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Utility Regulatory Assets and Liabilities and Regulatory Matters (Tables) | 6 Months Ended
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Mar. 31, 2015
Regulated Operations [Abstract] |
Regulatory Assets and Liabilities Associated with Gas Utility and Electric Utility | The following regulatory assets and liabilities associated with Utilities are included in our accompanying Condensed Consolidated Balance Sheets:
|  | March 31, 2015 |  | September 30, 2014 |  | March 31, 2014
Regulatory assets (a): |  |  |  |  |  |
Income taxes recoverable |  | $ | 111.5 |  |  | $ | 110.7 |  |  | $ | 106.8 |
Underfunded pension and postretirement plans |  | 105.5 |  |  | 110.1 |  |  | 91.0 |
Environmental costs |  | 14.1 |  |  | 14.6 |  |  | 14.5 |
Deferred fuel and power costs |  | — |  |  | 11.8 |  |  | 4.3 |
Removal costs, net |  | 18.4 |  |  | 16.8 |  |  | 14.4 |
Other |  | 3.1 |  |  | 4.2 |  |  | 4.9 |
Total regulatory assets |  | $ | 252.6 |  |  | $ | 268.2 |  |  | $ | 235.9 |
Regulatory liabilities (a): |  |  |  |  |  |
Postretirement benefits |  | $ | 19.3 |  |  | $ | 18.6 |  |  | $ | 17.2 |
Environmental overcollections |  | — |  |  | 0.3 |  |  | 1.9 |
Deferred fuel and power refunds |  | 40.6 |  |  | 0.3 |  |  | 3.2 |
State tax benefits—distribution system repairs |  | 10.6 |  |  | 10.1 |  |  | 9.0 |
Other |  | 2.1 |  |  | 3.2 |  |  | 1.8 |
Total regulatory liabilities |  | $ | 72.6 |  |  | $ | 32.5 |  |  | $ | 33.1 |
(a) Noncurrent regulatory assets are recorded in other assets and regulatory liabilities are recorded in other current and other noncurrent liabilities in the Condensed Consolidated Balance Sheets.

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- Definition Tabular disclosure of assets and liabilities that are created when regulatory agencies permit public utilities to defer certain costs or defer recognition of certain revenues included in rate-setting to the Balance Sheet. + References No definition available. + Details
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- Details
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