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Short-Term and Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2011
Long-term Debt, Current and Noncurrent [Abstract]  
Long-term Debt [Table Text Block]
Long-Term Debt
 
 
As of December 31
2011
2010
Millions
 
 
First Mortgage Bonds
 
 
4.86% Series Due 2013

$60.0


$60.0

6.94% Series Due 2014
18.0

18.0

7.70% Series Due 2016
20.0

20.0

8.17% Series Due 2019
42.0

42.0

5.28% Series Due 2020
35.0

35.0

4.85% Series Due 2021
15.0

15.0

4.95% Pollution Control Series F Due 2022
111.0

111.0

6.02% Series Due 2023
75.0

75.0

4.90% Series Due 2025
30.0

30.0

5.10% Series Due 2025
30.0

30.0

5.99% Series Due 2027
60.0

60.0

5.69% Series Due 2036
50.0

50.0

6.00% Series Due 2040
35.0

35.0

5.82% Series Due 2040
45.0

45.0

SWLP& First Mortgage Bonds 7.25% Series Due 2013
10.0

10.0

Senior Unsecured Notes 5.99% Due 2017
50.0

50.0

Variable Demand Revenue Refunding Bonds Series 1997 A, B, and C Due 2013 – 2020
28.2

28.3

Industrial Development Revenue Bonds 6.5% Due 2025
6.0

6.0

Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006 Due 2025
27.8

27.8

Unsecured Term Loan Variable Rate Due 2014
75.0

—

Other Long-Term Debt, 1.0% – 8.0% Due 2012 – 2037
40.3

36.9

Total Long-Term Debt
863.3

785.0

Less: Due Within One Year
5.4

13.4

Net Long-Term Debt

$857.9


$771.6