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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2015
Statement [Line Items]  
Carrying Amount and Fair Value Of Financial Instruments
Carrying amounts and the related estimated fair values of other financial instruments were as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
June 30, 2015
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
Assets:
 
 
 
 
 
 
 
 
 
 
 
Derivative assets (Note 12)

$35.0

 

$35.0

 

$30.7

 

$30.7

 

$4.3

 

$4.3

Deferred proceeds (sales of receivables) (Note 4(a))
73.4

 
73.4

 
73.4

 
73.4

 
—

 
—

Capitalization and liabilities:
 
 
 
 
 
 
 
 
 
 
 
Long-term debt (including current maturities) (Note 7(b))
3,750.9

 
4,214.4

 
1,730.2

 
1,937.2

 
1,574.1

 
1,824.0

Cumulative preferred stock
200.0

 
198.9

 
200.0

 
198.9

 
—

 
—

Derivative liabilities (Note 12)
47.0

 
47.0

 
20.7

 
20.7

 
26.3

 
26.3

 
Alliant Energy
 
IPL
 
WPL
December 31, 2014
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
Assets:
 
 
 
 
 
 
 
 
 
 
 
Derivative assets (Note 12)

$38.6

 

$38.6

 

$28.0

 

$28.0

 

$10.6

 

$10.6

Deferred proceeds (sales of receivables) (Note 4(a))
177.2

 
177.2

 
177.2

 
177.2

 
—

 
—

Capitalization and liabilities:
 
 
 
 
 
 
 
 
 
 
 
Long-term debt (including current maturities) (Note 7(b))
3,789.7

 
4,418.2

 
1,768.7

 
2,053.0

 
1,573.9

 
1,908.9

Cumulative preferred stock
200.0

 
200.2

 
200.0

 
200.2

 
—

 
—

Derivative liabilities (Note 12)
37.6

 
37.6

 
19.5

 
19.5

 
18.1

 
18.1
Fair Value Measurements
Items subject to fair value measurement disclosure requirements were as follows (in millions):
Alliant Energy
June 30, 2015
 
December 31, 2014
 
Fair
 
Level
 
Level
 
Level
 
Fair
 
Level
 
Level
 
Level
 
Value
 
1
 
2
 
3
 
Value
 
1
 
2
 
3
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Derivatives - commodity contracts

$35.0

 

$—

 

$3.0

 

$32.0

 

$38.6

 

$—

 

$2.6

 

$36.0

Deferred proceeds
73.4

 
—

 
—

 
73.4

 
177.2

 
—

 
—

 
177.2

Capitalization and liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Long-term debt (including current maturities)
4,214.4

 
—

 
4,210.7

 
3.7

 
4,418.2

 
—

 
4,414.9

 
3.3

Cumulative preferred stock
198.9

 
198.9

 
—

 
—

 
200.2

 
200.2

 
—

 
—

Derivatives - commodity contracts
47.0

 
—

 
15.6

 
31.4

 
37.6

 
—

 
19.5

 
18.1

IPL
June 30, 2015
 
December 31, 2014
 
Fair
 
Level
 
Level
 
Level
 
Fair
 
Level
 
Level
 
Level
 
Value
 
1
 
2
 
3
 
Value
 
1
 
2
 
3
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Derivatives - commodity contracts

$30.7

 

$—

 

$1.9

 

$28.8

 

$28.0

 

$—

 

$2.4

 

$25.6

Deferred proceeds
73.4

 
—

 
—

 
73.4

 
177.2

 
—

 
—

 
177.2

Capitalization and liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Long-term debt (including current maturities)
1,937.2

 
—

 
1,937.2

 
—

 
2,053.0

 
—

 
2,053.0

 
—

Cumulative preferred stock
198.9

 
198.9

 
—

 
—

 
200.2

 
200.2

 
—

 
—

Derivatives - commodity contracts
20.7

 
—

 
10.2

 
10.5

 
19.5

 
—

 
13.3

 
6.2

WPL
June 30, 2015
 
December 31, 2014
 
Fair
 
Level
 
Level
 
Level
 
Fair
 
Level
 
Level
 
Level
 
Value
 
1
 
2
 
3
 
Value
 
1
 
2
 
3
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Derivatives - commodity contracts

$4.3

 

$—

 

$1.1

 

$3.2

 

$10.6

 

