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Supplemental Cash Flow Information (Tables)
3 Months Ended
Mar. 31, 2012
Notes To Consolidated Financial Statements [Abstract]  
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
I. Supplemental Cash Flow Information
Non-cash investing activities include capital expenditures incurred but not yet paid as follows:
  
(Millions of Dollars)As of March 31, 2012 As of December 31, 2011 
NU $138.5 $168.5 
CL&P 36.6  32.7 
PSNH 32.5  51.1 
WMECO 56.6  61.3