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Investments
 9 Months Ended
Sep. 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 nine months ended September 30 was as follows (in millions):
 
Alliant Energy
 
WPL
 
Three Months
 
Nine Months
 
Three Months
 
Nine Months
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
ATC

($10.9
)
 

($11.2
)
 

($29.6
)
 

($33.5
)
 

($10.9
)
 

($11.2
)
 

($29.6
)
 

($33.5
)
Other
(0.2
)
 
(0.3
)
 
0.7

 
(0.7
)
 
(0.2
)
 
(0.2
)
 
(0.6
)
 
(0.7
)
 

($11.1
)
 

($11.5
)
 

($28.9
)
 

($34.2
)
 

($11.1
)
 

($11.4
)
 

($30.2
)
 

($34.2
)
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 nine months ended September 30 was as follows (in millions):
 
Alliant Energy
 
WPL
 
Three Months
 
Nine Months
 
Three Months
 
Nine Months
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
ATC

($10.9
)
 

($11.2
)
 

($29.6
)
 

($33.5
)
 

($10.9
)
 

($11.2
)
 

($29.6
)
 

($33.5
)
Other
(0.2
)
 
(0.3
)
 
0.7

 
(0.7
)
 
(0.2
)
 
(0.2
)
 
(0.6
)
 
(0.7
)
 

($11.1
)
 

($11.5
)
 

($28.9
)
 

($34.2
)
 

($11.1
)
 

($11.4
)
 

($30.2
)
 

($34.2
)