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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