$—

 

$0.2

 

$10.4

Capitalization and liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Long-term debt (including current maturities)
1,824.0

 
—

 
1,824.0

 
—

 
1,908.9

 
—

 
1,908.9

 
—

Derivatives - commodity contracts
26.3

 
—

 
5.4

 
20.9

 
18.1

 
—

 
6.2

 
11.9
Fair Value Measurements Using Significant Unobservable Inputs
Information for fair value measurements using significant unobservable inputs (Level 3 inputs) was as follows (in millions):
Alliant Energy
Commodity Contract Derivative
 
 
 
Assets and (Liabilities), net
 
Deferred Proceeds
Three Months Ended June 30
2015
 
2014
 
2015
 
2014
Beginning balance, April 1

($13.1
)
 

$23.9

 

$117.7

 

$170.8

Total net gains (losses) (realized/unrealized) included in changes in net assets
(19.6
)
 
16.9

 
—

 
—

Transfers out of Level 3
1.0

 
—

 
—

 
—

Purchases
36.8

 
76.7

 
—

 
—

Sales
(0.4
)
 
—

 
—

 
—

Settlements (a)
(4.1
)
 
(16.3
)
 
(44.3
)
 
22.9

Ending balance, June 30

$0.6

 

$101.2

 

$73.4

 

$193.7

The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30

($17.7
)
 

$16.3

 

$—

 

$—

Alliant Energy
Commodity Contract Derivative
 
 
 
Assets and (Liabilities), net
 
Deferred Proceeds
Six Months Ended June 30
2015
 
2014
 
2015
 
2014
Beginning balance, January 1

$17.9

 

$4.4

 

$177.2

 

$203.5

Total net gains (losses) (realized/unrealized) included in changes in net assets
(36.8
)
 
54.7

 
—

 
—

Transfers out of Level 3
0.6

 
—

 
—

 
—

Purchases
36.8

 
76.7

 
—

 
—

Sales
(1.2
)
 
—

 
—

 
—

Settlements (a)
(16.7
)
 
(34.6
)
 
(103.8
)
 
(9.8
)
Ending balance, June 30

$0.6

 

$101.2

 

$73.4

 

$193.7

The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30

($33.9
)
 

$46.0

 

$—

 

$—

IPL
Commodity Contract Derivative
 
 
 
Assets and (Liabilities), net
 
Deferred Proceeds
Three Months Ended June 30
2015
 
2014
 
2015
 
2014
Beginning balance, April 1

($5.0
)
 

$7.8

 

$117.7

 

$170.8

Total net gains (losses) (realized/unrealized) included in changes in net assets
(5.0
)
 
0.6

 
—

 
—

Transfers out of Level 3
0.2

 
—

 
—

 
—

Purchases
33.1

 
68.8

 
—

 
—

Sales
(0.4
)
 
—

 
—

 
—

Settlements (a)
(4.6
)
 
(13.0
)
 
(44.3
)
 
22.9

Ending balance, June 30

$18.3

 

$64.2

 

$73.4

 

$193.7

The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30

($4.2
)
 

$0.7

 

$—

 

$—

IPL
Commodity Contract Derivative
 
 
 
Assets and (Liabilities), net
 
Deferred Proceeds
Six Months Ended June 30
2015
 
2014
 
2015
 
2014
Beginning balance, January 1

$19.4

 

$14.6

 

$177.2

 

$203.5

Total net gains (losses) (realized/unrealized) included in changes in net assets
(17.4
)
 
4.4

 
—

 
—

Purchases
33.1

 
68.8

 
—

 
—

Sales
(1.1
)
 
—

 
—

 
—

Settlements (a)
(15.7
)
 
(23.6
)
 
(103.8
)
 
(9.8
)
Ending balance, June 30

$18.3

 

$64.2

 

$73.4

 

$193.7

The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30

($14.3
)
 

$3.7

 

$—

 

$—

WPL
Commodity Contract Derivative
 
Assets and (Liabilities), net
Three Months Ended June 30
2015
 
2014
Beginning balance, April 1

($8.1
)
 

$16.1

Total net gains (losses) (realized/unrealized) included in changes in net assets
(14.6
)
 
16.3

Transfers out of Level 3
0.8

 
—

Purchases
3.7

 
7.9

Settlements
0.5

 
(3.3
)
Ending balance, June 30

($17.7
)
 

