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Derivative Instruments (Tables)
 3 Months Ended
Mar. 31, 2013
Derivative [Line Items]  
Notional Amounts Of Derivative Instruments
As of March 31, 2013, notional amounts by delivery year related to outstanding swap contracts, option contracts, physical forward contracts, FTRs and coal contracts that were accounted for as commodity derivative instruments were as follows (units in thousands):
 
2013
 
2014
 
2015
 
2016
 
Total
Alliant Energy
 
 
 
 
 
 
 
 
 
Electricity (megawatt-hours (MWhs))
3,431

 
3,164

 
876

 
—

 
7,471

FTRs (MWs)
11

 
—

 
—

 
—

 
11

Natural gas (dekatherms (Dths))
66,884

 
10,130

 
1,880

 
455

 
79,349

Coal (tons)
672

 
981

 
562

 
—

 
2,215

IPL
 
 
 
 
 
 
 
 
 
Electricity (MWhs)
1,987

 
1,024

 
—

 
—

 
3,011

FTRs (MWs)
6

 
—

 
—

 
—

 
6

Natural gas (Dths)
52,116

 
5,765

 
1,430

 
455

 
59,766

WPL
 
 
 
 
 
 
 
 
 
Electricity (MWhs)
1,444

 
2,140

 
876

 
—

 
4,460

FTRs (MWs)
5

 
—

 
—

 
—

 
5

Natural gas (Dths)
14,768

 
4,365

 
450

 
—

 
19,583

Coal (tons)
672

 
981

 
562

 
—

 
2,215
Fair Value Of Financial Instruments
The fair values of current derivative assets were included in “Other current assets,” non-current derivative assets were included in “Deferred charges and other,” current derivative liabilities were included in “Other current liabilities” and non-current derivative liabilities were included in “Other long-term liabilities and deferred credits” on the Condensed Consolidated Balance Sheets as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
Commodity contracts
March 31,
2013
 
December 31,
2012
 
March 31,
2013
 
December 31,
2012
 
March 31,
2013
 
December 31,
2012
Current derivative assets

$17.5

 

$23.5

 

$10.9

 

$17.0

 

$6.6

 

$6.5

Non-current derivative assets
6.1

 
2.7

 
1.6

 
0.5

 
4.5

 
2.2

Current derivative liabilities
13.5

 
31.1

 
5.7

 
14.1

 
7.8

 
17.0

Non-current derivative liabilities
3.6

 
9.3

 
0.4

 
2.0

 
3.2

 
7.3
Gains And Losses From Derivative Instruments Not Designated As Hedging Instruments
Changes in unrealized gains (losses) from commodity derivative instruments not designated as hedging instruments were recorded with offsets to regulatory assets or regulatory liabilities on the Condensed Consolidated Balance Sheets as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Three Months Ended March 31
 
 
 
 
 
 
 
 
 
 
 
Regulatory assets

$9.5

 

($39.7
)
 

$2.7

 

($22.2
)
 

$6.8

 

($17.5
)
Regulatory liabilities
16.4

 
1.4

 
8.8

 
—

 
7.6

 
1.4
Balance Sheet Offsetting
Alliant Energy, IPL and WPL do not net derivative instruments subject to a master netting arrangement by counterparty on the Condensed Consolidated Balance Sheets. Alliant Energy, IPL and WPL also do not offset fair value amounts recognized for the right to reclaim cash collateral (receivable) or the obligation to return cash collateral (payable) against fair value amounts recognized for derivative instruments executed with the same counterparty under the same master netting arrangement. However, if Alliant Energy, IPL and WPL did net derivative instruments and related cash collateral by counterparty, derivative assets and derivative liabilities related to commodity contracts would have been presented on their Condensed Consolidated Balance Sheets as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
 
Gross
 
 
 
Gross
 
 
 
Gross
 
 
 
(as reported)
 
Net
 
(as reported)
 
Net
 
(as reported)
 
Net
March 31, 2013
 
 
 
 
 
 
 
 
 
 
 
Derivative assets

$23.6

 

$16.3

 

$12.5

 

$9.0

 

$11.1

 

$7.3

Derivative liabilities
17.1

 
9.8

 
6.1

 
2.6

 
11.0

 
7.2

December 31, 2012
 
 
 
 
 
 
 
 
 
 
 
