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COMMITMENTS AND CONTINGENCIES Range of Environmental Liability and Number of Active Sites (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 USD ($) site | Dec. 31, 2016 USD ($)
Site Contingency [Line Items] |  |
Reduction to Environmental QSF Asset due to Settlement Agreement | $ 5.2 |
Reduction to Environmental QSF Deferred Gain due to Settlement Agreement | 5.2 |
Environmental-related assets | $ 24.3 | $ 33.4
Environmental Related Matters [Member] |  |
Site Contingency [Line Items] |  |
Number Of Active Environmental Investigation And Remediation Sites | site | 35 |
Maximum [Member] | Environmental Related Matters [Member] |  |
Site Contingency [Line Items] |  |
Loss Contingency, Range of Possible Loss, Maximum | $ 121.0 |

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