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ACQUISITIONS AND DIVESTITURES - Water Infrastructure Assets (Details) - Water Infrastructure Assets - USD ($) $ in Millions		6 Months Ended	12 Months Ended
	Dec. 20, 2018	Jun. 30, 2019	Dec. 31, 2018	Oct. 01, 2018
ACQUISITIONS AND DIVESTITURES
Sale price of asset in cash	$ 211.0
Incentives payable per year if certain thresholds are met				$ 25.0
(Gain) loss on sale of Water Assets
ACQUISITIONS AND DIVESTITURES
Gain (loss) from sale of other operating property and equipment		$ 3.8	$ 119.0

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- Definition

Total price of the sale of assets, including proceeds contingent on annual incentive thresholds per agreement.

+ References

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- Definition

Amount of agreed contingent cash price of sale of assets payable per year over a certain period per agreement.

+ References

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- Definition

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

+ References

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

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