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Discontinued Operations (Tables) | 3 Months Ended
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Mar. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
Discontinued Operations in Income Statement | A summary of the components of discontinued operations in Alliant Energy’s income statements for the three months ended March 31 was as follows (in millions):
| 2017 |  | 2016
Operating expenses (income) |  | ($2.3 | ) |  |  | $1.9 |
Income (loss) before income taxes | 2.3 |  |  | (1.9 | )
Income tax expense (benefit) | 0.9 |  |  | (0.8 | )
Income (loss) from discontinued operations, net of tax |  | $1.4 |  |  |  | ($1.1 | )

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