Derivative assets
26.2

 
19.3

 
17.5

 
14.5

 
8.7

 
4.8

Derivative liabilities
40.4

 
33.0

 
16.1

 
12.6

 
24.3

 
20.4
IPL [Member]
  
Derivative [Line Items]  
Notional Amounts Of Derivative Instruments
As of March 31, 2013, notional amounts by delivery year related to outstanding swap contracts, option contracts, physical forward contracts, FTRs and coal contracts that were accounted for as commodity derivative instruments were as follows (units in thousands):
 
2013
 
2014
 
2015
 
2016
 
Total
Alliant Energy
 
 
 
 
 
 
 
 
 
Electricity (megawatt-hours (MWhs))
3,431

 
3,164

 
876

 
—

 
7,471

FTRs (MWs)
11

 
—

 
—

 
—

 
11

Natural gas (dekatherms (Dths))
66,884

 
10,130

 
1,880

 
455

 
79,349

Coal (tons)
672

 
981

 
562

 
—

 
2,215

IPL
 
 
 
 
 
 
 
 
 
Electricity (MWhs)
1,987

 
1,024

 
—

 
—

 
3,011

FTRs (MWs)
6

 
—

 
—

 
—

 
6

Natural gas (Dths)
52,116

 
5,765

 
1,430

 
455

 
59,766

WPL
 
 
 
 
 
 
 
 
 
Electricity (MWhs)
1,444

 
2,140

 
876

 
—

 
4,460

FTRs (MWs)
5

 
—

 
—

 
—

 
5

Natural gas (Dths)
14,768

 
4,365

 
450

 
—

 
19,583

Coal (tons)
672

 
981

 
562

 
—

 
2,215
Fair Value Of Financial Instruments
The fair values of current derivative assets were included in “Other current assets,” non-current derivative assets were included in “Deferred charges and other,” current derivative liabilities were included in “Other current liabilities” and non-current derivative liabilities were included in “Other long-term liabilities and deferred credits” on the Condensed Consolidated Balance Sheets as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
Commodity contracts
March 31,
2013
 
December 31,
2012
 
March 31,
2013
 
December 31,
2012
 
March 31,
2013
 
December 31,
2012
Current derivative assets

$17.5

 

$23.5

 

$10.9

 

$17.0

 

$6.6

 

$6.5

Non-current derivative assets
6.1

 
2.7

 
1.6

 
0.5

 
4.5

 
2.2

Current derivative liabilities
13.5

 
31.1

 
5.7

 
14.1

 
7.8

 
17.0

Non-current derivative liabilities
3.6

 
9.3

 
0.4

 
2.0

 
3.2

 
7.3
Gains And Losses From Derivative Instruments Not Designated As Hedging Instruments
Changes in unrealized gains (losses) from commodity derivative instruments not designated as hedging instruments were recorded with offsets to regulatory assets or regulatory liabilities on the Condensed Consolidated Balance Sheets as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Three Months Ended March 31
 
 
 
 
 
 
 
 
 
 
 
Regulatory assets

$9.5

 

($39.7
)
 

$2.7

 

($22.2
)
 

$6.8

 

($17.5
)
Regulatory liabilities
16.4

 
1.4

 
8.8

 
—

 
7.6

 
1.4
Balance Sheet Offsetting
Alliant Energy, IPL and WPL do not net derivative instruments subject to a master netting arrangement by counterparty on the Condensed Consolidated Balance Sheets. Alliant Energy, IPL and WPL also do not offset fair value amounts recognized for the right to reclaim cash collateral (receivable) or the obligation to return cash collateral (payable) against fair value amounts recognized for derivative instruments executed with the same counterparty under the same master netting arrangement. However, if Alliant Energy, IPL and WPL did net derivative instruments and related cash collateral by counterparty, derivative assets and derivative liabilities related to commodity contracts would have been presented on their Condensed Consolidated Balance Sheets as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
 
Gross
 
 
 
Gross
 
 
 
Gross
 
 
 
(as reported)
 
Net
 
(as reported)
 
Net
 
(as reported)
 
Net
March 31, 2013
 
 
 
 
 
 
 
 
 
 
 
Derivative assets

$23.6

 

$16.3

 

$12.5

 

$9.0

 

$11.1

 

$7.3

Derivative liabilities
17.1

 
9.8

 
6.1

 
2.6

 
11.0

 
7.2

December 31, 2012
 
 
 
 
 
 
 
 
 
 
 
