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Investments (Tables)
 12 Months Ended
Dec. 31, 2013
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, 2013
 
2013
 
2012
 
2013
 
2012
 
2011
Alliant Energy
 
 
 
 
 
 
 
 
 
 
 
ATC (a)
16%
 

$272.1

 

$257.0

 

($42.7
)
 

($41.3
)
 

($37.8
)
Wisconsin River Power Company
50%
 
7.0

 
7.3

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

 
2.3

 
—

 
0.8

 
(0.6
)
 
 
 

$281.4

 

$266.6

 

($43.7
)
 

($41.3
)
 

($39.3
)
WPL
 
 
 
 
 
 
 
 
 
 
 
ATC (a)
16%
 

$272.1

 

$257.0

 

($42.7
)
 

($41.3
)
 

($37.8
)
Wisconsin River Power Company
50%
 
7.0

 
7.3

 
(1.0
)
 
(0.8
)
 
(0.9
)
 
 
 

$279.1

 

$264.3

 

($43.7
)
 

($42.1
)
 

($38.7
)

(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
 
2013
 
2012
 
2011
 
2013
 
2012
 
2011
Operating revenues

$634

 

$611

 

$575

 

$634

 

$611

 

$575

Operating income
334

 
326

 
307

 
334

 
325

 
308

Net income
248

 
234

 
218

 
250

 
239

 
226

As of December 31:
 
 
 
 
 
 
 
 
 
 
 
Current assets
86

 
67

 
 
 
84

 
66

 
 
Non-current assets
3,553

 
3,321

 
 
 
3,527

 
3,292

 
 
Current liabilities
383

 
252

 
 
 
383

 
252

 
 
Non-current liabilities
1,682

 
1,652

 
 
 
1,681

 
1,651

 
 
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
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Cash surrender value
$46.5
 
$50.5
 
$17.3
 
$16.0
 
$12.3
 
$12.1
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
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Cash surrender value
$46.5
 
$50.5
 
$17.3
 
$16.0
 
$12.3
 
$12.1
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, 2013
 
2013
 
2012
 
2013
 
2012
 
2011
Alliant Energy
 
 
 
 
 
 
 
 
 
 
 
ATC (a)
16%
 

$272.1

 

$257.0

 

($42.7
)
 

($41.3
)
 

($37.8
)
Wisconsin River Power Company
50%
 
7.0

 
7.3

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

 
2.3

 
—

 
0.8

 
(0.6
)
 
 
 

$281.4

 

$266.6

 

($43.7
)
 

($41.3
)
 

($39.3
)
WPL
 
 
 
 
 
 
 
 
 
 
 
ATC (a)
16%
 

$272.1

 

$257.0

 

($42.7
)
 

($41.3
)
 

($37.8
)
Wisconsin River Power Company
50%
 
7.0

 
7.3

 
(1.0
)
 
(0.8
)
 
(0.9
)
 
 
 

$279.1

 

$264.3

 

($43.7
)
 

($42.1
)
 

($38.7
)

(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
 
2013
 
2012
 
2011
 
2013
 
2012
 
2011
Operating revenues

$634

 

$611

 

$575

 

$634

 

$611

 

$575

Operating income
334

 
326

 
307

 
334

 
325

 
308

Net income
248

 
234

 
218

 
250

 
239

 
226

As of December 31:
 
 
 
 
 
 
 
 
 
 
 
Current assets
86

 
67

 
 
 
84

 
66

 
 
Non-current assets
3,553

 
3,321

 
 
 
3,527

 
3,292

 
 
Current liabilities
383

 
252

 
 
 
383

 
252

 
 
Non-current liabilities
1,682

 
1,652

 
 
 
1,681

 
1,651

 
 
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
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Cash surrender value
$46.5
 
$50.5
 
$17.3
 
$16.0
 
$12.3
 
$12.1