$37.0

The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30

($13.5
)
 

$15.6


WPL
Commodity Contract Derivative
 
Assets and (Liabilities), net
Six Months Ended June 30
2015
 
2014
Beginning balance, January 1

($1.5
)
 

($10.2
)
Total net gains (losses) (realized/unrealized) included in changes in net assets
(19.4
)
 
50.3

Transfers out of Level 3
0.6

 
—

Purchases
3.7

 
7.9

Sales
(0.1
)
 
—

Settlements
(1.0
)
 
(11.0
)
Ending balance, June 30

($17.7
)
 

$37.0

The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30

($19.6
)
 

$42.3



(a)
Settlements related to deferred proceeds are due to the change in the carrying amount of receivables sold less the allowance for doubtful accounts associated with the receivables sold and cash proceeds received from the receivables sold.
Fair Value Of Net Derivative Assets (Liabilities)
The fair value of electric, natural gas and coal commodity contracts categorized as Level 3 was recognized as net derivative assets (liabilities) as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
 
Excluding FTRs
 
FTRs
 
Excluding FTRs
 
FTRs
 
Excluding FTRs
 
FTRs
June 30, 2015

($28.3
)
 

$28.9

 

($9.0
)
 

$27.3

 

($19.3
)
 

$1.6

December 31, 2014
(7.0
)
 
24.9

 
(3.2
)
 
22.6

 
(3.8
)
 
2.3
IPL [Member]  
Statement [Line Items]  
Carrying Amount and Fair Value Of Financial Instruments
Carrying amounts and the related estimated fair values of other financial instruments were as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
June 30, 2015
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
Assets:
 
 
 
 
 
 
 
 
 
 
 
Derivative assets (Note 12)

$35.0

 

$35.0

 

$30.7

 

$30.7

 

$4.3

 

$4.3

Deferred proceeds (sales of receivables) (Note 4(a))
73.4

 
73.4

 
73.4

 
73.4

 
—

 
—

Capitalization and liabilities:
 
 
 
 
 
 
 
 
 
 
 
Long-term debt (including current maturities) (Note 7(b))
3,750.9

 
4,214.4

 
1,730.2

 
1,937.2

 
1,574.1

 
1,824.0

Cumulative preferred stock
200.0

 
198.9

 
200.0

 
198.9

 
—

 
—

Derivative liabilities (Note 12)
47.0

 
47.0

 
20.7

 
20.7

 
26.3

 
26.3

 
Alliant Energy
 
IPL
 
WPL
December 31, 2014
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
Assets:
 
 
 
 
 
 
 
 
 
 
 
Derivative assets (Note 12)

$38.6

 

$38.6

 

$28.0

 

$28.0

 

$10.6

 

$10.6

Deferred proceeds (sales of receivables) (Note 4(a))
177.2

 
177.2

 
177.2

 
177.2

 
—

 
—

Capitalization and liabilities:
 
 
 
 
 
 
 
 
 
 
 
Long-term debt (including current maturities) (Note 7(b))
3,789.7

 
4,418.2

 
1,768.7

 
2,053.0

 
1,573.9

 
1,908.9

Cumulative preferred stock
200.0

 
200.2

 
200.0

 
200.2

 
—

 
—

Derivative liabilities (Note 12)
37.6

 
37.6

 
19.5

 
19.5

 
18.1

 
18.1
Fair Value Measurements
Items subject to fair value measurement disclosure requirements were as follows (in millions):
Alliant Energy
June 30, 2015
 
December 31, 2014
 
Fair
 
Level
 
Level
 
Level
 
Fair
 
Level
 
Level
 
Level
 
Value
 
1
 
2
 
3
 
Value
 
1
 
2
 
3
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Derivatives - commodity contracts

$35.0

 

$—

 

$3.0

 

$32.0

 

$38.6

 

$—

 

$2.6

 

$36.0

Deferred proceeds
73.4

 
—

 
—

 
73.4

 
177.2

 
—

 
—

 
177.2

Capitalization and liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Long-term debt (including current maturities)
4,214.4

