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Guarantees and Indemnifications (Tables)
9 Months Ended
Sep. 30, 2014
Notes To Consolidated Financial Statements [Abstract]  
Schedule Of Guarantee Obligations Text Block
    Maximum Exposure    
Subsidiary Description (in millions)  Expiration Dates
Various Surety Bonds  $64.3  2014 - 2016 (1)
          
Various New England Hydro Companies' Long-Term Debt $2.0  Unspecified
         
NUSCO and RRR Lease Payments for Vehicles and Real Estate  $15.3  2019 and 2024