XML 204 R152.htm IDEA: XBRL DOCUMENT v3.8.0.1
ACQUISITION OF AQUARION AND GOODWILL - Schedule of Pro Forma Information (Details) - Aquarion Water Company - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]    
Operating Revenues $ 7,947.7 $ 7,849.0
Net Income Attributable to Common Shareholders $ 1,019.1 $ 969.3
Basic EPS (in dollars per share) $ 3.21 $ 3.05
Diluted EPS (in dollars per share) $ 3.20 $ 3.04