 
—

 
4,210.7

 
3.7

 
4,418.2

 
—

 
4,414.9

 
3.3

Cumulative preferred stock
198.9

 
198.9

 
—

 
—

 
200.2

 
200.2

 
—

 
—

Derivatives - commodity contracts
47.0

 
—

 
15.6

 
31.4

 
37.6

 
—

 
19.5

 
18.1

IPL
June 30, 2015
 
December 31, 2014
 
Fair
 
Level
 
Level
 
Level
 
Fair
 
Level
 
Level
 
Level
 
Value
 
1
 
2
 
3
 
Value
 
1
 
2
 
3
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Derivatives - commodity contracts

$30.7

 

$—

 

$1.9

 

$28.8

 

$28.0

 

$—

 

$2.4

 

$25.6

Deferred proceeds
73.4

 
—

 
—

 
73.4

 
177.2

 
—

 
—

 
177.2

Capitalization and liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Long-term debt (including current maturities)
1,937.2

 
—

 
1,937.2

 
—

 
2,053.0

 
—

 
2,053.0

 
—

Cumulative preferred stock
198.9

 
198.9

 
—

 
—

 
200.2

 
200.2

 
—

 
—

Derivatives - commodity contracts
20.7

 
—

 
10.2

 
10.5

 
19.5

 
—

 
13.3

 
6.2

WPL
June 30, 2015
 
December 31, 2014
 
Fair
 
Level
 
Level
 
Level
 
Fair
 
Level
 
Level
 
Level
 
Value
 
1
 
2
 
3
 
Value
 
1
 
2
 
3
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Derivatives - commodity contracts

$4.3

 

$—

 

$1.1

 

$3.2

 

$10.6

 

$—

 

$0.2

 

$10.4

Capitalization and liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Long-term debt (including current maturities)
1,824.0

 
—

 
1,824.0

 
—

 
1,908.9

 
—

 
1,908.9

 
—

Derivatives - commodity contracts
26.3

 
—

 
5.4

 
20.9

 
18.1

 
—

 
6.2

 
11.9
Fair Value Measurements Using Significant Unobservable Inputs
Information for fair value measurements using significant unobservable inputs (Level 3 inputs) was as follows (in millions):
Alliant Energy
Commodity Contract Derivative
 
 
 
Assets and (Liabilities), net
 
Deferred Proceeds
Three Months Ended June 30
2015
 
2014
 
2015
 
2014
Beginning balance, April 1

($13.1
)
 

$23.9

 

$117.7

 

$170.8

Total net gains (losses) (realized/unrealized) included in changes in net assets
(19.6
)
 
16.9

 
—

 
—

Transfers out of Level 3
1.0

 
—

 
—

 
—

Purchases
36.8

 
76.7

 
—

 
—

Sales
(0.4
)
 
—

 
—

 
—

Settlements (a)
(4.1
)
 
(16.3
)
 
(44.3
)
 
22.9

Ending balance, June 30

$0.6

 

$101.2

 

$73.4

 

$193.7

The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30

($17.7
)
 

$16.3

 

$—

 

$—

Alliant Energy
Commodity Contract Derivative
 
 
 
Assets and (Liabilities), net
 
Deferred Proceeds
Six Months Ended June 30
2015
 
2014
 
2015
 
2014
Beginning balance, January 1

$17.9

 

$4.4

 

$177.2

 

$203.5

Total net gains (losses) (realized/unrealized) included in changes in net assets
(36.8
)
 
54.7

 
—

 
—

Transfers out of Level 3
0.6

 
—

 
—

 
—

Purchases
36.8

 
76.7

 
—

 
—

Sales
(1.2
)
 
—

 
—

 
—

Settlements (a)
(16.7
)
 
(34.6
)
 
(103.8
)
 
(9.8
)
Ending balance, June 30

$0.6

 

$101.2

 

$73.4

 

$193.7

The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30

($33.9
)
 

$46.0

 

$—

 

$—

IPL
Commodity Contract Derivative
 
 
 
Assets and (Liabilities), net
 
Deferred Proceeds
Three Months Ended June 30
2015
 
2014
 
2015
 
2014
Beginning balance, April 1

($5.0
)
 

$7.8

 

$117.7

 

$170.8

Total net gains (losses) (realized/unrealized) included in changes in net assets
(5.0
)
 
0.6

 
—

 
—

Transfers out of Level 3
0.2

 
—

 
—

 
—

Purchases
33.1

 
68.8

 
—

 
—

Sales
(0.4
)
 
—

 
—

 
—

Settlements (a)
(4.6
)
 
