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ACQUISITION OF AQUARION AND GOODWILL (Tables)
 12 Months Ended
Dec. 31, 2019
Business Combinations [Abstract]  
Summary of Unaudited Pro Forma Financial Information The unaudited pro forma financial information has been presented for illustrative purposes only and is not necessarily indicative of the consolidated results of operations that would have been achieved or the future consolidated results of operations of Eversource.
(Pro forma amounts in millions, except share amounts)
For the Year Ended December 31, 2017
Operating Revenues
$
7,947.7

Net Income Attributable to Common Shareholders
1,019.1

Basic EPS
3.21

Diluted EPS
3.20
Summary of Goodwill by Reportable Segment
 The following table presents goodwill by reportable segment as of December 31, 2019 and 2018:
(Billions of Dollars)
Electric
Distribution
 
Electric
Transmission
 
Natural Gas
Distribution
 
Water Distribution
 
Total
Goodwill
$
2.5

 
$
0.6

 
$
0.4

 
$
0.9

 
$
4.4