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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 | Mar. 31, 2014 | Sep. 30, 2013 | Mar. 31, 2013
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Regulatory Assets and Liabilities Disclosure [Abstract] |  |  |
Regulatory assets | $ 235.9 | $ 244.9 | $ 322.3
Regulatory liabilities | 33.1 | 37.3 | 56.7
Postretirement benefits |  |  |
Regulatory Assets and Liabilities Disclosure [Abstract] |  |  |
Regulatory liabilities | 17.2 | 16.5 | 13.9
Environmental overcollections |  |  |
Regulatory Assets and Liabilities Disclosure [Abstract] |  |  |
Regulatory liabilities | 1.9 | 2.6 | 3.0
Deferred fuel and power refunds |  |  |
Regulatory Assets and Liabilities Disclosure [Abstract] |  |  |
Regulatory liabilities | 3.2 | 8.3 | 31.2
State tax benefits—distribution system repairs |  |  |
Regulatory Assets and Liabilities Disclosure [Abstract] |  |  |
Regulatory liabilities | 9.0 | 8.4 | 7.9
Other |  |  |
Regulatory Assets and Liabilities Disclosure [Abstract] |  |  |
Regulatory liabilities | 1.8 | 1.5 | 0.7
Income taxes recoverable |  |  |
Regulatory Assets and Liabilities Disclosure [Abstract] |  |  |
Regulatory assets | 106.8 | 106.1 | 104.2
Underfunded pension and postretirement plans |  |  |
Regulatory Assets and Liabilities Disclosure [Abstract] |  |  |
Regulatory assets | 91.0 | 94.5 | 181.3
Environmental costs |  |  |
Regulatory Assets and Liabilities Disclosure [Abstract] |  |  |
Regulatory assets | 14.5 | 17.1 | 16.8
Deferred fuel and power costs |  |  |
Regulatory Assets and Liabilities Disclosure [Abstract] |  |  |
Regulatory assets | 4.3 | 8.3 | 2.1
Removal costs, net |  |  |
Regulatory Assets and Liabilities Disclosure [Abstract] |  |  |
Regulatory assets | 14.4 | 13.3 | 11.9
Other |  |  |
Regulatory Assets and Liabilities Disclosure [Abstract] |  |  |
Regulatory assets | $ 4.9 | $ 5.6 | $ 6.0

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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 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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