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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 | Dec. 31, 2015 | Sep. 30, 2015 | Dec. 31, 2014
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Regulatory Assets And Liabilities |  |  |  |
Regulatory assets |  | $ 301.8 | $ 304.2 | $ 270.6
Regulatory liabilities | [1] | 63.2 | 71.0 | 32.9
Postretirement Benefits |  |  |  |
Regulatory Assets And Liabilities |  |  |  |
Regulatory liabilities | [1] | 20.3 | 20.0 | 19.0
Deferred Fuel and Power Refunds |  |  |  |
Regulatory Assets And Liabilities |  |  |  |
Regulatory liabilities | [1] | 28.1 | 36.6 | 0.0
State Tax Benefits—Distribution System Repairs |  |  |  |
Regulatory Assets And Liabilities |  |  |  |
Regulatory liabilities | [1] | 13.7 | 13.3 | 10.3
Other |  |  |  |
Regulatory Assets And Liabilities |  |  |  |
Regulatory liabilities | [1] | 1.1 | 1.1 | 3.6
Income Taxes Recoverable |  |  |  |
Regulatory Assets And Liabilities |  |  |  |
Regulatory assets |  | 117.4 | 115.9 | 111.1
Underfunded Pension and Postretirement Plans |  |  |  |
Regulatory Assets And Liabilities |  |  |  |
Regulatory assets |  | 138.3 | 140.8 | 107.8
Environmental Costs |  |  |  |
Regulatory Assets And Liabilities |  |  |  |
Regulatory assets |  | 17.6 | 20.0 | 14.7
Deferred Fuel and Power Costs |  |  |  |
Regulatory Assets And Liabilities |  |  |  |
Regulatory assets |  | 0.0 | 0.0 | 16.7
Removal Costs, Net |  |  |  |
Regulatory Assets And Liabilities |  |  |  |
Regulatory assets |  | 22.3 | 21.2 | 17.6
Other |  |  |  |
Regulatory Assets And Liabilities |  |  |  |
Regulatory assets |  | $ 6.2 | $ 6.3 | $ 2.7
[1] | Regulatory liabilities are recorded in other current and other noncurrent liabilities in 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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