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Investments
 6 Months Ended
Jun. 30, 2018
Schedule of 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
 
2018
 
2017
 
2018
 
2017
ATC Holdings

($7.8
)
 

($11.1
)
 

($16.5
)
 

($22.6
)
Non-utility wind farm in Oklahoma
(2.5
)
 
—

 
(14.6
)
 
—

Other
(0.2
)
 
(0.2
)
 
(0.7
)
 
(0.2
)
 

($10.5
)
 

($11.3
)
 

($31.8
)
 

($22.8
)


Non-utility Wind Farm in Oklahoma - Alliant Energy’s interest in a non-utility wind farm in Oklahoma commenced in July 2017. As a result, there was no corresponding equity income recognized during the three and six months ended June 30, 2017. The equity income recognized in the first half of 2018 was primarily related to the impacts of Federal Tax Reform. The liquidation method utilized to recognize Alliant Energy’s share of the wind farm’s earnings includes utilizing the federal income tax rate in effect as of the end of the measurement period. The lower federal income tax rate effective as of January 1, 2018 resulted in an acceleration of earnings attributable to Alliant Energy’s interest in the Oklahoma wind farm. This increase in earnings is expected to reverse over time.