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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 | Jun. 30, 2016 | Sep. 30, 2015 | Jun. 30, 2015
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Regulatory Assets And Liabilities |  |  |  |
Regulatory assets |  | $ 345.3 | $ 304.2 | $ 254.2
Regulatory liabilities | [1] | 69.9 | 71.0 | 77.5
Postretirement benefits |  |  |  |
Regulatory Assets And Liabilities |  |  |  |
Regulatory liabilities | [1] | 19.7 | 20.0 | 19.6
Deferred fuel and power refunds |  |  |  |
Regulatory Assets And Liabilities |  |  |  |
Regulatory liabilities | [1] | 34.4 | 36.6 | 45.6
State tax benefits—distribution system repairs |  |  |  |
Regulatory Assets And Liabilities |  |  |  |
Regulatory liabilities | [1] | 14.6 | 13.3 | 10.9
Other |  |  |  |
Regulatory Assets And Liabilities |  |  |  |
Regulatory liabilities | [1] | 1.2 | 1.1 | 1.4
Income taxes recoverable |  |  |  |
Regulatory Assets And Liabilities |  |  |  |
Regulatory assets |  | 119.6 | 115.9 | 111.8
Underfunded pension and postretirement plans |  |  |  |
Regulatory Assets And Liabilities |  |  |  |
Regulatory assets |  | 133.4 | 140.8 | 103.2
Environmental costs |  |  |  |
Regulatory Assets And Liabilities |  |  |  |
Regulatory assets | [2] | 60.7 | 20.0 | 14.5
Removal costs, net |  |  |  |
Regulatory Assets And Liabilities |  |  |  |
Regulatory assets |  | 22.4 | 21.2 | 19.6
Other |  |  |  |
Regulatory Assets And Liabilities |  |  |  |
Regulatory assets |  | $ 9.2 | $ 6.3 | $ 5.1
[1] | Regulatory liabilities are recorded in other current and other noncurrent liabilities on the Condensed Consolidated Balance Sheets.
[2] | Environmental costs at June 30, 2016, include amounts probable of recovery recorded in conjunction with UGI Gas’ Consent Order and Agreement with the Pennsylvania Department of Environmental Protection (see Note 9).

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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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