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Utility Regulatory Assets and Liabilities and Regulatory Matters - Regulatory Assets and Liabilities Associated with Utilities (Details) - USD ($) $ in Millions | Sep. 30, 2015 | Sep. 30, 2014
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Regulatory Assets and Liabilities |  |  |
Regulatory assets | [1] | $ 304.2 | $ 268.2
Regulatory liabilities | [1] | 71.0 | 32.5
Postretirement Benefits |  |  |
Regulatory Assets and Liabilities |  |  |
Regulatory liabilities | [1] | 20.0 | 18.6
Environmental Overcollections |  |  |
Regulatory Assets and Liabilities |  |  |
Regulatory liabilities | [1] |  | 0.3
Deferred Fuel and Power Refunds |  |  |
Regulatory Assets and Liabilities |  |  |
Regulatory liabilities | [1] | 36.6 | 0.3
State Tax Benefits — Distribution System Repairs |  |  |
Regulatory Assets and Liabilities |  |  |
Regulatory liabilities | [1] | 13.3 | 10.1
Other |  |  |
Regulatory Assets and Liabilities |  |  |
Regulatory liabilities | [1] | 1.1 | 3.2
Income Taxes Recoverable |  |  |
Regulatory Assets and Liabilities |  |  |
Regulatory assets | [1] | 115.9 | 110.7
Underfunded Pension and Postretirement Plans |  |  |
Regulatory Assets and Liabilities |  |  |
Regulatory assets | [1] | 140.8 | 110.1
Environmental Costs |  |  |
Regulatory Assets and Liabilities |  |  |
Regulatory assets | [1] | 20.0 | 14.6
Deferred Fuel and Power Costs |  |  |
Regulatory Assets and Liabilities |  |  |
Regulatory assets | [1] |  | 11.8
Removal Costs, Net |  |  |
Regulatory Assets and Liabilities |  |  |
Regulatory assets | [1] | 21.2 | 16.8
Other |  |  |
Regulatory Assets and Liabilities |  |  |
Regulatory assets | [1] | $ 6.3 | $ 4.2
[1] | Regulatory liabilities are recorded in other current and other noncurrent liabilities in the Consolidated Balance Sheets.

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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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