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ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables)
6 Months Ended
Jun. 30, 2014
Notes To Consolidated Financial Statements [Abstract]  
Schedule Of Accumulated Other Comprehensive Income Loss Table Text Block
  For the Six Months Ended June 30, 2014 For the Six Months Ended June 30, 2013
    Unrealized Pension,     Unrealized Pension,  
  Qualified  Gains/(Losses)  SERP and    Qualified  Gains/(Losses)  SERP and   
  Cash Flow on Available- PBOP   Cash Flow on Available- PBOP  
  Hedging  for-Sale Benefit   Hedging  for-Sale Benefit  
(Millions of Dollars)Instruments Securities Plans Total Instruments Securities Plans Total
AOCI as of Beginning of Period (14.4)  0.4  (32.0)  (46.0)  (16.4)  1.3  (57.8)  (72.9)
                         
OCI Before Reclassifications  -   0.5   1.2   1.7   -   (0.7)   -   (0.7)
Amounts Reclassified from AOCI  1.0   -   1.8   2.8   1.0   -   3.1   4.1
Net OCI  1.0   0.5   3.0   4.5   1.0   (0.7)   3.1   3.4
AOCI as of End of Period$ (13.4) $ 0.9 $ (29.0) $ (41.5) $ (15.4) $ 0.6 $ (54.7) $ (69.5)

 For the Three Months Ended  For the Six Months Ended   
 June 30,  June 30,   
 Amounts Reclassified  Amounts Reclassified  Statements of Income
 from AOCI from AOCI Line Item Impacted
(Millions of Dollars)2014 2013 2014 2013  
Qualified Cash Flow Hedging Instruments$(0.8) $(0.8) $(1.7) $(1.7) Interest Expense
Tax Benefit 0.3  0.3  0.7  0.7 Income Tax Expense
Qualified Cash Flow Hedging Instruments, Net of Tax$(0.5) $(0.5) $(1.0) $(1.0)  
              
Pension, SERP and PBOP Benefit Plan Costs:             
Amortization of Actuarial Losses$(1.2) $(2.2) $(2.9) $(4.7) Operations and Maintenance (1)
Amortization of Prior Service Cost  -   -   (0.1)  (0.1) Operations and Maintenance (1)
Total Pension, SERP and PBOP Benefit Plan Costs (1.2)  (2.2)  (3.0)  (4.8)  
Tax Benefit 0.5  0.7  1.2  1.7 Income Tax Expense
Pension, SERP and PBOP Benefit Plan Costs, Net of Tax$(0.7) $(1.5) $(1.8) $(3.1)  
              
Total Amounts Reclassified from AOCI, Net of Tax$(1.2) $(2.0) $(2.8) $(4.1)