EARNINGS PER SHARE (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

The following table sets forth the components of basic and diluted EPS:

Eversource (Millions of Dollars, except share information)	For the Years Ended December 31,
	2017		2016		2015
Net Income Attributable to Common Shareholders	$	988.0	$	942.3	$	878.5
Weighted Average Common Shares Outstanding:
Basic	317,411,097		317,650,180		317,336,881
Dilutive Effect	620,483		804,059		1,095,806
Diluted	318,031,580		318,454,239		318,432,687
Basic EPS	$	3.11	$	2.97	$	2.77
Diluted EPS	$	3.11	$	2.96	$	2.76