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FAIR VALUE MEASUREMENT - Derivative contracts (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Financial Instruments |  |
Unrealized fair value of derivative assets | $ 6.5 | $ 7.2
Unrealized fair value of derivative assets | 10.5 | 4.5
Unrealized fair value of derivative assets | 17.0 | 11.7
Unrealized fair value of derivative liabilities, current | (21.3) | (4.3)
Unrealized fair value of derivative liabilities, non-current | (3.4) | (0.8)
Unrealized fair value of derivative liabilities | (24.7) | (5.1)
Net asset (liability) | (7.7) | 6.6
Total return swap contract |  |
Financial Instruments |  |
Net asset (liability) | (11.0) | (1.3)
Unrealized gain (loss) recorded in AOCI | 0.0 | 0.0
Derivative Contracts |  |
Financial Instruments |  |
Net asset (liability) | (7.7) | 6.6
Unrealized gain (loss) recorded in AOCI | 2.2 | 5.8
Foreign currency forward and collar contracts |  |
Financial Instruments |  |
Net asset (liability) | (4.3) | 3.9
Unrealized gain (loss) recorded in AOCI | (2.5) | 2.6
Reclassification of amounts to net earnings within the next 12 months as a result of settling the contracts | (4.1) |
Energy Swap |  |
Financial Instruments |  |
Net asset (liability) | 7.6 | 4.0
Unrealized gain (loss) recorded in AOCI | 4.7 | $ 3.2
Reclassification of amounts to net earnings within the next 12 months as a result of settling the contracts | $ (0.5) |

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