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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Tax Reform |  |  |  |
Income tax expense |  | $ 246.7 | $ 138.8 |
Applicable tax rate |  | 26.50% | 26.50% |
U.S Tax Reform |  |  |  |
Tax Reform |  |  |  |
Income tax expense |  | $ 4.6 | $ 8.7 | $ 93.4
Applicable tax rate | 21.00% |  |  | 35.00%
Alternative Minimum Tax |  |  |  |
Tax Reform |  |  |  |
Income tax expense |  |  |  | $ 124.4

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