DIVESTITURES - Water Infrastructure Assets (Details) - Water Infrastructure Assets - USD ($) $ in Millions		3 Months Ended
Dec. 20, 2018	Mar. 31, 2019
Purchase and Sale Agreement
ACQUISITIONS AND DIVESTITURES
Sale price of asset in cash	$ 210.9
(Gain) loss on sale of Water Assets
ACQUISITIONS AND DIVESTITURES
Gain (loss) from sale of other operating property and equipment		$ 0.9

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

Name:	us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration