0.0 | $ 0.0
Increase (decrease) in number of shares outstanding | shares | 0 | 0
Change in value | $ | $ 2.2 | $ (0.8)
Fair value, end of period | $ | $ 8.8 | $ 11.2
RSUs |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of units outstanding beginning of period (shares) | shares | 3,751 | 4,537
Settled for cash (shares) | shares | (2,131) | (3,089)
Forfeited (shares) | shares | (1,157) | (731)
Granted (shares) | shares | 2,600 | 2,974
Credits for dividends (shares) | shares | 47 | 60
Number of units outstanding end of period (shares) | shares | 3,110 | 3,751
Fair value, beginning of period | $ | $ 36.0 | $ 37.7
Settled for cash | $ | (30.7) | (34.6)
Forfeited | $ | (15.8) | (7.9)
Granted | $ | 35.3 | 35.3
Credits for dividends | $ | $ 0.8 | $ 0.8
Increase (decrease) in number of shares outstanding | shares | 0 | 0
Change in value | $ | $ 15.9 | $ 4.7
Fair value, end of period | $ | $ 41.5 | $ 36.0

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