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STOCK-BASED COMPENSATION - DSU and RSU Activity (Details) shares in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 USD ($) shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Fair value, beginning of period | $ 67.0 |
Fair value, end of period | $ 57.0 | $ 67.0
DSUs |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of units outstanding beginning of period (shares) | shares | 561 | 476
Settled for cash (shares) | shares | 0 | 0
Forfeited (shares) | shares |  | 0
Granted (shares) | shares | 117 | 85
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 | 678 | 561
Fair value, beginning of period | $ 12.8 | $ 8.8
Settled for cash | 0.0 | 0.0
Forfeited |  | 0.0
Granted | 2.2 | 2.0
Credits for dividends | 0.0 | 0.0
Change in value | (2.4) | 2.0
Fair value, end of period | $ 12.6 | $ 12.8
RSUs |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of units outstanding beginning of period (shares) | shares | 2,623 | 3,110
Settled for cash (shares) | shares | (1,435) | (2,136)
Forfeited (shares) | shares |  | (313)
Granted (shares) | shares | 1,300 | 1,923
Credits for dividends (shares) | shares | 30 | 39
Increase (decrease) in number of shares outstanding | shares | 0 | 0
Number of units outstanding end of period (shares) | shares | 2,518 | 2,623
Fair value, beginning of period | $ 38.6 | $ 41.5
Settled for cash | (36.2) | (47.3)
Forfeited |  | (5.7)
Granted | 26.4 | 35.2
Credits for dividends | 0.6 | 0.9
Change in value | 1.6 | 14.0
Fair value, end of period | $ 31.0 | $ 38.6

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