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Investments | 6 Months Ended
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Jun. 30, 2020
Schedule of Equity Method Investments [Line Items] |
Investments | INVESTMENTS 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
| 2020 |  | 2019 |  | 2020 |  | 2019
ATC Holdings |  | ($13.5 | ) |  |  | ($10.0 | ) |  |  | ($24.5 | ) |  |  | ($19.5 | )
Non-utility wind farm in Oklahoma | (1.9 | ) |  | (1.3 | ) |  | (4.1 | ) |  | (2.4 | )
Other | (2.0 | ) |  | (1.4 | ) |  | (2.2 | ) |  | (1.7 | )
|  | ($17.4 | ) |  |  | ($12.7 | ) |  |  | ($30.8 | ) |  |  | ($23.6 | )

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