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Utility Regulatory Assets and Liabilities and Regulatory Matters (Details Textual) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Sep. 30, 2013 | Dec. 31, 2012
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Regulatory Assets [Line Items] |  |  |
Gas utility unrealized gains or losses on derivative financial instruments contracts | $ 2.0 | $ (1.7) | $ (0.4)
Fair Value of Electric Utility Electricity Supply Contracts | $ (3.2) | $ (4.8) | $ 8.2

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- Definition Fair value of electric utility electricity supply contracts. + References No definition available. + Details
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- Definition Unrealized gains or losses on derivative financial instruments contracts. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Details
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