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Investments
 6 Months Ended
Jun. 30, 2016
Schedule of Investments [Line Items]  
Investments
INVESTMENTS
NOTE 5(a) 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
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
ATC

($8.8
)
 

($10.9
)
 

($19.5
)
 

($18.7
)
 

($8.8
)
 

($10.9
)
 

($19.5
)
 

($18.7
)
Other
(0.3
)
 
(0.4
)
 
(0.1
)
 
0.9

 
(0.2
)
 
(0.4
)
 
(0.2
)
 
(0.4
)
 

($9.1
)
 

($11.3
)
 

($19.6
)
 

($17.8
)
 

($9.0
)
 

($11.3
)
 

($19.7
)
 

($19.1
)


NOTE 5(b) Cash Surrender Value of Life Insurance Policies - During the six months ended June 30, 2016, certain of Alliant Energy’s and IPL’s company-owned life insurance policies were liquidated. The related proceeds of $31 million and $19 million were recorded in investing activities in Alliant Energy’s and IPL’s cash flows statements, respectively.
IPL [Member]  
Schedule of Investments [Line Items]  
Investments
INVESTMENTS
NOTE 5(a) 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
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
ATC

($8.8
)
 

($10.9
)
 

($19.5
)
 

($18.7
)
 

($8.8
)
 

($10.9
)
 

($19.5
)
 

($18.7
)
Other
(0.3
)
 
(0.4
)
 
(0.1
)
 
0.9

 
(0.2
)
 
(0.4
)
 
(0.2
)
 
(0.4
)
 

($9.1
)
 

($11.3
)
 

($19.6
)
 

($17.8
)
 

($9.0
)
 

($11.3
)
 

($19.7
)
 

($19.1
)


NOTE 5(b) Cash Surrender Value of Life Insurance Policies - During the six months ended June 30, 2016, certain of Alliant Energy’s and IPL’s company-owned life insurance policies were liquidated. The related proceeds of $31 million and $19 million were recorded in investing activities in Alliant Energy’s and IPL’s cash flows statements, respectively.
WPL [Member]  
Schedule of Investments [Line Items]  
Investments
INVESTMENTS
NOTE 5(a) 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
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
ATC

($8.8
)
 

($10.9
)
 

($19.5
)
 

($18.7
)
 

($8.8
)
 

($10.9
)
 

($19.5
)
 

($18.7
)
Other
(0.3
)
 
(0.4
)
 
(0.1
)
 
0.9

 
(0.2
)
 
(0.4
)
 
(0.2
)
 
(0.4
)
 

($9.1
)
 

($11.3
)
 

($19.6
)
 

($17.8
)
 

($9.0
)
 

($11.3
)
 

($19.7
)
 

($19.1
)