(13.0
)
 
(44.3
)
 
22.9

Ending balance, June 30

$18.3

 

$64.2

 

$73.4

 

$193.7

The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30

($4.2
)
 

$0.7

 

$—

 

$—

IPL
Commodity Contract Derivative
 
 
 
Assets and (Liabilities), net
 
Deferred Proceeds
Six Months Ended June 30
2015
 
2014
 
2015
 
2014
Beginning balance, January 1

$19.4

 

$14.6

 

$177.2

 

$203.5

Total net gains (losses) (realized/unrealized) included in changes in net assets
(17.4
)
 
4.4

 
—

 
—

Purchases
33.1

 
68.8

 
—

 
—

Sales
(1.1
)
 
—

 
—

 
—

Settlements (a)
(15.7
)
 
(23.6
)
 
(103.8
)
 
(9.8
)
Ending balance, June 30

$18.3

 

$64.2

 

$73.4

 

$193.7

The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30

($14.3
)
 

$3.7

 

$—

 

$—

WPL
Commodity Contract Derivative
 
Assets and (Liabilities), net
Three Months Ended June 30
2015
 
2014
Beginning balance, April 1

($8.1
)
 

$16.1

Total net gains (losses) (realized/unrealized) included in changes in net assets
(14.6
)
 
16.3

Transfers out of Level 3
0.8

 
—

Purchases
3.7

 
7.9

Settlements
0.5

 
(3.3
)
Ending balance, June 30

($17.7
)
 

$37.0

The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30

($13.5
)
 

$15.6


WPL
Commodity Contract Derivative
 
Assets and (Liabilities), net
Six Months Ended June 30
2015
 
2014
Beginning balance, January 1

($1.5
)
 

($10.2
)
Total net gains (losses) (realized/unrealized) included in changes in net assets
(19.4
)
 
50.3

Transfers out of Level 3
0.6

 
—

Purchases
3.7

 
7.9

Sales
(0.1
)
 
—

Settlements
(1.0
)
 
(11.0
)
Ending balance, June 30

($17.7
)
 

$37.0

The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30

($19.6
)
 

$42.3



(a)
Settlements related to deferred proceeds are due to the change in the carrying amount of receivables sold less the allowance for doubtful accounts associated with the receivables sold and cash proceeds received from the receivables sold.
Fair Value Of Net Derivative Assets (Liabilities)
The fair value of electric, natural gas and coal commodity contracts categorized as Level 3 was recognized as net derivative assets (liabilities) as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
 
Excluding FTRs
 
FTRs
 
Excluding FTRs
 
FTRs
 
Excluding FTRs
 
FTRs
June 30, 2015

($28.3
)
 

$28.9

 

($9.0
)
 

$27.3

 

($19.3
)
 

$1.6

December 31, 2014
(7.0
)
 
24.9

 
(3.2
)
 
22.6

 
(3.8
)
 
2.3
WPL [Member]  
Statement [Line Items]  
Carrying Amount and Fair Value Of Financial Instruments
Carrying amounts and the related estimated fair values of other financial instruments were as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
June 30, 2015
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
Assets:
 
 
 
 
 
 
 
 
 
 
 
Derivative assets (Note 12)

$35.0

 

$35.0

 

$30.7

 

$30.7

 

$4.3

 

$4.3

Deferred proceeds (sales of receivables) (Note 4(a))
73.4

 
73.4

 
73.4

 
73.4

 
—

 
—

Capitalization and liabilities:
 
 
 
 
 
 
 
 
 
 
 
Long-term debt (including current maturities) (Note 7(b))
3,750.9

 
4,214.4

 
1,730.2

 
1,937.2

 
1,574.1

 
1,824.0

Cumulative preferred stock
200.0

 
198.9

 
200.0

 
198.9

 
—

 
—

Derivative liabilities (Note 12)
47.0

 
47.0

 
20.7

 
20.7

 
26.3

 
26.3

 
Alliant Energy
 
IPL
 
WPL
December 31, 2014
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
Assets:
 
 
 
 
 
 
 
 
 
 
 
Derivative assets (Note 12)

$38.6

 

$38.6

 

$28.0

 

$28.0

 

$10.6

 

$10.6

Deferred proceeds (sales of receivables) (Note 4(a))
177.2

 
177.2

 
177.2

 
177.2

 
—

 
—

Capitalization and liabilities:
 
