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ACQUISITIONS AND DIVESTITURES - Water Infrastructure Assets (Details) - Water Infrastructure Assets - USD ($)
$ in Millions
12 Months Ended
Dec. 20, 2018
Dec. 31, 2018
Oct. 01, 2018
Purchase and Sale Agreement      
ACQUISITIONS AND DIVESTITURES      
Sale price of asset in cash $ 210.9    
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   $ 119.0