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Investments and Acquisitions
 6 Months Ended
Jun. 30, 2019
Schedule of Investments [Line Items]  
Investments and Acquisitions INVESTMENTS AND ACQUISITIONS
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
 
2019
 
2018
 
2019
 
2018
ATC Holdings

($10.0
)
 

($7.8
)
 

($19.5
)
 

($16.5
)
Non-utility wind farm in Oklahoma
(1.3
)
 
(2.5
)
 
(2.4
)
 
(14.6
)
Other
(1.4
)
 
(0.2
)
 
(1.7
)
 
(0.7
)
 

($12.7
)
 

($10.5
)
 

($23.6
)
 

($31.8
)


Non-utility Transportation Acquisitions - In the first quarter of 2019, Alliant Energy, through its wholly-owned non-utility subsidiaries, completed acquisitions of freight management companies located in Cedar Rapids, Iowa and Stoughton, Wisconsin. These acquisitions were purchased for $21 million, including contingent consideration of $8 million, which is expected to be paid within two years. The purchase price was largely allocated to intangibles and the remainder was allocated to working capital and property.