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Investments and Acquisitions (Tables) | 6 Months Ended
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Jun. 30, 2019
Schedule of Investments [Line Items] |
Unconsolidated Equity Investments | Alliant Energy’s 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):
| Three Months |  | Six Months
| 2019 |  | 2018 |  | 2019 |  | 2018
ATC Holdings |  | ($10.0 | ) |  |  | ($7.8 | ) |  |  | ($19.5 | ) |  |  | ($16.5 | )
Non-utility wind farm in Oklahoma | (1.3 | ) |  | (2.5 | ) |  | (2.4 | ) |  | (14.6 | )
Other | (1.4 | ) |  | (0.2 | ) |  | (1.7 | ) |  | (0.7 | )
|  | ($12.7 | ) |  |  | ($10.5 | ) |  |  | ($23.6 | ) |  |  | ($31.8 | )

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