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ACQUISITIONS AND DIVESTITURES - Water Infrastructure Assets (Details) - Water Infrastructure Assets - Purchase and Sale Agreement - USD ($) $ in Millions			3 Months Ended	15 Months Ended
	Dec. 20, 2018	Oct. 01, 2018	Mar. 31, 2019	Mar. 31, 2019
ACQUISITIONS AND DIVESTITURES
Sale price of asset in cash	$ 211.9
Incentives payable per year if certain thresholds are met		$ 25.0
Deferred period of sale price based on certain thresholds		5 years
(Gain) loss on sale of Water Assets
ACQUISITIONS AND DIVESTITURES
Gain (loss) from sale of other operating property and equipment			$ 0.9	$ 118.1

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- Definition

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

+ References

No definition available.

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- Definition

The period over which the amount of agreed contingent cash price of sale of assets is paid, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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