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Short-term and Long-term Debt - Schedule of Long-Term Debt (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Total Long-term Debt $ 1,110.2 $ 1,018.1
Less: Due Within One Year 27.2 84.5
Net Long-Term Debt 1,083.0 933.6
4.86% Series Due 2013 [Member]
    
Debt Instrument [Line Items]    
Total Long-term Debt 0 60.0
Less: Due Within One Year   60.0
6.94% Series Due 2014 [Member]
    
Debt Instrument [Line Items]    
Total Long-term Debt 18.0 18.0
1.83% Series Due 2018 [Member]
    
Debt Instrument [Line Items]    
Total Long-term Debt 50.0 0
7.70% Series Due 2016 [Member]
    
Debt Instrument [Line Items]    
Total Long-term Debt 20.0 20.0
8.17% Series Due 2019 [Member]
    
Debt Instrument [Line Items]    
Total Long-term Debt 42.0 42.0
5.28% Series Due 2020 [Member]
    
Debt Instrument [Line Items]    
Total Long-term Debt 35.0 35.0
4.85% Series Due 2021 [Member]
    
Debt Instrument [Line Items]    
Total Long-term Debt 15.0 15.0
4.95% Pollution Control Series F Due 2022 [Member]
    
Debt Instrument [Line Items]    
Total Long-term Debt 111.0 111.0
6.02% Series Due 2023 [Member]
    
Debt Instrument [Line Items]    
Total Long-term Debt 75.0 75.0
4.90% Series Due 2025 [Member]
    
Debt Instrument [Line Items]    
Total Long-term Debt 30.0 30.0
5.10% Series Due 2025 [Member]
    
Debt Instrument [Line Items]    
Total Long-term Debt 30.0 30.0
3.20% Series Due 2026 [Member]
    
Debt Instrument [Line Items]    
Total Long-term Debt 75.0 75.0
5.99% Series Due 2027 [Member]
    
Debt Instrument [Line Items]    
Total Long-term Debt 60.0 60.0
3.30% Series Due 2028 [Member]
    
Debt Instrument [Line Items]    
Total Long-term Debt 40.0 0
5.69% Series Due 2036 [Member]
    
Debt Instrument [Line Items]    
Total Long-term Debt 50.0 50.0
6.00% Series Due 2040 [Member]
    
Debt Instrument [Line Items]    
Total Long-term Debt 35.0 35.0
5.82% Series Due 2040 [Member]
    
Debt Instrument [Line Items]    
Total Long-term Debt 45.0 45.0
4.08% Series Due 2042 [Member]
    
Debt Instrument [Line Items]    
Total Long-term Debt 85.0 85.0
4.21% Series Due 2043 [Member]
    
Debt Instrument [Line Items]    
Total Long-term Debt 60.0 0
SWL&P First Mortgage Bonds 7.25% Series Due 2013 [Member]
    
Debt Instrument [Line Items]    
Total Long-term Debt 0 10.0
SWL&P First Mortgage Bonds 4.15% Series Due 2028 [Member]
    
Debt Instrument [Line Items]    
Total Long-term Debt 15.0 0
Senior Unsecured Notes 5.99% Due 2017 [Member]
    
Debt Instrument [Line Items]    
Total Long-term Debt 50.0 50.0
Variable Demand Revenue Refunding Bonds Series 1997 A, B, and C Due 2013-2020 [Member]
    
Debt Instrument [Line Items]    
Total Long-term Debt 24.6 27.5
Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006 Due 2025 [Member]
    
Debt Instrument [Line Items]    
Total Long-term Debt 27.8 27.8
Unsecured Term Loan Variable Rate Due 2015 [Member]
    
Debt Instrument [Line Items]    
Total Long-term Debt 75.0 75.0
Other Long-Term Debt, 0.15%-7.50% Due 2014-2037 [Member]
    
Debt Instrument [Line Items]    
Total Long-term Debt $ 41.8 $ 41.8