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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%

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