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Investments
 3 Months Ended
Mar. 31, 2013
Schedule of Equity Method Investments [Line Items]  
Investments
INVESTMENTS
Unconsolidated Equity Investments - Equity (income) loss from Alliant Energy’s and WPL’s unconsolidated investments accounted for under the equity method of accounting for the three months ended March 31 was as follows (in millions):
 
Alliant Energy
 
WPL
 
2013
 
2012
 
2013
 
2012
American Transmission Company LLC (ATC)

($10.3
)
 

($9.9
)
 

($10.3
)
 

($9.9
)
Other
(0.4
)
 
0.5

 
(0.5
)
 
(0.2
)
 

($10.7
)
 

($9.4
)
 

($10.8
)
 

($10.1
)


Summary financial information from the unaudited financial statements of ATC for the three months ended March 31 was as follows (in millions):
 
2013
 
2012
Operating revenues
$151.7
 
$147.7
Operating income
82.0
 
78.1
Net income
60.5
 
58.1
WPL [Member]
  
Schedule of Equity Method Investments [Line Items]  
Investments
INVESTMENTS
Unconsolidated Equity Investments - Equity (income) loss from Alliant Energy’s and WPL’s unconsolidated investments accounted for under the equity method of accounting for the three months ended March 31 was as follows (in millions):
 
Alliant Energy
 
WPL
 
2013
 
2012
 
2013
 
2012
American Transmission Company LLC (ATC)

($10.3
)
 

($9.9
)
 

($10.3
)
 

($9.9
)
Other
(0.4
)
 
0.5

 
(0.5
)
 
(0.2
)
 

($10.7
)
 

($9.4
)
 

($10.8
)
 

($10.1
)


Summary financial information from the unaudited financial statements of ATC for the three months ended March 31 was as follows (in millions):
 
2013
 
2012
Operating revenues
$151.7
 
$147.7
Operating income
82.0
 
78.1
Net income
60.5
 
58.1