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COMMITMENTS AND CONTINGENCIES - Environmental Contingencies (Details) - Environmental remediation unrelated to claims and legal proceedings - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Commitments and Contingencies Disclosure    
Environmental remediation liabilities $ 40.4 $ 41.0
Receivables related to environmental remediation expenditures covered by insurance or third party claims $ 5.0 $ 5.3