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Investments and Acquisitions (Tables)
 9 Months Ended
Sep. 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 nine months ended September 30 was as follows (in millions):
 
Three Months
 
Nine Months
 
2019
 
2018
 
2019
 
2018
ATC Holdings

($10.5
)
 

($8.9
)
 

($30.0
)
 

($25.4
)
Non-utility wind farm in Oklahoma
(0.4
)
 
0.1

 
(2.8
)
 
(14.5
)
Other
(0.7
)
 
(1.0
)
 
(2.4
)
 
(1.7
)
 

($11.6
)
 

($9.8
)
 

($35.2
)
 

($41.6
)