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Investments
 3 Months Ended
Mar. 31, 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 months ended March 31 was as follows (in millions):
 
Alliant Energy
 
WPL
 
2016
 
2015
 
2016
 
2015
ATC

($10.7
)
 

($7.8
)
 

($10.7
)
 

($7.8
)
Other
0.2

 
1.3

 
—

 
—

 

($10.5
)
 

($6.5
)
 

($10.7
)
 

($7.8
)


NOTE 5(b) Cash Surrender Value of Life Insurance Policies - During the three months ended March 31, 2016, certain of Alliant Energy’s and IPL’s company-owned life insurance policies were liquidated. The related proceeds of $26 million and $18 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 months ended March 31 was as follows (in millions):
 
Alliant Energy
 
WPL
 
2016
 
2015
 
2016
 
2015
ATC

($10.7
)
 

($7.8
)
 

($10.7
)
 

($7.8
)
Other
0.2

 
1.3

 
—

 
—

 

($10.5
)
 

($6.5
)
 

($10.7
)
 

($7.8
)


NOTE 5(b) Cash Surrender Value of Life Insurance Policies - During the three months ended March 31, 2016, certain of Alliant Energy’s and IPL’s company-owned life insurance policies were liquidated. The related proceeds of $26 million and $18 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 months ended March 31 was as follows (in millions):
 
Alliant Energy
 
WPL
 
2016
 
2015
 
2016
 
2015
ATC

($10.7
)
 

($7.8
)
 

($10.7
)
 

($7.8
)
Other
0.2

 
1.3

 
—

 
—

 

($10.5
)
 

($6.5
)
 

($10.7
)
 

($7.8
)


NOTE 5(b) Cash Surrender Value of Life Insurance Policies - During the three months ended March 31, 2016, certain of Alliant Energy’s and IPL’s company-owned life insurance policies were liquidated. The related proceeds of $26 million and $18 million were recorded in investing activities in Alliant Energy’s and IPL’s cash flows statements, respectively.