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

Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14557-108349

Name:	us-gaap_LossContingencyEstimateOfPossibleLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant