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Utility Regulatory Assets and Liabilities and Regulatory Matters (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Sep. 30, 2012 | Dec. 31, 2011
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Regulatory Assets and Liabilities Disclosure [Abstract] |  |  |
Regulatory Assets | $ 330.6 | $ 338.4 | $ 301.5
Regulatory Liabilities | 26.8 | 28.3 | 28.4
Postretirement benefits [Member] |  |  |
Regulatory Assets and Liabilities Disclosure [Abstract] |  |  |
Regulatory Liabilities | 13.5 | 13.1 | 11.8
Environmental overcollections [Member] |  |  |
Regulatory Assets and Liabilities Disclosure [Abstract] |  |  |
Regulatory Liabilities | 3.1 | 2.9 | 4.7
Deferred fuel and power refunds [Member] |  |  |
Regulatory Assets and Liabilities Disclosure [Abstract] |  |  |
Regulatory Liabilities | 1.9 | 4.4 | 5.0
State tax benefits - distribution system repairs [Member] |  |  |
Regulatory Assets and Liabilities Disclosure [Abstract] |  |  |
Regulatory Liabilities | 7.7 | 7.4 | 6.5
Other [Member] |  |  |
Regulatory Assets and Liabilities Disclosure [Abstract] |  |  |
Regulatory Liabilities | 0.6 | 0.5 | 0.4
Income taxes recoverable [Member] |  |  |
Regulatory Assets and Liabilities Disclosure [Abstract] |  |  |
Regulatory Assets | 103.7 | 103.2 | 98.7
Underfunded pension and postretirement plans [Member] |  |  |
Regulatory Assets and Liabilities Disclosure [Abstract] |  |  |
Regulatory Assets | 184.8 | 188.2 | 148.7
Environmental costs [Member] |  |  |
Regulatory Assets and Liabilities Disclosure [Abstract] |  |  |
Regulatory Assets | 17.1 | 16.8 | 19.4
Deferred fuel and power costs [Member] |  |  |
Regulatory Assets and Liabilities Disclosure [Abstract] |  |  |
Regulatory Assets | 7.8 | 11.6 | 14.8
Removal costs, net [Member] |  |  |
Regulatory Assets and Liabilities Disclosure [Abstract] |  |  |
Regulatory Assets | 11.5 | 12.7 | 11.9
Other [Member] |  |  |
Regulatory Assets and Liabilities Disclosure [Abstract] |  |  |
Regulatory Assets | $ 5.7 | $ 5.9 | $ 8.0

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- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 71 -Paragraph 9, 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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- Details
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- Definition The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 71 -Paragraph 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant