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Discontinued Operations (Tables) | 12 Months Ended
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Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
Components Of Discontinued Operations In Consolidated Statements Of Income | A summary of the components of discontinued operations in Alliant Energy’s income statements was as follows (in millions):
| 2016 |  | 2015 |  | 2014
Operating expenses |  | $3.9 |  |  |  | $4.0 |  |  |  | $3.7 |
Loss before income taxes | (3.9 | ) |  | (4.0 | ) |  | (3.7 | )
Income tax benefit | (1.6 | ) |  | (1.5 | ) |  | (1.3 | )
Loss from discontinued operations, net of tax |  | ($2.3 | ) |  |  | ($2.5 | ) |  |  | ($2.4 | )

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