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Investments (Tables)
 12 Months Ended
Dec. 31, 2016
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 Interest at
 
Carrying Value at December 31,
 
Equity (Income) / Loss
 
December 31, 2016
 
2016
 
2015
 
2016
 
2015
 
2014
Alliant Energy
 
 
 
 
 
 
 
 
 
 
 
ATC (a)
16%
 

$317.6

 

$293.3

 

($39.1
)
 

($34.2
)
 

($41.9
)
Other
Various
 
8.4

 
9.6

 
(0.5
)
 
0.4

 
1.5

 
 
 

$326.0

 

$302.9

 

($39.6
)
 

($33.8
)
 

($40.4
)
WPL
 
 
 
 
 
 
 
 
 
 
 
ATC
—%
 

$—

 

$293.3

 

($39.1
)
 

($34.2
)
 

($41.9
)
Wisconsin River Power Company
50%
 
7.7

 
8.7

 
(0.7
)
 
(0.9
)
 
(0.9
)
 
 
 

$7.7

 

$302.0

 

($39.8
)
 

($35.1
)
 

($42.8
)

(a)
Alliant Energy currently has the ability to exercise significant influence over ATC’s financial and operating policies through its 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
 
2016
 
2015
 
2014
 
2016
 
2015
 
2014
Operating revenues

$658

 

$624

 

$643

 

$658

 

$624

 

$643

Operating income
331

 
299

 
330

 
331

 
299

 
330

Net income
232

 
186

 
240

 
234

 
202

 
240

As of December 31:
 
 
 
 
 
 
 
 
 
 
 
Current assets
82

 
88

 
 
 
6

 
87

 
 
Non-current assets
4,340

 
3,987

 
 
 
19

 
3,977

 
 
Current liabilities
498

 
332

 
 
 
3

 
332

 
 
Non-current liabilities
2,144

 
2,052

 
 
 
7

 
2,052

 
 
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
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Cash surrender value
$10.6
 
$42.3
 
$—
 
$18.9
 
$5.8
 
$6.4
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
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Cash surrender value
$10.6
 
$42.3
 
$—
 
$18.9
 
$5.8
 
$6.4
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 Interest at
 
Carrying Value at December 31,
 
Equity (Income) / Loss
 
December 31, 2016
 
2016
 
2015
 
2016
 
2015
 
2014
Alliant Energy
 
 
 
 
 
 
 
 
 
 
 
ATC (a)
16%
 

$317.6

 

$293.3

 

($39.1
)
 

($34.2
)
 

($41.9
)
Other
Various
 
8.4

 
9.6

 
(0.5
)
 
0.4

 
1.5

 
 
 

$326.0

 

$302.9

 

($39.6
)
 

($33.8
)
 

($40.4
)
WPL
 
 
 
 
 
 
 
 
 
 
 
ATC
—%
 

$—

 

$293.3

 

($39.1
)
 

($34.2
)
 

($41.9
)
Wisconsin River Power Company
50%
 
7.7

 
8.7

 
(0.7
)
 
(0.9
)
 
(0.9
)
 
 
 

$7.7

 

$302.0

 

($39.8
)
 

($35.1
)
 

($42.8
)

(a)
Alliant Energy currently has the ability to exercise significant influence over ATC’s financial and operating policies through its 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
 
2016
 
2015
 
2014
 
2016
 
2015
 
2014
Operating revenues

$658

 

$624

 

$643

 

$658

 

$624

 

$643

Operating income
331

 
299

 
330

 
331

 
299

 
330

Net income
232

 
186

 
240

 
234

 
202

 
240

As of December 31:
 
 
 
 
 
 
 
 
 
 
 
Current assets
82

 
88

 
 
 
6

 
87

 
 
Non-current assets
4,340

 
3,987

 
 
 
19

 
3,977

 
 
Current liabilities
498

 
332

 
 
 
3

 
332

 
 
Non-current liabilities
2,144

 
2,052

 
 
 
7

 
2,052

 
 
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
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Cash surrender value
$10.6
 
$42.3
 
$—
 
$18.9
 
$5.8
 
$6.4