 
 
 
 
 
 
 
 
 
 
Long-term debt (including current maturities) (Note 7(b))
3,789.7

 
4,418.2

 
1,768.7

 
2,053.0

 
1,573.9

 
1,908.9

Cumulative preferred stock
200.0

 
200.2

 
200.0

 
200.2

 
—

 
—

Derivative liabilities (Note 12)
37.6

 
37.6

 
19.5

 
19.5

 
18.1

 
18.1
Fair Value Measurements
Items subject to fair value measurement disclosure requirements were as follows (in millions):
Alliant Energy
June 30, 2015
 
December 31, 2014
 
Fair
 
Level
 
Level
 
Level
 
Fair
 
Level
 
Level
 
Level
 
Value
 
1
 
2
 
3
 
Value
 
1
 
2
 
3
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Derivatives - commodity contracts

$35.0

 

$—

 

$3.0

 

$32.0

 

$38.6

 

$—

 

$2.6

 

$36.0

Deferred proceeds
73.4

 
—

 
—

 
73.4

 
177.2

 
—

 
—

 
177.2

Capitalization and liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Long-term debt (including current maturities)
4,214.4

 
—

 
4,210.7

 
3.7

 
4,418.2

 
—

 
4,414.9

 
3.3

Cumulative preferred stock
198.9

 
198.9

 
—

 
—

 
200.2

 
200.2

 
—

 
—

Derivatives - commodity contracts
47.0

 
—

 
15.6

 
31.4

 
37.6

 
—

 
19.5

 
18.1

IPL
June 30, 2015
 
December 31, 2014
 
Fair
 
Level
 
Level
 
Level
 
Fair
 
Level
 
Level
 
Level
 
Value
 
1
 
2
 
3
 
Value
 
1
 
2
 
3
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Derivatives - commodity contracts

$30.7

 

$—

 

$1.9

 

$28.8

 

$28.0

 

$—

 

$2.4

 

$25.6

Deferred proceeds
73.4

 
—

 
—

 
73.4

 
177.2

 
—

 
—

 
177.2

Capitalization and liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Long-term debt (including current maturities)
1,937.2

 
—

 
1,937.2

 
—

 
2,053.0

 
—

 
2,053.0

 
—

Cumulative preferred stock
198.9

 
198.9

 
—

 
—

 
200.2

 
200.2

 
—

 
—

Derivatives - commodity contracts
20.7

 
—

 
10.2

 
10.5

 
19.5

 
—

 
13.3

 
6.2

WPL
June 30, 2015
 
December 31, 2014
 
Fair
 
Level
 
Level
 
Level
 
Fair
 
Level
 
Level
 
Level
 
Value
 
1
 
2
 
3
 
Value
 
1
 
2
 
3
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Derivatives - commodity contracts

$4.3

 

$—

 

$1.1

 

$3.2

 

$10.6

 

$—

 

$0.2

 

$10.4

Capitalization and liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Long-term debt (including current maturities)
1,824.0

 
—

 
1,824.0

 
—

 
1,908.9

 
—

 
1,908.9

 
—

Derivatives - commodity contracts
26.3

 
—

 
5.4

 
20.9

 
18.1

 
—

 
6.2

 
11.9
Fair Value Measurements Using Significant Unobservable Inputs
Information for fair value measurements using significant unobservable inputs (Level 3 inputs) was as follows (in millions):
Alliant Energy
Commodity Contract Derivative
 
 
 
Assets and (Liabilities), net
 
Deferred Proceeds
Three Months Ended June 30
2015
 
2014
 
2015
 
2014
Beginning balance, April 1

($13.1
)
 

$23.9

 

$117.7

 

$170.8

Total net gains (losses) (realized/unrealized) included in changes in net assets
(19.6
)
 
16.9

 
—

 
—

Transfers out of Level 3
1.0

 
—

 
—

 
—

Purchases
36.8

 
76.7

 
—

 
—

Sales
(0.4
)
 
—

 
—

 
—

Settlements (a)
(4.1
)
 
(16.3
)
 
(44.3
)
 
22.9

Ending balance, June 30

$0.6

 

$101.2

 

$73.4

 

$193.7

The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30

($17.7
)
 

$16.3

 

$—

 

$—

Alliant Energy
Commodity Contract Derivative
 
 
 
