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Investments (Tables) | 6 Months Ended
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Jun. 30, 2014
Schedule of Investments [Line Items] |
Unconsolidated Equity Investments | Equity (income) loss from unconsolidated investments accounted for under the equity method of accounting for the three and six months ended June 30 was as follows (in millions):
| Alliant Energy |  | WPL
| Three Months |  | Six Months |  | Three Months |  | Six Months
| 2014 |  | 2013 |  | 2014 |  | 2013 |  | 2014 |  | 2013 |  | 2014 |  | 2013
ATC |  | ($11.1 | ) |  |  | ($10.6 | ) |  |  | ($22.3 | ) |  |  | ($20.9 | ) |  |  | ($11.1 | ) |  |  | ($10.6 | ) |  |  | ($22.3 | ) |  |  | ($20.9 | )
Other | (0.2 | ) |  | (0.3 | ) |  | (0.4 | ) |  | (0.7 | ) |  | (0.3 | ) |  | (0.2 | ) |  | (0.5 | ) |  | (0.7 | )
|  | ($11.3 | ) |  |  | ($10.9 | ) |  |  | ($22.7 | ) |  |  | ($21.6 | ) |  |  | ($11.4 | ) |  |  | ($10.8 | ) |  |  | ($22.8 | ) |  |  | ($21.6 | )
WPL [Member] |
Schedule of Investments [Line Items] |
Unconsolidated Equity Investments | Equity (income) loss from unconsolidated investments accounted for under the equity method of accounting for the three and six months ended June 30 was as follows (in millions):
| Alliant Energy |  | WPL
| Three Months |  | Six Months |  | Three Months |  | Six Months
| 2014 |  | 2013 |  | 2014 |  | 2013 |  | 2014 |  | 2013 |  | 2014 |  | 2013
ATC |  | ($11.1 | ) |  |  | ($10.6 | ) |  |  | ($22.3 | ) |  |  | ($20.9 | ) |  |  | ($11.1 | ) |  |  | ($10.6 | ) |  |  | ($22.3 | ) |  |  | ($20.9 | )
Other | (0.2 | ) |  | (0.3 | ) |  | (0.4 | ) |  | (0.7 | ) |  | (0.3 | ) |  | (0.2 | ) |  | (0.5 | ) |  | (0.7 | )
|  | ($11.3 | ) |  |  | ($10.9 | ) |  |  | ($22.7 | ) |  |  | ($21.6 | ) |  |  | ($11.4 | ) |  |  | ($10.8 | ) |  |  | ($22.8 | ) |  |  | ($21.6 | )

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- Definition Tabular disclosure of equity method investments including, but not limited to, name of each investee or group of investments, percentage ownership, difference between recorded amount of an investment and the value of the underlying equity in the net assets, and summarized financial information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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