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FAIR VALUE MEASUREMENT - Derivative contracts (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Financial Instruments |  |  |
Unrealized fair value of derivative assets, current | $ 3.8 | $ 17.0 |
Unrealized fair value of derivative assets, non-current | 0.8 | 3.9 |
Unrealized fair value of derivative assets | 4.6 | 20.9 |
Unrealized fair value of derivative liabilities, current | (22.2) | (1.1) |
Unrealized fair value of derivative liabilities, non-current | (9.6) | (0.2) |
Unrealized fair value of derivative liabilities | (31.8) | (1.3) |
Net asset (liability) | (27.2) | 19.6 |
Accumulated other comprehensive income (loss) | (98.5) | 21.1 | $ 39.1
TRS |  |  |
Financial Instruments |  |  |
Net asset (liability) | 3.2 | 0.6 |
Accumulated other comprehensive income (loss) | 0.0 | 0.0 |
Derivative Contracts |  |  |
Financial Instruments |  |  |
Net asset (liability) | (27.2) | 19.6 |
Accumulated other comprehensive income (loss) | (23.3) | 14.2 |
Foreign currency forward and collar contracts |  |  |
Financial Instruments |  |  |
Net asset (liability) | (21.8) | 6.1 |
Accumulated other comprehensive income (loss) | (15.8) | 4.4 |
Reclassification of amounts to net earnings within the next 12 months as a result of settling the contracts | (13.3) |  |
Energy swap contracts |  |  |
Financial Instruments |  |  |
Net asset (liability) | (8.6) | 12.9 |
Accumulated other comprehensive income (loss) | (7.5) | $ 9.8 |
Reclassification of amounts to net earnings within the next 12 months as a result of settling the contracts | $ (2.9) |  |

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