Assets and (Liabilities), net
 
Deferred Proceeds
Six Months Ended June 30
2015
 
2014
 
2015
 
2014
Beginning balance, January 1

$17.9

 

$4.4

 

$177.2

 

$203.5

Total net gains (losses) (realized/unrealized) included in changes in net assets
(36.8
)
 
54.7

 
—

 
—

Transfers out of Level 3
0.6

 
—

 
—

 
—

Purchases
36.8

 
76.7

 
—

 
—

Sales
(1.2
)
 
—

 
—

 
—

Settlements (a)
(16.7
)
 
(34.6
)
 
(103.8
)
 
(9.8
)
Ending balance, June 30

$0.6

 

$101.2

 

$73.4

 

$193.7

The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30

($33.9
)
 

$46.0

 

$—

 

$—

IPL
Commodity Contract Derivative
 
 
 
Assets and (Liabilities), net
 
Deferred Proceeds
Three Months Ended June 30
2015
 
2014
 
2015
 
2014
Beginning balance, April 1

($5.0
)
 

$7.8

 

$117.7

 

$170.8

Total net gains (losses) (realized/unrealized) included in changes in net assets
(5.0
)
 
0.6

 
—

 
—

Transfers out of Level 3
0.2

 
—

 
—

 
—

Purchases
33.1

 
68.8

 
—

 
—

Sales
(0.4
)
 
—

 
—

 
—

Settlements (a)
(4.6
)
 
(13.0
)
 
(44.3
)
 
22.9

Ending balance, June 30

$18.3

 

$64.2

 

$73.4

 

$193.7

The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30

($4.2
)
 

$0.7

 

$—

 

$—

IPL
Commodity Contract Derivative
 
 
 
Assets and (Liabilities), net
 
Deferred Proceeds
Six Months Ended June 30
2015
 
2014
 
2015
 
2014
Beginning balance, January 1

$19.4

 

$14.6

 

$177.2

 

$203.5

Total net gains (losses) (realized/unrealized) included in changes in net assets
(17.4
)
 
4.4

 
—

 
—

Purchases
33.1

 
68.8

 
—

 
—

Sales
(1.1
)
 
—

 
—

 
—

Settlements (a)
(15.7
)
 
(23.6
)
 
(103.8
)
 
(9.8
)
Ending balance, June 30

$18.3

 

$64.2

 

$73.4

 

$193.7

The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30

($14.3
)
 

$3.7

 

$—

 

$—

WPL
Commodity Contract Derivative
 
Assets and (Liabilities), net
Three Months Ended June 30
2015
 
2014
Beginning balance, April 1

($8.1
)
 

$16.1

Total net gains (losses) (realized/unrealized) included in changes in net assets
(14.6
)
 
16.3

Transfers out of Level 3
0.8

 
—

Purchases
3.7

 
7.9

Settlements
0.5

 
(3.3
)
Ending balance, June 30

($17.7
)
 

$37.0

The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30

($13.5
)
 

$15.6


WPL
Commodity Contract Derivative
 
Assets and (Liabilities), net
Six Months Ended June 30
2015
 
2014
Beginning balance, January 1

($1.5
)
 

($10.2
)
Total net gains (losses) (realized/unrealized) included in changes in net assets
(19.4
)
 
50.3

Transfers out of Level 3
0.6

 
—

Purchases
3.7

 
7.9

Sales
(0.1
)
 
—

Settlements
(1.0
)
 
(11.0
)
Ending balance, June 30

($17.7
)
 

$37.0

The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30

($19.6
)
 

$42.3



(a)
Settlements related to deferred proceeds are due to the change in the carrying amount of receivables sold less the allowance for doubtful accounts associated with the receivables sold and cash proceeds received from the receivables sold.
Fair Value Of Net Derivative Assets (Liabilities)
The fair value of electric, natural gas and coal commodity contracts categorized as Level 3 was recognized as net derivative assets (liabilities) as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
 
Excluding FTRs
 
FTRs
 
Excluding FTRs
 
FTRs
 
Excluding FTRs
 
FTRs
June 30, 2015

($28.3
)
 

$28.9

 

($9.0
)
 

$27.3

 

($19.3
)
 

$1.6

December 31, 2014
(7.0
)
 
24.9

 
(3.2
)
 
22.6

 
(3.8
)
 
2.3