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REVENUE Contract Assets and Liabilities (Details) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
Contract with Customer, Asset and Liability [Abstract] |  |  |
Short-term contract asset (see Note 2) | $ 24.8 | $ 43.2 | $ 0.0
Current Contract Assets, Percentage Change from Prior Period | (42.60%) |  |
Contract with Customer, Asset, Net, Noncurrent | $ 0.7 | 0.0 |
Noncurrent Contract Assets, Percentage Change from Prior Period | 100.00% |  |
Contract with Customer, Liability | $ (60.6) | (61.7) |
Current Contract Liabilities, Percentage Change from Prior Period | (1.80%) |  |
Net Contract Liabilities | $ (35.1) | $ (18.5) |
Net Contract Liability, Change from Prior Year | $ (16.6) |  |
Net Contract Liability, Percentage Change from Prior Period | 89.70% |  |

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