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Provision for Uncollectible Accounts (Tables)
6 Months Ended
Jun. 30, 2011
Notes To Consolidated Financial Statements [Abstract]  
Schedule Of Accounts Notes Loans And Financing Receivable Text Block
(Millions of Dollars) As of June 30, 2011 As of December 31, 2010
NU $38.2 $39.8
CL&P  16.4  17.2
PSNH  7.5  6.8
WMECO  5.2  6.0