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Utility Regulatory Assets and Liabilities and Regulatory Matters - Regulatory Assets and Liabilities Associated with Utilities (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013
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Regulatory Assets and Liabilities |  |
Regulatory assets | $ 268.2 | $ 244.9
Regulatory liabilities | 32.5 | 37.3
Postretirement Benefits |  |
Regulatory Assets and Liabilities |  |
Regulatory liabilities | 18.6 | 16.5
Environmental Overcollections |  |
Regulatory Assets and Liabilities |  |
Regulatory liabilities | 0.3 | 2.6
Deferred Fuel and Power Refunds |  |
Regulatory Assets and Liabilities |  |
Regulatory liabilities | 0.3 | 8.3
State Tax Benefits - Distribution System Repairs |  |
Regulatory Assets and Liabilities |  |
Regulatory liabilities | 10.1 | 8.4
Other Regulatory Liabilities |  |
Regulatory Assets and Liabilities |  |
Regulatory liabilities | 3.2 | 1.5
Income Taxes Recoverable |  |
Regulatory Assets and Liabilities |  |
Regulatory assets | 110.7 | 106.1
Underfunded Pension and Postretirement Plans |  |
Regulatory Assets and Liabilities |  |
Regulatory assets | 110.1 | 94.5
Environmental Costs |  |
Regulatory Assets and Liabilities |  |
Regulatory assets | 14.6 | 17.1
Deferred Fuel and Power Costs |  |
Regulatory Assets and Liabilities |  |
Regulatory assets | 11.8 | 8.3
Removal Costs, Net |  |
Regulatory Assets and Liabilities |  |
Regulatory assets | 16.8 | 13.3
Other Regulatory Assets |  |
Regulatory Assets and Liabilities |  |
Regulatory assets | $ 4.2 | $ 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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