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Utility Regulatory Assets and Liabilities and Regulatory Matters (Tables) | 3 Months Ended
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Dec. 31, 2015
Regulated Operations [Abstract] |
Regulatory Assets and Liabilities Associated with Gas Utility and Electric Utility | The following regulatory assets and liabilities associated with Gas Utility and Electric Utility are included in our accompanying Condensed Consolidated Balance Sheets:
|  | December 31, 2015 |  | September 30, 2015 |  | December 31, 2014
Regulatory assets: |  |  |  |  |  |
Income taxes recoverable |  | $ | 117.4 |  |  | $ | 115.9 |  |  | $ | 111.1 |
Underfunded pension and postretirement plans |  | 138.3 |  |  | 140.8 |  |  | 107.8 |
Environmental costs |  | 17.6 |  |  | 20.0 |  |  | 14.7 |
Deferred fuel and power costs |  | — |  |  | — |  |  | 16.7 |
Removal costs, net |  | 22.3 |  |  | 21.2 |  |  | 17.6 |
Other |  | 6.2 |  |  | 6.3 |  |  | 2.7 |
Total regulatory assets |  | $ | 301.8 |  |  | $ | 304.2 |  |  | $ | 270.6 |
Regulatory liabilities (a): |  |  |  |  |  |
Postretirement benefits |  | $ | 20.3 |  |  | $ | 20.0 |  |  | $ | 19.0 |
Deferred fuel and power refunds |  | 28.1 |  |  | 36.6 |  |  | — |
State tax benefits—distribution system repairs |  | 13.7 |  |  | 13.3 |  |  | 10.3 |
Other |  | 1.1 |  |  | 1.1 |  |  | 3.6 |
Total regulatory liabilities |  | $ | 63.2 |  |  | $ | 71.0 |  |  | $ | 32.9 |
(a) 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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