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STOCK-BASED COMPENSATION - DSU and RSU Activity (Details) shares in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares
DSUs |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of units outstanding beginning of period (shares) | shares | 476 | 764
Settled for cash (shares) | shares | 0 | (404)
Forfeited (shares) | shares | 0 | 0
Granted (shares) | shares | 85 | 116
Credits for dividends (shares) | shares | 0 | 0
Increase (decrease) in number of shares outstanding | shares | 0 | 0
Number of units outstanding end of period (shares) | shares | 561 | 476
Fair value, beginning of period | $ | $ 8.8 | $ 11.2
Settled for cash | $ | 0.0 | (6.5)
Forfeited | $ | 0.0 | 0.0
Granted | $ | 2.0 | 1.9
Credits for dividends | $ | 0.0 | 0.0
Change in value | $ | 2.0 | 2.2
Fair value, end of period | $ | $ 12.8 | $ 8.8
RSUs |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of units outstanding beginning of period (shares) | shares | 3,110 | 3,751
Settled for cash (shares) | shares | (2,136) | (2,131)
Forfeited (shares) | shares | (313) | (1,157)
Granted (shares) | shares | 1,923 | 2,600
Credits for dividends (shares) | shares | 39 | 47
Increase (decrease) in number of shares outstanding | shares | 0 | 0
Number of units outstanding end of period (shares) | shares | 2,623 | 3,110
Fair value, beginning of period | $ | $ 41.5 | $ 36.0
Settled for cash | $ | (47.3) | (30.7)
Forfeited | $ | (5.7) | (15.8)
Granted | $ | 35.2 | 35.3
Credits for dividends | $ | 0.9 | 0.8
Change in value | $ | 14.0 | 15.9
Fair value, end of period | $ | $ 38.6 | $ 41.5

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