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Provision for Uncollectible Accounts (Tables)
3 Months Ended
Mar. 31, 2012
Notes To Consolidated Financial Statements [Abstract]  
Schedule Of Accounts Notes Loans And Financing Receivable Text Block
(Millions of Dollars)As of March 31, 2012 As of December 31, 2011
NU$34.8 $34.9
CL&P 14.2  14.8
PSNH 7.9  7.2
WMECO 5.1  4.6