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COMMITMENTS AND CONTINGENCIES - Environmental Contingencies (Details) - Environmental remediation unrelated to claims and legal proceedings - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Commitments and Contingencies Disclosure    
Environmental remediation liabilities $ 41.9 $ 44.3
Receivables related to environmental remediation expenditures covered by insurance or third party claims $ 5.7 $ 7.2