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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, 2016 | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Regulatory Assets |  |  |  |
Regulatory assets |  | $ 392.9 | $ 395.1 | $ 301.8
Regulatory Liabilities |  |  |  |
Regulatory liabilities | [1] | 58.7 | 55.6 | 63.2
Postretirement benefits |  |  |  |
Regulatory Liabilities |  |  |  |
Regulatory liabilities | [1] | 17.3 | 17.5 | 20.3
Deferred fuel and power refunds |  |  |  |
Regulatory Liabilities |  |  |  |
Regulatory liabilities | [1] | 23.8 | 22.3 | 28.1
State tax benefits—distribution system repairs |  |  |  |
Regulatory Liabilities |  |  |  |
Regulatory liabilities | [1] | 15.6 | 15.1 | 13.7
Other |  |  |  |
Regulatory Liabilities |  |  |  |
Regulatory liabilities | [1] | 2.0 | 0.7 | 1.1
Income taxes recoverable |  |  |  |
Regulatory Assets |  |  |  |
Regulatory assets |  | 117.8 | 115.7 | 117.4
Underfunded pension and postretirement plans |  |  |  |
Regulatory Assets |  |  |  |
Regulatory assets |  | 179.4 | 183.1 | 138.3
Environmental costs |  |  |  |
Regulatory Assets |  |  |  |
Regulatory assets |  | 61.4 | 59.4 | 17.6
Removal costs, net |  |  |  |
Regulatory Assets |  |  |  |
Regulatory assets |  | 27.1 | 27.9 | 22.3
Other |  |  |  |
Regulatory Assets |  |  |  |
Regulatory assets |  | $ 7.2 | $ 9.0 | $ 6.2
[1] | Regulatory liabilities are recorded in “other current liabilities” and “other noncurrent liabilities” on the Condensed Consolidated Balance Sheets.

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