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Schedule of Long-Term Debt (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Debt Instrument [Line Items]
Long-term Debt	$ 863.3	$ 785.0
Long-term Debt, Current Maturities	5.4	13.4
Long-term Debt, Excluding Current Maturities	857.9	771.6
4.86% Series Due 2013 [Member]
Debt Instrument [Line Items]
Long-term Debt	60.0	60.0
6.94% Series Due 2014 [Member]
Debt Instrument [Line Items]
Long-term Debt	18.0	18.0
7.70% Series Due 2016 [Member]
Debt Instrument [Line Items]
Long-term Debt	20.0	20.0
8.17% Series Due 2019 [Member]
Debt Instrument [Line Items]
Long-term Debt	42.0	42.0
5.28% Series Due 2020 [Member]
Debt Instrument [Line Items]
Long-term Debt	35.0	35.0
4.85% Series Due 2021 [Member]
Debt Instrument [Line Items]
Long-term Debt	15.0	15.0
4.95% Pollution Control Series F Due 2022 [Member]
Debt Instrument [Line Items]
Long-term Debt	111.0	111.0
6.02% Series Due 2023 [Member]
Debt Instrument [Line Items]
Long-term Debt	75.0	75.0
4.90% Series Due 2025 [Member]
Debt Instrument [Line Items]
Long-term Debt	30.0	30.0
5.10% Series Due 2025 [Member]
Debt Instrument [Line Items]
Long-term Debt	30.0	30.0
5.99% Series Due 2027 [Member]
Debt Instrument [Line Items]
Long-term Debt	60.0	60.0
5.69% Series Due 2036 [Member]
Debt Instrument [Line Items]
Long-term Debt	50.0	50.0
6.00% Series Due 2040 [Member]
Debt Instrument [Line Items]
Long-term Debt	35.0	35.0
5.82% Series Due 2040 [Member]
Debt Instrument [Line Items]
Long-term Debt	45.0	45.0
7.25% Series Due 2013 [Member]
Debt Instrument [Line Items]
Long-term Debt	10.0	10.0
Senior Unsecured Notes 5.99% Due 2017 [Member]
Debt Instrument [Line Items]
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]
Long-term Debt	28.2	28.3
Industrial Development Revenue Bonds 6.5% Due 2025 [Member]
Debt Instrument [Line Items]
Long-term Debt	6.0	6.0
Industrial Development Variable Rate Demand Refunding Revenue Bonds Series 2006 Due 2025 [Member]
Debt Instrument [Line Items]
Long-term Debt	27.8	27.8
Unsecured Term Loan Variable Rate Due 2014 [Member] [Domain]
Debt Instrument [Line Items]
Long-term Debt	75.0	0
Other Long-Term Debt, 1.0%-8.0% Due 2012-2037 [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 40.3	$ 36.9

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Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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Total of the portions of the carrying amounts as of the balance sheet date of long-term debt, which may include notes payable, bonds payable, debentures, mortgage loans, and commercial paper, which are scheduled to be repaid within one year or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year (current maturities) or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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