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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% |  |

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