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Investments (Tables)
 12 Months Ended
Dec. 31, 2015
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, 2015
 
2015
 
2014
 
2015
 
2014
 
2013
Alliant Energy
 
 
 
 
 
 
 
 
 
 
 
ATC (a)
16%
 

$293.3

 

$286.5

 

($34.2
)
 

($41.9
)
 

($42.7
)
Wisconsin River Power Company
50%
 
8.7

 
7.8

 
(0.9
)
 
(0.9
)
 
(1.0
)
Other
Various
 
0.9

 
2.3

 
1.3

 
2.4

 
—

 
 
 

$302.9

 

$296.6

 

($33.8
)
 

($40.4
)
 

($43.7
)
WPL
 
 
 
 
 
 
 
 
 
 
 
ATC (a)
16%
 

$293.3

 

$286.5

 

($34.2
)
 

($41.9
)
 

($42.7
)
Wisconsin River Power Company
50%
 
8.7

 
7.8

 
(0.9
)
 
(0.9
)
 
(1.0
)
 
 
 

$302.0

 

$294.3

 

($35.1
)
 

($42.8
)
 

($43.7
)

(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
 
2015
 
2014
 
2013
 
2015
 
2014
 
2013
Operating revenues

$624

 

$643

 

$634

 

$624

 

$643

 

$634

Operating income
299

 
330

 
334

 
299

 
330

 
334

Net income
186

 
240

 
248

 
202

 
240

 
250

As of December 31:
 
 
 
 
 
 
 
 
 
 
 
Current assets
88

 
72

 
 
 
87

 
70

 
 
Non-current assets
3,987

 
3,773

 
 
 
3,977

 
3,747

 
 
Current liabilities
332

 
315

 
 
 
332

 
315

 
 
Non-current liabilities
2,052

 
1,871

 
 
 
2,052

 
1,870

 
 
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
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
Cash surrender value
$42.3
 
$47.0
 
$18.9
 
$18.1
 
$6.4
 
$11.4
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
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
Cash surrender value
$42.3
 
$47.0
 
$18.9
 
$18.1
 
$6.4
 
$11.4
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, 2015
 
2015
 
2014
 
2015
 
2014
 
2013
Alliant Energy
 
 
 
 
 
 
 
 
 
 
 
ATC (a)
16%
 

$293.3

 

$286.5

 

($34.2
)
 

($41.9
)
 

($42.7
)
Wisconsin River Power Company
50%
 
8.7

 
7.8

 
(0.9
)
 
(0.9
)
 
(1.0
)
Other
Various
 
0.9

 
2.3

 
1.3

 
2.4

 
—

 
 
 

$302.9

 

$296.6

 

($33.8
)
 

($40.4
)
 

($43.7
)
WPL
 
 
 
 
 
 
 
 
 
 
 
ATC (a)
16%
 

$293.3

 

$286.5

 

($34.2
)
 

($41.9
)
 

($42.7
)
Wisconsin River Power Company
50%
 
8.7

 
7.8

 
(0.9
)
 
(0.9
)
 
(1.0
)
 
 
 

$302.0

 

$294.3

 

($35.1
)
 

($42.8
)
 

($43.7
)

(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
 
2015
 
2014
 
2013
 
2015
 
2014
 
2013
Operating revenues

$624

 

$643

 

$634

 

$624

 

$643

 

$634

Operating income
299

 
330

 
334

 
299

 
330

 
334

Net income
186

 
240

 
248

 
202

 
240

 
250

As of December 31:
 
 
 
 
 
 
 
 
 
 
 
Current assets
88

 
72

 
 
 
87

 
70

 
 
Non-current assets
3,987

 
3,773

 
 
 
3,977

 
3,747

 
 
Current liabilities
332

 
315

 
 
 
332

 
315

 
 
Non-current liabilities
2,052

 
1,871

 
 
 
2,052

 
1,870

 
 
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
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
Cash surrender value
$42.3
 
$47.0
 
$18.9
 
$18.1
 
$6.4
 
$11.4