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Investments
 6 Months Ended
Jun. 30, 2014
Schedule of Equity Method 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
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
ATC

($11.1
)
 

($10.6
)
 

($22.3
)
 

($20.9
)
 

($11.1
)
 

($10.6
)
 

($22.3
)
 

($20.9
)
Other
(0.2
)
 
(0.3
)
 
(0.4
)
 
(0.7
)
 
(0.3
)
 
(0.2
)
 
(0.5
)
 
(0.7
)
 

($11.3
)
 

($10.9
)
 

($22.7
)
 

($21.6
)
 

($11.4
)
 

($10.8
)
 

($22.8
)
 

($21.6
)


WPL’s Noncontrolling Interest - As of December 31, 2013, WPL, through its ownership interest in WPL Transco, held a 16% ownership interest in ATC. In January 2014, WPL Transco’s operating agreement was amended to allow ATI, a wholly-owned subsidiary of Resources, to become a member of WPL Transco in addition to WPL. In 2014, ATI began funding capital contributions that WPL Transco makes to ATC, and ATI is expected to continue to do so in the future. As of June 30, 2014, WPL’s noncontrolling interest reflects ATI’s ownership interest in WPL Transco, which was presented in total equity on WPL’s balance sheet.

As a result of ATI funding future capital contributions to ATC, WPL’s ownership interest in WPL Transco is expected to decrease over time and ATI’s ownership interest in WPL Transco is expected to increase over time. WPL Transco’s equity income from ATC and future ATC dividends received by WPL Transco will be allocated between WPL and ATI based on their respective ownership interests at the time the equity income is generated and at the time of the dividend payments. Alliant Energy’s aggregate investment in ATC is not expected to change as a result of WPL Transco’s amended operating agreement.
WPL [Member]
  
Schedule of Equity Method 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
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
ATC

($11.1
)
 

($10.6
)
 

($22.3
)
 

($20.9
)
 

($11.1
)
 

($10.6
)
 

($22.3
)
 

($20.9
)
Other
(0.2
)
 
(0.3
)
 
(0.4
)
 
(0.7
)
 
(0.3
)
 
(0.2
)
 
(0.5
)
 
(0.7
)
 

($11.3
)
 

($10.9
)
 

($22.7
)
 

($21.6
)
 

($11.4
)
 

($10.8
)
 

($22.8
)
 

($21.6
)


WPL’s Noncontrolling Interest - As of December 31, 2013, WPL, through its ownership interest in WPL Transco, held a 16% ownership interest in ATC. In January 2014, WPL Transco’s operating agreement was amended to allow ATI, a wholly-owned subsidiary of Resources, to become a member of WPL Transco in addition to WPL. In 2014, ATI began funding capital contributions that WPL Transco makes to ATC, and ATI is expected to continue to do so in the future. As of June 30, 2014, WPL’s noncontrolling interest reflects ATI’s ownership interest in WPL Transco, which was presented in total equity on WPL’s balance sheet.

As a result of ATI funding future capital contributions to ATC, WPL’s ownership interest in WPL Transco is expected to decrease over time and ATI’s ownership interest in WPL Transco is expected to increase over time. WPL Transco’s equity income from ATC and future ATC dividends received by WPL Transco will be allocated between WPL and ATI based on their respective ownership interests at the time the equity income is generated and at the time of the dividend payments. Alliant Energy’s aggregate investment in ATC is not expected to change as a result of WPL Transco’s amended operating agreement.