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Segments Of Business (Tables)
 9 Months Ended
Sep. 30, 2013
Segment Reporting Information [Line Items]  
Schedule Of Segments Of Business
Certain financial information relating to Alliant Energy’s business segments is as follows. Intersegment revenues were not material to Alliant Energy’s operations.
 
Utility
 
Non-Regulated,
 
Alliant Energy
 
Electric
 
Gas
 
Other
 
Total
 
Parent and Other
 
Consolidated
 
(in millions)
Three Months Ended September 30, 2013
 
 
 
 
 
 
 
 
 
 
 
Operating revenues

$798.1

 

$39.8

 

$17.4

 

$855.3

 

$11.3

 

$866.6

Operating income (loss)
199.6

 
(3.4
)
 
(0.3
)
 
195.9

 
5.5

 
201.4

Amounts attributable to Alliant Energy common shareowners:
 
 
 
 
 
 
 
 
 
 
 
Income (loss) from continuing operations, net of tax
 
 
 
 
 
 
171.3

 
(12.4
)
 
158.9

Loss from discontinued operations, net of tax
 
 
 
 
 
 
—

 
(1.3
)
 
(1.3
)
Net income (loss) attributable to Alliant Energy common shareowners
 
 
 
 
 
 
171.3

 
(13.7
)
 
157.6

Three Months Ended September 30, 2012
 
 
 
 
 
 
 
 
 
 
 
Operating revenues

$815.3

 

$46.8

 

$12.2

 

$874.3

 

$13.3

 

$887.6

Operating income
203.1

 
0.8

 
1.5

 
205.4

 
8.3

 
213.7

Amounts attributable to Alliant Energy common shareowners:
 
 
 
 
 
 
 
 
 
 
 
Income (loss) from continuing operations, net of tax
 
 
 
 
 
 
159.2

 
(10.2
)
 
149.0

Income from discontinued operations, net of tax
 
 
 
 
 
 
—

 
1.7

 
1.7

Net income (loss) attributable to Alliant Energy common shareowners
 
 
 
 
 
 
159.2

 
(8.5
)
 
150.7

 
Utility
 
Non-Regulated,
 
Alliant Energy
 
Electric
 
Gas
 
Other
 
Total
 
Parent and Other
 
Consolidated
 
(in millions)
Nine Months Ended September 30, 2013
 
 
 
 
 
 
 
 
 
 
 
Operating revenues

$2,043.4

 

$310.5

 

$52.4

 

$2,406.3

 

$37.9

 

$2,444.2

Operating income
359.1

 
39.5

 
5.5

 
404.1

 
21.2

 
425.3

Amounts attributable to Alliant Energy common shareowners:
 
 
 
 
 
 
 
 
 
 
 
Income from continuing operations, net of tax
 
 
 
 
 
 
292.8

 
4.9

 
297.7

Loss from discontinued operations, net of tax
 
 
 
 
 
 
—

 
(4.9
)
 
(4.9
)
Net income attributable to Alliant Energy common shareowners
 
 
 
 
 
 
292.8

 
—

 
292.8

Nine Months Ended September 30, 2012
 
 
 
 
 
 
 
 
 
 
 
Operating revenues

$2,000.3

 

$263.9

 

$39.7

 

$2,303.9

 

$39.7

 

$2,343.6

Operating income
354.0

 
32.1

 
4.7

 
390.8

 
27.3

 
418.1

Amounts attributable to Alliant Energy common shareowners:
 
 
 
 
 
 
 
 
 
 
 
Income from continuing operations, net of tax
 
 
 
 
 
 
237.4

 
16.4

 
253.8

Loss from discontinued operations, net of tax
 
 
 
 
 
 
—

 
(2.3
)
 
(2.3
)
Net income attributable to Alliant Energy common shareowners
 
 
 
 
 
 
237.4

 
14.1

 
251.5
IPL [Member]
  
Segment Reporting Information [Line Items]  
Schedule Of Segments Of Business
Certain financial information relating to IPL’s business segments is as follows. Intersegment revenues were not material to IPL’s operations.
 
Electric
 
Gas
 
Other
 
Total
 
(in millions)
Three Months Ended September 30, 2013
 
 
 
 
 
 
 
Operating revenues

$457.6

 

$24.6

 

$12.2

 

$494.4

Operating income (loss)
99.6

 
(0.7
)
 
1.1

 
100.0

Earnings available for common stock
 
 
 
 
 
 
110.0

Three Months Ended September 30, 2012
 
 
 
 
 
 
 
Operating revenues

$456.6

 

$29.6

 

$11.5

 

$497.7

Operating income
109.5

 
0.6

 
1.9

 
112.0

Earnings available for common stock
 
 
 
 
 
 
103.3

Nine Months Ended September 30, 2013
 
 
 
 
 
 
 
Operating revenues

$1,137.4

 

$180.9

 

$37.4

 

$1,355.7

Operating income
146.2

 
22.6

 
7.0

 
175.8

Earnings available for common stock
 
 
 
 
 
 
155.1

Nine Months Ended September 30, 2012
 
 
 
 
 
 
 
Operating revenues

$1,070.7

 

$149.2

 

$37.2

 

$1,257.1

Operating income
149.3

 
15.6

 
6.4

 
171.3

Earnings available for common stock
 
 
 
 
 
 
115.2
WPL [Member]
  
Segment Reporting Information [Line Items]  
Schedule Of Segments Of Business
Certain financial information relating to WPL’s business segments is as follows. Intersegment revenues were not material to WPL’s operations.
 
Electric
 
Gas
 
Other
 
Total
 
(in millions)
Three Months Ended September 30, 2013
 
 
 
 
 
 
 
Operating revenues

$340.5

 

$15.2

 

$5.2

 

$360.9

Operating income (loss)
100.0

 
(2.7
)
 
(1.4
)
 
95.9

Earnings available for common stock
 
 
 
 
 
 
61.3

Three Months Ended September 30, 2012
 
 
 
 
 
 
 
Operating revenues

$358.7

 

$17.2

 

$0.7

 

$376.6

Operating income (loss)
93.6

 
0.2

 
(0.4
)
 
93.4

Earnings available for common stock
 
 
 
 
 
 
55.9

Nine Months Ended September 30, 2013
 
 
 
 
 
 
 
Operating revenues

$906.0

 

$129.6

 

$15.0

 

$1,050.6

Operating income (loss)
212.9

 
16.9

 
(1.5
)
 
228.3

Earnings available for common stock
 
 
 
 
 
 
137.7

Nine Months Ended September 30, 2012
 
 
 
 
 
 
 
Operating revenues

$929.6

 

$114.7

 

$2.5

 

$1,046.8

Operating income (loss)
204.7

 
16.5

 
(1.7
)
 
219.5

Earnings available for common stock
 
 
 
 
 
 
122.2