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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, 2018
Dec. 31, 2017
Income tax expense (recovery)      
Net income tax benefit due to U.S tax reform legislation   $ 8.7 $ 93.4
Net income tax benefit in respect of of collectability of AMT credit included in long-term receivables   $ 66.1 $ 124.4
Applicable tax rate   26.50% 26.50%
United States      
Income tax expense (recovery)      
Applicable tax rate 21.00%   35.00%