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STOCK-BASED COMPENSATION - DSU and RSU Activity (Details)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
DSUs    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of units outstanding beginning of period (shares) | shares 764 725
Settled for cash (shares) | shares (404) (143)
Forfeited (shares) | shares 0 0
Granted (shares) | shares 116 182
Credits for dividends (shares) | shares 0 0
Number of units outstanding end of period (shares) | shares 476 764
Fair value, beginning of period | $ $ 11.2 $ 11.6
Settled for cash | $ (6.5) (1.9)
Forfeited | $ 0.0 0.0
Granted | $ 1.9 2.3
Credits for dividends | $ $ 0.0 $ 0.0
Increase (decrease) in number of shares outstanding | shares 0 0
Change in value | $ $ 2.2 $ (0.8)
Fair value, end of period | $ $ 8.8 $ 11.2
RSUs    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of units outstanding beginning of period (shares) | shares 3,751 4,537
Settled for cash (shares) | shares (2,131) (3,089)
Forfeited (shares) | shares (1,157) (731)
Granted (shares) | shares 2,600 2,974
Credits for dividends (shares) | shares 47 60
Number of units outstanding end of period (shares) | shares 3,110 3,751
Fair value, beginning of period | $ $ 36.0 $ 37.7
Settled for cash | $ (30.7) (34.6)
Forfeited | $ (15.8) (7.9)
Granted | $ 35.3 35.3
Credits for dividends | $ $ 0.8 $ 0.8
Increase (decrease) in number of shares outstanding | shares 0 0
Change in value | $ $ 15.9 $ 4.7
Fair value, end of period | $ $ 41.5 $ 36.0