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Discontinued Operations | 6 Months Ended
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Jun. 30, 2016
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 and six months ended June 30 was as follows (in millions):
| Three Months |  | Six Months
| 2016 |  | 2015 |  | 2016 |  | 2015
Operating expenses |  | $0.8 |  |  |  | $2.0 |  |  |  | $2.7 |  |  |  | $2.0 |
Loss before income taxes | (0.8 | ) |  | (2.0 | ) |  | (2.7 | ) |  | (2.0 | )
Income tax benefit | (0.3 | ) |  | (0.7 | ) |  | (1.1 | ) |  | (0.7 | )
Loss from discontinued operations, net of tax |  | ($0.5 | ) |  |  | ($1.3 | ) |  |  | ($1.6 | ) |  |  | ($1.3 | )
Refer to Note 13(d) for further discussion of warranty claims associated with RMT that have resulted in operating expenses subsequent to the sale.

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