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STOCK-BASED COMPENSATION - DSU and RSU Activity (Details)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2022
USD ($)
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Fair value, beginning of period $ 50.0  
Fair value, end of period $ 50.0 $ 50.0
DSUs    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of units outstanding beginning of period (shares) | shares 837 678
Settled for cash (shares) | shares 0 0
Granted (shares) | shares 174 159
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 1,011 837
Fair value, beginning of period $ 14.4 $ 12.6
Settled for cash 0.0 0.0
Granted 2.9 2.9
Credits for dividends 0.0 0.0
Change in value 1.0 (1.1)
Fair value, end of period $ 18.3 $ 14.4
RSUs    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of units outstanding beginning of period (shares) | shares 2,337 2,518
Settled for cash (shares) | shares (1,383) (1,656)
Granted (shares) | shares 1,820 1,406
Credits for dividends (shares) | shares 81 69
Increase (decrease) in number of shares outstanding | shares 0 0
Number of units outstanding end of period (shares) | shares 2,855 2,337
Fair value, beginning of period $ 26.3 $ 31.0
Settled for cash (23.2) (29.2)
Granted 32.9 24.2
Credits for dividends 1.4 1.3
Change in value (3.4) (1.0)
Fair value, end of period $ 34.0 $ 26.3