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Investments (Tables)
 12 Months Ended
Dec. 31, 2014
Investment [Line Items]  
Unconsolidated Equity Investments
Alliant Energy’s and WPL’s unconsolidated investments accounted for under the equity method of accounting are as follows (in millions):
 
Ownership
 
Carrying Value at
 
 
 
Interest at
 
December 31,
 
Equity (Income) / Loss
 
December 31, 2014
 
2014
 
2013
 
2014
 
2013
 
2012
Alliant Energy
 
 
 
 
 
 
 
 
 
 
 
ATC (a)
16%
 

$286.5

 

$272.1

 

($41.9
)
 

($42.7
)
 

($41.3
)
Wisconsin River Power Company
50%
 
7.8

 
7.0

 
(0.9
)
 
(1.0
)
 
(0.8
)
Other
Various
 
2.3

 
2.3

 
2.4

 
—

 
0.8

 
 
 

$296.6

 

$281.4

 

($40.4
)
 

($43.7
)
 

($41.3
)
WPL
 
 
 
 
 
 
 
 
 
 
 
ATC (a)
16%
 

$286.5

 

$272.1

 

($41.9
)
 

($42.7
)
 

($41.3
)
Wisconsin River Power Company
50%
 
7.8

 
7.0

 
(0.9
)
 
(1.0
)
 
(0.8
)
 
 
 

$294.3

 

$279.1

 

($42.8
)
 

($43.7
)
 

($42.1
)

(a)
Alliant Energy and WPL have the ability to exercise significant influence over ATC’s financial and operating policies through their participation on ATC’s Board of Directors. Refer to Note 18 for information regarding related party transactions with ATC.
Summary Financial Information
Summary aggregate financial information from the financial statements of these investments is as follows (in millions):
 
Alliant Energy
 
WPL
 
2014
 
2013
 
2012
 
2014
 
2013
 
2012
Operating revenues

$643

 

$634

 

$611

 

$643

 

$634

 

$611

Operating income
330

 
334

 
326

 
330

 
334

 
325

Net income
240

 
248

 
234

 
240

 
250

 
239

As of December 31:
 
 
 
 
 
 
 
 
 
 
 
Current assets
72

 
86

 
 
 
70

 
84

 
 
Non-current assets
3,773

 
3,553

 
 
 
3,747

 
3,527

 
 
Current liabilities
315

 
383

 
 
 
315

 
383

 
 
Non-current liabilities
1,871

 
1,682

 
 
 
1,870

 
1,681

 
 
Cash Surrender Value of Life Insurance Policies
At December 31, the cash surrender value of these investments was as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
Cash surrender value
$47.0
 
$46.5
 
$18.1
 
$17.3
 
$11.4
 
$12.3
IPL [Member]  
Investment [Line Items]  
Cash Surrender Value of Life Insurance Policies
At December 31, the cash surrender value of these investments was as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
Cash surrender value
$47.0
 
$46.5
 
$18.1
 
$17.3
 
$11.4
 
$12.3
WPL [Member]  
Investment [Line Items]  
Unconsolidated Equity Investments
Alliant Energy’s and WPL’s unconsolidated investments accounted for under the equity method of accounting are as follows (in millions):
 
Ownership
 
Carrying Value at
 
 
 
Interest at
 
December 31,
 
Equity (Income) / Loss
 
December 31, 2014
 
2014
 
2013
 
2014
 
2013
 
2012
Alliant Energy
 
 
 
 
 
 
 
 
 
 
 
ATC (a)
16%
 

$286.5

 

$272.1

 

($41.9
)
 

($42.7
)
 

($41.3
)
Wisconsin River Power Company
50%
 
7.8

 
7.0

 
(0.9
)
 
(1.0
)
 
(0.8
)
Other
Various
 
2.3

 
2.3

 
2.4

 
—

 
0.8

 
 
 

$296.6

 

$281.4

 

($40.4
)
 

($43.7
)
 

($41.3
)
WPL
 
 
 
 
 
 
 
 
 
 
 
ATC (a)
16%
 

$286.5

 

$272.1

 

($41.9
)
 

($42.7
)
 

($41.3
)
Wisconsin River Power Company
50%
 
7.8

 
7.0

 
(0.9
)
 
(1.0
)
 
(0.8
)
 
 
 

$294.3

 

$279.1

 

($42.8
)
 

($43.7
)
 

($42.1
)

(a)
Alliant Energy and WPL have the ability to exercise significant influence over ATC’s financial and operating policies through their participation on ATC’s Board of Directors. Refer to Note 18 for information regarding related party transactions with ATC.
Summary Financial Information
Summary aggregate financial information from the financial statements of these investments is as follows (in millions):
 
Alliant Energy
 
WPL
 
2014
 
2013
 
2012
 
2014
 
2013
 
2012
Operating revenues

$643

 

$634

 

$611

 

$643

 

$634

 

$611

Operating income
330

 
334

 
326

 
330

 
334

 
325

Net income
240

 
248

 
234

 
240

 
250

 
239

As of December 31:
 
 
 
 
 
 
 
 
 
 
 
Current assets
72

 
86

 
 
 
70

 
84

 
 
Non-current assets
3,773

 
3,553

 
 
 
3,747

 
3,527

 
 
Current liabilities
315

 
383

 
 
 
315

 
383

 
 
Non-current liabilities
1,871

 
1,682

 
 
 
1,870

 
1,681

 
 
Cash Surrender Value of Life Insurance Policies
At December 31, the cash surrender value of these investments was as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
Cash surrender value
$47.0
 
$46.5
 
$18.1
 
$17.3
 
$11.4
 
$12.3