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Investments
 3 Months Ended
Mar. 31, 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 months ended March 31 was as follows (in millions):
 
2020
 
2019
ATC Holdings

($11.0
)
 

($9.5
)
Non-utility wind farm in Oklahoma
(2.2
)
 
(1.1
)
Other
(0.2
)
 
(0.3
)
 

($13.4
)
 

($10.9
)