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Investments (Tables)
 3 Months Ended
Mar. 31, 2018
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 months ended March 31 was as follows (in millions):
 
2018
 
2017
ATC Holdings

($8.7
)
 

($11.5
)
Non-utility wind farm in Oklahoma
(12.1
)
 
—

Other
(0.5
)
 
—

 

($21.3
)
 

($11.5
)