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Investments
 6 Months Ended
Jun. 30, 2015
Schedule of Investments [Line Items]  
Investments
INVESTMENTS
Unconsolidated Equity Investments - 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):
 
Alliant Energy
 
WPL
 
Three Months
 
Six Months
 
Three Months
 
Six Months
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
ATC

($10.9
)
 

($11.1
)
 

($18.7
)
 

($22.3
)
 

($10.9
)
 

($11.1
)
 

($18.7
)
 

($22.3
)
Other
(0.4
)
 
(0.2
)
 
0.9

 
(0.4
)
 
(0.4
)
 
(0.3
)
 
(0.4
)
 
(0.5
)
 

($11.3
)
 

($11.3
)
 

($17.8
)
 

($22.7
)
 

($11.3
)
 

($11.4
)
 

($19.1
)
 

($22.8
)
WPL [Member]  
Schedule of Investments [Line Items]  
Investments
INVESTMENTS
Unconsolidated Equity Investments - 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):
 
Alliant Energy
 
WPL
 
Three Months
 
Six Months
 
Three Months
 
Six Months
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
ATC

($10.9
)
 

($11.1
)
 

($18.7
)
 

($22.3
)
 

($10.9
)
 

($11.1
)
 

($18.7
)
 

($22.3
)
Other
(0.4
)
 
(0.2
)
 
0.9

 
(0.4
)
 
(0.4
)
 
(0.3
)
 
(0.4
)
 
(0.5
)
 

($11.3
)
 

($11.3
)
 

($17.8
)
 

($22.7
)
 

($11.3
)
 

($11.4
)
 

($19.1
)
 

($22.8
)