Derivative assets
26.2

 
19.3

 
17.5

 
14.5

 
8.7

 
4.8

Derivative liabilities
40.4

 
33.0

 
16.1

 
12.6

 
24.3

 
20.4
WPL [Member]
  
Derivative [Line Items]  
Notional Amounts Of Derivative Instruments
As of March 31, 2013, notional amounts by delivery year related to outstanding swap contracts, option contracts, physical forward contracts, FTRs and coal contracts that were accounted for as commodity derivative instruments were as follows (units in thousands):
 
2013
 
2014
 
2015
 
2016
 
Total
Alliant Energy
 
 
 
 
 
 
 
 
 
Electricity (megawatt-hours (MWhs))
3,431

 
3,164

 
876

 
—

 
7,471

FTRs (MWs)
11

 
—

 
—

 
—

 
11

Natural gas (dekatherms (Dths))
66,884

 
10,130

 
1,880

 
455

 
79,349

Coal (tons)
672

 
981

 
562

 
—

 
2,215

IPL
 
 
 
 
 
 
 
 
 
Electricity (MWhs)
1,987

 
1,024

 
—

 
—

 
3,011

FTRs (MWs)
6

 
—

 
—

 
—

 
6

Natural gas (Dths)
52,116

 
5,765

 
1,430

 
455

 
59,766

WPL
 
 
 
 
 
 
 
 
 
Electricity (MWhs)
1,444

 
2,140

 
876

 
—

 
4,460

FTRs (MWs)
5

 
—

 
—

 
—

 
5

Natural gas (Dths)
14,768

 
4,365

 
450

 
—

 
19,583

Coal (tons)
672

 
981

 
562

 
—

 
2,215
Fair Value Of Financial Instruments
The fair values of current derivative assets were included in “Other current assets,” non-current derivative assets were included in “Deferred charges and other,” current derivative liabilities were included in “Other current liabilities” and non-current derivative liabilities were included in “Other long-term liabilities and deferred credits” on the Condensed Consolidated Balance Sheets as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
Commodity contracts
March 31,
2013
 
December 31,
2012
 
March 31,
2013
 
December 31,
2012
 
March 31,
2013
 
December 31,
2012
Current derivative assets

$17.5

 

$23.5

 

$10.9

 

$17.0

 

$6.6

 

$6.5

Non-current derivative assets
6.1

 
2.7

 
1.6

 
0.5

 
4.5

 
2.2

Current derivative liabilities
13.5

 
31.1

 
5.7

 
14.1

 
7.8

 
17.0

Non-current derivative liabilities
3.6

 
9.3

 
0.4

 
2.0

 
3.2

 
7.3
Gains And Losses From Derivative Instruments Not Designated As Hedging Instruments
Changes in unrealized gains (losses) from commodity derivative instruments not designated as hedging instruments were recorded with offsets to regulatory assets or regulatory liabilities on the Condensed Consolidated Balance Sheets as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Three Months Ended March 31
 
 
 
 
 
 
 
 
 
 
 
Regulatory assets

$9.5

 

($39.7
)
 

$2.7

 

($22.2
)
 

$6.8

 

($17.5
)
Regulatory liabilities
16.4

 
1.4

 
8.8

 
—

 
7.6

 
1.4
Balance Sheet Offsetting
Alliant Energy, IPL and WPL do not net derivative instruments subject to a master netting arrangement by counterparty on the Condensed Consolidated Balance Sheets. Alliant Energy, IPL and WPL also do not offset fair value amounts recognized for the right to reclaim cash collateral (receivable) or the obligation to return cash collateral (payable) against fair value amounts recognized for derivative instruments executed with the same counterparty under the same master netting arrangement. However, if Alliant Energy, IPL and WPL did net derivative instruments and related cash collateral by counterparty, derivative assets and derivative liabilities related to commodity contracts would have been presented on their Condensed Consolidated Balance Sheets as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
 
Gross
 
 
 
Gross
 
 
 
Gross
 
 
 
(as reported)
 
Net
 
(as reported)
 
Net
 
(as reported)
 
Net
March 31, 2013
 
 
 
 
 
 
 
 
 
 
 
Derivative assets

$23.6

 

$16.3

 

$12.5

 

$9.0

 

$11.1

 

$7.3

Derivative liabilities
17.1

 
9.8

 
6.1

 
2.6

 
11.0

 
7.2

December 31, 2012
 
 
 
 
 
 
 
 
 
 
 
Derivative assets
26.2

 
19.3

 
17.5

 
14.5

 
8.7

 
4.8

Derivative liabilities
40.4

 
33.0

 
16.1

 
12.6

 
24.3

 
20.4