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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