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CONDENSED CONSOLIDATED STATEMENTS OF CAPITALIZATION (USD $)
In Millions, except Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Schedule of Capitalization    
Common stock - $4 par value; 32,000,000 shares authorized; 23,896,962 shares outstanding $ 95.6 $ 95.6
Additional paid-in capital 553.9 626.7
Retained earnings 434.5 424.9
Total common stock equity 1,084.0 1,147.2
Cumulative; $100 par value; 1,000,000 shares authorized with no mandatory redemption - 511,882  
Total preferred stock 51.2 51.2
Total long-term debt to parent 8.3 8.6
Long-term debt    
Total First Mortgage Bonds and Senior Notes 872.1 872.1
Unamortized discount on long-term debt (0.9) (1.0)
Total 871.2 871.1
Current portion (150.0) (150.0)
Total long-term debt 721.2 721.1
Total capitalization 1,864.7 1,928.1
Preferred stock, 5.00% Series
   
Schedule of Capitalization    
Preferred stock, Dividend Rate, (as a percent) 5.00%  
Cumulative; $100 par value; 1,000,000 shares authorized with no mandatory redemption - 131,916  
Total preferred stock 13.2 13.2
Preferred stock, 5.04% Series
   
Schedule of Capitalization    
Preferred stock, Dividend Rate, (as a percent) 5.04%  
Cumulative; $100 par value; 1,000,000 shares authorized with no mandatory redemption - 29,983  
Total preferred stock 3.0 3.0
Preferred stock, 5.08% Series
   
Schedule of Capitalization    
Preferred stock, Dividend Rate, (as a percent) 5.08%  
Cumulative; $100 par value; 1,000,000 shares authorized with no mandatory redemption - 49,983  
Total preferred stock 5.0 5.0
Preferred stock, 6.76% Series
   
Schedule of Capitalization    
Preferred stock, Dividend Rate, (as a percent) 6.76%  
Cumulative; $100 par value; 1,000,000 shares authorized with no mandatory redemption - 150,000  
Total preferred stock 15.0 15.0
Preferred stock, 6.88% Series
   
Schedule of Capitalization    
Preferred stock, Dividend Rate, (as a percent) 6.88%  
Cumulative; $100 par value; 1,000,000 shares authorized with no mandatory redemption - 150,000  
Total preferred stock 15.0 15.0
Long-term debt to parent, 8.76% Series, Year Due, 2015
   
Schedule of Capitalization    
Interest rate, (as a percent) 8.76%  
Total long-term debt to parent 3.3 3.4
Long-term debt to parent, 7.35% Series, Year Due, 2016
   
Schedule of Capitalization    
Interest rate, (as a percent) 7.35%  
Total long-term debt to parent 5.0 5.2
Long-term debt, 7.125% Series, Year Due, 2023
   
Schedule of Capitalization    
Interest rate, (as a percent) 7.125%  
Long-term debt    
First Mortgage Bonds 0.1 0.1
Long-term debt, 6.125% Series, Year Due, 2011
   
Schedule of Capitalization    
Interest rate, (as a percent) 6.125%  
Long-term debt    
Senior Notes 150.0 150.0
Long-term debt, 4.875% Series, Year Due, 2012
   
Schedule of Capitalization    
Interest rate, (as a percent) 4.875%  
Long-term debt    
Senior Notes 150.0 150.0
Long-term debt, 3.95% Series, Year Due, 2013
   
Schedule of Capitalization    
Interest rate, (as a percent) 3.95%  
Long-term debt    
Senior Notes 22.0 22.0
Long-term debt, 4.80% Series, Year Due, 2013
   
Schedule of Capitalization    
Interest rate, (as a percent) 4.80%  
Long-term debt    
Senior Notes 125.0 125.0
Long-term debt, 6.375% Series, Year Due, 2015
   
Schedule of Capitalization    
Interest rate, (as a percent) 6.375%  
Long-term debt    
Senior Notes 125.0 125.0
Long-term debt, 5.65% Series, Year Due, 2017
   
Schedule of Capitalization    
Interest rate, (as a percent) 5.65%  
Long-term debt    
Senior Notes 125.0 125.0
Long-term debt, 6.08% Series, Year Due, 2028
   
Schedule of Capitalization    
Interest rate, (as a percent) 6.08%  
Long-term debt    
Senior Notes 50.0 50.0
Long-term debt, 5.55% Series, Year Due, 2036
   
Schedule of Capitalization    
Interest rate, (as a percent) 5.55%  
Long-term debt    
Senior Notes $ 125.0 $ 125.0