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Redeemable Preferred Stock (Tables)
 12 Months Ended
Dec. 31, 2012
Class of Stock [Line Items]  
Schedule of Carrying Value Of Cumulative Preferred Stock
Information related to the carrying value of cumulative preferred stock of subsidiaries, net at December 31 was as follows (dollars in millions):
Liquidation Preference/ Stated Value
 
Authorized Shares
 
Shares Outstanding
 
Series
 
Redemption (none are mandatorily redeemable)
 
2012
 
2011
IPL:
 
 
 
 
 
 
 
 
 
 
 
 
$25
 
16,000,000
 
6,000,000
 
8.375%
 
On or after March 15, 2013
 

$150.0

 

$150.0

Less: discount
 
 
 
 
 
 
 
 
 
(4.9
)
 
(4.9
)
 
 
 
 
 
 
 
 
 
 
145.1

 
145.1

WPL:
 
 
 
 
 
 
 
 
 
 
 
 
$100
 
(a)
 
99,970
 
4.50%
 
Any time
 
10.0

 
10.0

$100
 
(a)
 
74,912
 
4.80%
 
Any time
 
7.5

 
7.5

$100
 
(a)
 
64,979
 
4.96%
 
Any time
 
6.5

 
6.5

$100
 
(a)
 
29,957
 
4.40%
 
Any time
 
3.0

 
3.0

$100
 
(a)
 
29,947
 
4.76%
 
Any time
 
3.0

 
3.0

$100
 
(a)
 
150,000
 
6.20%
 
Any time
 
15.0

 
15.0

$25
 
(a)
 
599,460
 
6.50%
 
Any time
 
15.0

 
15.0

 
 
 
 
 
 
 
 
 
 
60.0

 
60.0

Alliant Energy
 
 
 
 
 
 
 
 
 

$205.1

 

$205.1


(a)
WPL has 3,750,000 authorized shares in total.
IPL [Member]
  
Class of Stock [Line Items]  
Schedule of Carrying Value Of Cumulative Preferred Stock
Information related to the carrying value of cumulative preferred stock of subsidiaries, net at December 31 was as follows (dollars in millions):
Liquidation Preference/ Stated Value
 
Authorized Shares
 
Shares Outstanding
 
Series
 
Redemption (none are mandatorily redeemable)
 
2012
 
2011
IPL:
 
 
 
 
 
 
 
 
 
 
 
 
$25
 
16,000,000
 
6,000,000
 
8.375%
 
On or after March 15, 2013
 

$150.0

 

$150.0

Less: discount
 
 
 
 
 
 
 
 
 
(4.9
)
 
(4.9
)
 
 
 
 
 
 
 
 
 
 
145.1

 
145.1

WPL:
 
 
 
 
 
 
 
 
 
 
 
 
$100
 
(a)
 
99,970
 
4.50%
 
Any time
 
10.0

 
10.0

$100
 
(a)
 
74,912
 
4.80%
 
Any time
 
7.5

 
7.5

$100
 
(a)
 
64,979
 
4.96%
 
Any time
 
6.5

 
6.5

$100
 
(a)
 
29,957
 
4.40%
 
Any time
 
3.0

 
3.0

$100
 
(a)
 
29,947
 
4.76%
 
Any time
 
3.0

 
3.0

$100
 
(a)
 
150,000
 
6.20%
 
Any time
 
15.0

 
15.0

$25
 
(a)
 
599,460
 
6.50%
 
Any time
 
15.0

 
15.0

 
 
 
 
 
 
 
 
 
 
60.0

 
60.0

Alliant Energy
 
 
 
 
 
 
 
 
 

$205.1

 

$205.1


(a)
WPL has 3,750,000 authorized shares in total.
WPL [Member]
  
Class of Stock [Line Items]  
Schedule of Carrying Value Of Cumulative Preferred Stock
Information related to the carrying value of cumulative preferred stock of subsidiaries, net at December 31 was as follows (dollars in millions):
Liquidation Preference/ Stated Value
 
Authorized Shares
 
Shares Outstanding
 
Series
 
Redemption (none are mandatorily redeemable)
 
2012
 
2011
IPL:
 
 
 
 
 
 
 
 
 
 
 
 
$25
 
16,000,000
 
6,000,000
 
8.375%
 
On or after March 15, 2013
 

$150.0

 

$150.0

Less: discount
 
 
 
 
 
 
 
 
 
(4.9
)
 
(4.9
)
 
 
 
 
 
 
 
 
 
 
145.1

 
145.1

WPL:
 
 
 
 
 
 
 
 
 
 
 
 
$100
 
(a)
 
99,970
 
4.50%
 
Any time
 
10.0

 
10.0

$100
 
(a)
 
74,912
 
4.80%
 
Any time
 
7.5

 
7.5

$100
 
(a)
 
64,979
 
4.96%
 
Any time
 
6.5

 
6.5

$100
 
(a)
 
29,957
 
4.40%
 
Any time
 
3.0

 
3.0

$100
 
(a)
 
29,947
 
4.76%
 
Any time
 
3.0

 
3.0

$100
 
(a)
 
150,000
 
6.20%
 
Any time
 
15.0

 
15.0

$25
 
(a)
 
599,460
 
6.50%
 
Any time
 
15.0

 
15.0

 
 
 
 
 
 
 
 
 
 
60.0

 
60.0

Alliant Energy
 
 
 
 
 
 
 
 
 

$205.1

 

$205.1


(a)
WPL has 3,750,000 authorized shares in total.