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Investments (Tables)
 6 Months Ended
Jun. 30, 2020
Schedule of Equity Method 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
 
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
)