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CHANGES IN SIGNIFICANT ACCOUNTING POLICIES AND RECENT ACCOUNTING PRONOUNCEMENTS (Details) - USD ($) $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 01, 2018 | Dec. 31, 2018 | Jan. 01, 2019 | Dec. 31, 2016
Balance at the beginning of the period | $ 4,619.2 | $ 4,619.2 |  |
Adjustment on initial application of IFRS 9 |  | (56.3) |  |
Balance at the end of the period |  | 4,527.3 |  |
Adoption of IFRS 16 | Forecast | Minimum |  |  |  |
Lease liabilities |  |  | $ 35.0 |
Adoption of IFRS 16 | Forecast | Maximum |  |  |  |
Lease liabilities |  |  | $ 55.0 |
Accumulated other comprehensive income (loss) |  |  |  |
Balance at the beginning of the period | 21.1 | 21.1 |  |
Adjusted balance at the beginning of the period | (35.2) |  |  | $ 39.1
Balance at the end of the period |  | (98.5) |  |
Accumulated other comprehensive income (loss) | Initial application of IFRS 9 |  |  |  |
Adjustment on initial application of IFRS 9 | (56.3) | (56.3) |  |
Accumulated deficit |  |  |  |
Balance at the beginning of the period | (10,580.7) | (10,580.7) |  |
Adjusted balance at the beginning of the period | (10,524.4) |  |  | $ (11,026.1)
Balance at the end of the period |  | $ (10,548.0) |  |
Accumulated deficit | Initial application of IFRS 9 |  |  |  |
Adjustment on initial application of IFRS 9 | $ 56.3 |  |  |

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