XML 46 R25.htm IDEA: XBRL DOCUMENT v3.10.0.1
Investments (Tables)
 9 Months Ended
Sep. 30, 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 and nine months ended September 30 was as follows (in millions):
 
Three Months
 
Nine Months
 
2018
 
2017
 
2018
 
2017
ATC Holdings

($8.9
)
 

($10.1
)
 

($25.4
)
 

($32.7
)
Non-utility wind farm in Oklahoma
0.1

 
0.2

 
(14.5
)
 
0.2

Other
(1.0
)
 
(0.2
)
 
(1.7
)
 
(0.4
)
 

($9.8
)
 

($10.1
)
 

($41.6
)
 

($32.9
)