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STOCK-BASED COMPENSATION - DSU and RSU Activity (Details)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2023
USD ($)
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 $ 54.0 $ 50.0
Deferred Share Units [Member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of units outstanding beginning of period (shares) | shares 1,011 837
Settled for cash (shares) | shares (384) 0
Granted (shares) | shares 145 174
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 772 1,011
Fair value, beginning of period $ 18.3 $ 14.4
Aggregate share-based liability, fair value, other equity instruments, exercised or vested (6.7) 0.0
Aggregate share-based liability, fair value, other equity instruments, granted 2.5 2.9
Aggregate share-based liability fair value, other equity instruments, credit for dividends 0.0 0.0
Increase (decrease) in aggregate share-based liability, fair value, other equity instruments (2.1) 1.0
Fair value, end of period $ 12.0 $ 18.3
Restricted share units [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of units outstanding beginning of period (shares) | shares 2,855 2,337
Settled for cash (shares) | shares (1,665) (1,383)
Granted (shares) | shares 2,395 1,820
Credits for dividends (shares) | shares 101 81
Increase (decrease) in number of shares outstanding | shares 0 0
Number of units outstanding end of period (shares) | shares 3,686 2,855
Fair value, beginning of period $ 34.0 $ 26.3
Aggregate share-based liability, fair value, other equity instruments, exercised or vested (31.3) (23.2)
Aggregate share-based liability, fair value, other equity instruments, granted 37.6 32.9
Aggregate share-based liability fair value, other equity instruments, credit for dividends 1.7 1.4
Increase (decrease) in aggregate share-based liability, fair value, other equity instruments (2.7) (3.4)
Fair value, end of period $ 39.3 $ 34.0