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STOCK-BASED COMPENSATION - DSU and RSU Activity (Details)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
DSUs    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of units outstanding beginning of period (shares) | shares 476 764
Settled for cash (shares) | shares 0 (404)
Forfeited (shares) | shares 0 0
Granted (shares) | shares 85 116
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 561 476
Fair value, beginning of period | $ $ 8.8 $ 11.2
Settled for cash | $ 0.0 (6.5)
Forfeited | $ 0.0 0.0
Granted | $ 2.0 1.9
Credits for dividends | $ 0.0 0.0
Change in value | $ 2.0 2.2
Fair value, end of period | $ $ 12.8 $ 8.8
RSUs    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of units outstanding beginning of period (shares) | shares 3,110 3,751
Settled for cash (shares) | shares (2,136) (2,131)
Forfeited (shares) | shares (313) (1,157)
Granted (shares) | shares 1,923 2,600
Credits for dividends (shares) | shares 39 47
Increase (decrease) in number of shares outstanding | shares 0 0
Number of units outstanding end of period (shares) | shares 2,623 3,110
Fair value, beginning of period | $ $ 41.5 $ 36.0
Settled for cash | $ (47.3) (30.7)
Forfeited | $ (5.7) (15.8)
Granted | $ 35.2 35.3
Credits for dividends | $ 0.9 0.8
Change in value | $ 14.0 15.9
Fair value, end of period | $ $ 38.6 $ 41.5