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Discontinued Operations | 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 and Assets and Liabilities Held For Sale | DISCONTINUED OPERATIONS In 2013, Alliant Energy sold RMT to narrow its strategic focus and risk profile. The operating results of RMT have been separately classified and reported as discontinued operations in Alliant Energy’s income statements. 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 | )
Refer to Note 12(d) for further discussion of warranty claims associated with RMT that have resulted in operating expenses and income subsequent to the sale.

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