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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 16 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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