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COMMITMENTS AND CONTINGENCIES Range of Environmental Liability and Number of Active Sites (Details) $ in Millions | Mar. 31, 2018 USD ($) site | Dec. 31, 2017 USD ($)
--- | --- | ---
Site Contingency [Line Items] |  |
Environmental-related assets | $ 24.5 | $ 24.5
Environmental Related Matters [Member] |  |
Site Contingency [Line Items] |  |
Number Of Active Environmental Investigation And Remediation Sites | site | 37 |
Maximum [Member] | Environmental Related Matters [Member] |  |
Site Contingency [Line Items] |  |
Loss Contingency, Range of Possible Loss, Maximum | $ 119.8 |

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