Guarantees and Indemnifications (Tables)

12 Months Ended

Dec. 31, 2015

Notes To Consolidated Financial Statements [Abstract]

Schedule Of Guarantee Obligations Text Block

			Maximum Exposure
Company		Description	(in millions)		Expiration Dates
On behalf of subsidiaries:
	Various	Surety Bonds (1)	$	32.7	2016 - 2018
	Eversource Service and Rocky River Realty Company	Lease Payments for Vehicles and Real Estate	$	11.4	2019 and 2024
On behalf of external parties:
	Algonquin Gas Transmission, LLC	Access Northeast project
	(owner of Access Northeast assets)	capital contributions guarantee	$	204.8	2021