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INCOME TAX EXPENSE (RECOVERY) - Impact of U.S Tax reform (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 01, 2018
Dec. 31, 2017
Dec. 31, 2016
Income tax expense (recovery)      
Income tax expense (recovery)   $ (23.2) $ 49.6
Net income tax benefit due to U.S tax reform legislation   93.4  
Net income tax benefit in respect of of collectivibility of AMT credit included in long-term receiveables   $ 124.4  
Applicable tax rate   26.50% 26.50%
United States      
Income tax expense (recovery)      
Applicable tax rate   35.00%  
Forecast | United States      
Income tax expense (recovery)      
Applicable tax rate 21.00%