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FAIR VALUE MEASUREMENT - Derivative contracts (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Financial Instruments |  |  |
Unrealized fair value of derivative assets, current | $ 17.0 | $ 16.1 |
Unrealized fair value of derivative assets, non-current | 3.9 | 6.0 |
Unrealized fair value of derivative assets | 20.9 | 22.1 |
Unrealized fair value of derivative liabilities, current | (1.1) | (7.1) |
Unrealized fair value of derivative liabilities, non-current | (0.2) |  |
Unrealized fair value of derivative liabilities | (1.3) | (7.1) |
Net asset (liability) | 19.6 | 15.0 |
Accumulated other comprehensive income (loss) | 21.1 | 39.1 | $ (31.3)
TRS |  |  |
Financial Instruments |  |  |
Net asset (liability) | 0.6 | (6.2) |
Accumulated other comprehensive income (loss) | 0.0 | 0.0 |
Derivative Contracts |  |  |
Financial Instruments |  |  |
Net asset (liability) | 19.6 | 15.0 |
Accumulated other comprehensive income (loss) | 14.2 | 15.5 |
Foreign currency forward and collar contracts |  |  |
Financial Instruments |  |  |
Net asset (liability) | 6.1 | 8.9 |
Accumulated other comprehensive income (loss) | 4.4 | 5.9 |
Reclassification of amounts to net earnings within the next 12 months as a result of settling the contracts | 4.2 |  |
Energy swap contracts |  |  |
Financial Instruments |  |  |
Net asset (liability) | 12.9 | 12.3 |
Accumulated other comprehensive income (loss) | 9.8 | $ 9.6 |
Reclassification of amounts to net earnings within the next 12 months as a result of settling the contracts | $ 7.3 |  |

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