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STOCK-BASED COMPENSATION - DSU and RSU Activity (Details)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
DSUs    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of units outstanding beginning of period (shares) | shares 573 465
Settled for cash (shares) | shares 0 (26)
Forfeited (shares) | shares 0 0
Granted (shares) | shares 152 134
Credits for dividends (shares) | shares 0 0
Number of units outstanding end of period (shares) | shares 725 573
Fair value, beginning of period $ 9.2 $ 3.5
Settled for cash 0.0 (0.4)
Forfeited 0.0 0.0
Granted 2.5 2.2
Credits for dividends 0.0 0.0
Change in value (0.1) 3.8
Fair value, end of period $ 11.6 $ 9.2
RSUs    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of units outstanding beginning of period (shares) | shares 6,452 6,627
Settled for cash (shares) | shares (3,610) (1,102)
Forfeited (shares) | shares (121) (2,952)
Granted (shares) | shares 1,760 3,836
Credits for dividends (shares) | shares 56 43
Number of units outstanding end of period (shares) | shares 4,537 6,452
Fair value, beginning of period $ 58.6 $ 24.6
Settled for cash (62.5) (22.7)
Forfeited (2.3) (46.3)
Granted 32.7 55.0
Credits for dividends 0.9 0.7
Change in value 10.3 47.3
Fair value, end of period $ 37.7 $ 58.6