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Investments (Tables)
 12 Months Ended
Dec. 31, 2017
Investment [Line Items]  
Unconsolidated Equity Investments
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, 2017
 
2017
 
2016
 
2017
 
2016
 
2015
Alliant Energy
 
 
 
 
 
 
 
 
 
 
 
ATC Investment (a)
16%-20%
 

$274.2

 

$317.6

 

($42.4
)
 

($39.1
)
 

($34.2
)
Wind Investment in Oklahoma
50%
 
98.3

 
—

 
(1.8
)
 
—

 
—

Other
Various
 
8.9

 
8.4

 
(0.6
)
 
(0.5
)
 
0.4

 
 
 

$381.4

 

$326.0

 

($44.8
)
 

($39.6
)
 

($33.8
)
WPL
 
 
 
 
 
 
 
 
 
 
 
ATC
—%
 

$—

 

$—

 

$—

 

($39.1
)
 

($34.2
)
Wisconsin River Power Company
50%
 
8.3

 
7.7

 
(0.7
)
 
(0.7
)
 
(0.9
)
 
 
 

$8.3

 

$7.7

 

($0.7
)
 

($39.8
)
 

($35.1
)

(a)
As of December 31, 2017, Alliant Energy’s ATC Investment is comprised of a 16% ownership interest in ATC and a 20% ownership interest in ATC Holdco LLC, which are described below. In 2017, Alliant Energy’s investment in ATC decreased due to the impacts of Tax Reform. Refer to Note 11 for further discussion. 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 Aggregate Financial Information
Summary aggregate financial information from the financial statements of these investments is as follows (in millions):
 
Alliant Energy
 
WPL
 
2017
 
2016
 
2015
 
2017
 
2016
 
2015
Operating revenues

$741

 

$658

 

$624

 

$8

 

$658

 

$624

Operating income
374

 
331

 
299

 
4

 
331

 
299

Net income
267

 
232

 
186

 
2

 
234

 
202

As of December 31:
 
 
 
 
 
 
 
 
 
 
 
Current assets
104

 
82

 
 
 
7

 
6

 
 
Non-current assets
5,041

 
4,340

 
 
 
20

 
19

 
 
Current liabilities
770

 
498

 
 
 
2

 
3

 
 
Non-current liabilities
2,038

 
2,144

 
 
 
8

 
7

 
 
Minority interest
255

 
—

 
 
 
—

 
—

 
 
Cash Surrender Value of Life Insurance Policies
At December 31, the cash surrender value of these investments was as follows (in millions):
 
Alliant Energy
 
WPL
 
2017
 
2016
 
2017
 
2016
Cash surrender value
$10.4
 
$10.6
 
$5.6
 
$5.8
WPL [Member]  
Investment [Line Items]  
Unconsolidated Equity Investments
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, 2017
 
2017
 
2016
 
2017
 
2016
 
2015
Alliant Energy
 
 
 
 
 
 
 
 
 
 
 
ATC Investment (a)
16%-20%
 

$274.2

 

$317.6

 

($42.4
)
 

($39.1
)
 

($34.2
)
Wind Investment in Oklahoma
50%
 
98.3

 
—

 
(1.8
)
 
—

 
—

Other
Various
 
8.9

 
8.4

 
(0.6
)
 
(0.5
)
 
0.4

 
 
 

$381.4

 

$326.0

 

($44.8
)
 

($39.6
)
 

($33.8
)
WPL
 
 
 
 
 
 
 
 
 
 
 
ATC
—%
 

$—

 

$—

 

$—

 

($39.1
)
 

($34.2
)
Wisconsin River Power Company
50%
 
8.3

 
7.7

 
(0.7
)
 
(0.7
)
 
(0.9
)
 
 
 

$8.3

 

$7.7

 

($0.7
)
 

($39.8
)
 

($35.1
)

(a)
As of December 31, 2017, Alliant Energy’s ATC Investment is comprised of a 16% ownership interest in ATC and a 20% ownership interest in ATC Holdco LLC, which are described below. In 2017, Alliant Energy’s investment in ATC decreased due to the impacts of Tax Reform. Refer to Note 11 for further discussion. 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 Aggregate Financial Information
Summary aggregate financial information from the financial statements of these investments is as follows (in millions):
 
Alliant Energy
 
WPL
 
2017
 
2016
 
2015
 
2017
 
2016
 
2015
Operating revenues

$741

 

$658

 

$624

 

$8

 

$658

 

$624

Operating income
374

 
331

 
299

 
4

 
331

 
299

Net income
267

 
232

 
186

 
2

 
234

 
202

As of December 31:
 
 
 
 
 
 
 
 
 
 
 
Current assets
104

 
82

 
 
 
7

 
6

 
 
Non-current assets
5,041

 
4,340

 
 
 
20

 
19

 
 
Current liabilities
770

 
498

 
 
 
2

 
3

 
 
Non-current liabilities
2,038

 
2,144

 
 
 
8

 
7

 
 
Minority interest
255

 
—

 
 
 
—

 
—

 
 
Cash Surrender Value of Life Insurance Policies
At December 31, the cash surrender value of these investments was as follows (in millions):
 
Alliant Energy
 
WPL
 
2017
 
2016
 
2017
 
2016
Cash surrender value
$10.4
 
$10.6
 
$5.6
 
$5.8