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Investments
 6 Months Ended
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
)