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Utility Regulatory Assets and Liabilities and Regulatory Matters - Regulatory Assets and Liabilities Associated with Gas Utility and Electric Utility (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2014 | Sep. 30, 2013 | Jun. 30, 2013
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Regulatory Assets and Liabilities Disclosure [Abstract] |  |  |
Regulatory assets | $ 242.6 | $ 244.9 | $ 320.9
Regulatory liabilities | 30.3 | 37.3 | 40.0
Postretirement benefits |  |  |
Regulatory Assets and Liabilities Disclosure [Abstract] |  |  |
Regulatory liabilities | 17.5 | 16.5 | 14.2
Environmental overcollections |  |  |
Regulatory Assets and Liabilities Disclosure [Abstract] |  |  |
Regulatory liabilities | 1.6 | 2.6 | 2.9
Deferred fuel and power refunds |  |  |
Regulatory Assets and Liabilities Disclosure [Abstract] |  |  |
Regulatory liabilities | 0 | 8.3 | 14.2
State tax benefits—distribution system repairs |  |  |
Regulatory Assets and Liabilities Disclosure [Abstract] |  |  |
Regulatory liabilities | 9.3 | 8.4 | 8.0
Other |  |  |
Regulatory Assets and Liabilities Disclosure [Abstract] |  |  |
Regulatory liabilities | 1.9 | 1.5 | 0.7
Income taxes recoverable |  |  |
Regulatory Assets and Liabilities Disclosure [Abstract] |  |  |
Regulatory assets | 107.2 | 106.1 | 104.7
Underfunded pension and postretirement plans |  |  |
Regulatory Assets and Liabilities Disclosure [Abstract] |  |  |
Regulatory assets | 89.2 | 94.5 | 177.8
Environmental costs |  |  |
Regulatory Assets and Liabilities Disclosure [Abstract] |  |  |
Regulatory assets | 14.6 | 17.1 | 16.6
Deferred fuel and power costs |  |  |
Regulatory Assets and Liabilities Disclosure [Abstract] |  |  |
Regulatory assets | 9.4 | 8.3 | 4.1
Removal costs, net |  |  |
Regulatory Assets and Liabilities Disclosure [Abstract] |  |  |
Regulatory assets | 15.6 | 13.3 | 12.1
Other |  |  |
Regulatory Assets and Liabilities Disclosure [Abstract] |  |  |
Regulatory assets | $ 6.6 | $ 5.6 | $ 5.6

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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 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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- 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 Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
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