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STOCK-BASED COMPENSATION - DSU and RSU Activity (Details) shares in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 USD ($) shares | Dec. 31, 2021 USD ($) shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Fair value, beginning of period | $ 57.0 |
Fair value, end of period | $ 50.0 | $ 57.0
DSUs |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of units outstanding beginning of period (shares) | shares | 678 | 561
Settled for cash (shares) | shares | 0 | 0
Granted (shares) | shares | 159 | 117
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 | 837 | 678
Fair value, beginning of period | $ 12.6 | $ 12.8
Settled for cash | 0.0 | 0.0
Granted | 2.9 | 2.2
Credits for dividends | 0.0 | 0.0
Change in value | (1.1) | (2.4)
Fair value, end of period | $ 14.4 | $ 12.6
RSUs |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of units outstanding beginning of period (shares) | shares | 2,518 | 2,623
Settled for cash (shares) | shares | (1,656) | (1,435)
Granted (shares) | shares | 1,406 | 1,300
Credits for dividends (shares) | shares | 69 | 30
Increase (decrease) in number of shares outstanding | shares | 0 | 0
Number of units outstanding end of period (shares) | shares | 2,337 | 2,518
Fair value, beginning of period | $ 31.0 | $ 38.6
Settled for cash | (29.2) | (36.2)
Granted | 24.2 | 26.4
Credits for dividends | 1.3 | 0.6
Change in value | (1.0) | 1.6
Fair value, end of period | $ 26.3 | $ 31.0

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