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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 | Mar. 31, 2017 | Sep. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2015
--- | --- | --- | --- | ---
Regulatory Assets |  |  |  |  |
Regulatory assets |  | $ 394.7 | $ 395.1 | $ 348.2 |
Regulatory Liabilities |  |  |  |  |
Regulatory liabilities | [1] | 50.5 | 55.6 | 66.8 |
Postretirement benefits |  |  |  |  |
Regulatory Liabilities |  |  |  |  |
Regulatory liabilities | [1] | 17.0 | 17.5 | 19.3 |
Deferred fuel and power refunds |  |  |  |  |
Regulatory Liabilities |  |  |  |  |
Regulatory liabilities | [1] | 13.8 | 22.3 | 30.8 |
State tax benefits — distribution system repairs |  |  |  |  |
Regulatory Liabilities |  |  |  |  |
Regulatory liabilities | [1] | 16.1 | 15.1 | 14.2 |
Other |  |  |  |  |
Regulatory Liabilities |  |  |  |  |
Regulatory liabilities | [1] | 3.6 | 0.7 | 2.5 |
Income taxes recoverable |  |  |  |  |
Regulatory Assets |  |  |  |  |
Regulatory assets |  | 120.3 | 115.7 | 118.2 |
Underfunded pension and postretirement plans |  |  |  |  |
Regulatory Assets |  |  |  |  |
Regulatory assets |  | 175.6 | 183.1 | 135.8 |
Environmental costs |  |  |  |  |
Regulatory Assets |  |  |  |  |
Regulatory assets |  | 62.2 | 59.4 | 60.5 |
Deferred fuel and power costs |  |  |  |  |
Regulatory Assets |  |  |  |  |
Regulatory assets |  | 1.3 |  | 0.0 | $ 0.1
Removal costs, net |  |  |  |  |
Regulatory Assets |  |  |  |  |
Regulatory assets |  | 28.8 | 27.9 | 25.0 |
Other |  |  |  |  |
Regulatory Assets |  |  |  |  |
Regulatory assets |  | $ 6.5 | $ 8.9 | $ 8.7 |
[1] | Regulatory liabilities are recorded in “Other current liabilities” and “Other noncurrent liabilities” on the Condensed 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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