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ACQUISITION OF AQUARION - Narrative (Details) - USD ($)
$ in Millions
Dec. 04, 2017
Mar. 31, 2018
Aquarion Water Company    
Business Acquisition [Line Items]    
Consideration transferred $ 1,675.0  
Payments to acquire businesses 880.0  
Consideration transferred, liabilities incurred 795.0  
Equity interest 745.0  
Aquarion shareholder loan paid at closing $ 135.0  
Line of Credit | Aquarion    
Business Acquisition [Line Items]    
Long-term debt, fair value   $ 7.9