XML 50 R31.htm IDEA: XBRL DOCUMENT v3.5.0.2
Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2016
Statement [Line Items]  
Fair Value Measurements
Carrying amounts and related estimated fair values of other financial instruments were as follows (in millions):
Alliant Energy
June 30, 2016
 
December 31, 2015
 
 
 
Fair Value
 
 
 
Fair Value
 
Carrying
 
Level
 
Level
 
Level
 
 
 
Carrying
 
Level
 
Level
 
Level
 
 
 
Amount
 
1
 
2
 
3
 
Total
 
Amount
 
1
 
2
 
3
 
Total
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Derivatives

$36.9

 

$—

 

$3.2

 

$33.7

 

$36.9

 

$18.4

 

$—

 

$2.5

 

$15.9

 

$18.4

Deferred proceeds
74.4

 
—

 
—

 
74.4

 
74.4

 
172.0

 
—

 
—

 
172.0

 
172.0

Liabilities and equity:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Derivatives
37.1

 
—

 
4.0

 
33.1

 
37.1

 
64.6

 
—

 
16.0

 
48.6

 
64.6

Long-term debt (including current maturities)
3,902.4

 
—

 
4,647.2

 
3.3

 
4,650.5

 
3,835.6

 
—

 
4,332.4

 
3.7

 
4,336.1

Cumulative preferred stock of IPL
200.0

 
218.3

 
—

 
—

 
218.3

 
200.0

 
206.6

 
—

 
—

 
206.6

IPL
June 30, 2016
 
December 31, 2015
 
 
 
Fair Value
 
 
 
Fair Value
 
Carrying
 
Level
 
Level
 
Level
 
 
 
Carrying
 
Level
 
Level
 
Level
 
 
 
Amount
 
1
 
2
 
3
 
Total
 
Amount
 
1
 
2
 
3
 
Total
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Derivatives

$28.1

 

$—

 

$1.8

 

$26.3

 

$28.1

 

$15.5

 

$—

 

$2.0

 

$13.5

 

$15.5

Deferred proceeds
74.4

 
—

 
—

 
74.4

 
74.4

 
172.0

 
—

 
—

 
172.0

 
172.0

Liabilities and equity:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Derivatives
9.8

 
—

 
1.8

 
8.0

 
9.8

 
23.4

 
—

 
8.0

 
15.4

 
23.4

Long-term debt (including current maturities)
1,924.8

 
—

 
2,271.3

 
—

 
2,271.3

 
1,856.9

 
—

 
2,092.7

 
—

 
2,092.7

Cumulative preferred stock
200.0

 
218.3

 
—

 
—

 
218.3

 
200.0

 
206.6

 
—

 
—

 
206.6

WPL
June 30, 2016
 
December 31, 2015
 
 
 
Fair Value
 
 
 
Fair Value
 
Carrying
 
Level
 
Level
 
Level
 
 
 
Carrying
 
Level
 
Level
 
Level
 
 
 
Amount
 
1
 
2
 
3
 
Total
 
Amount
 
1
 
2
 
3
 
Total
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Derivatives

$8.8

 

$—

 

$1.4

 

$7.4

 

$8.8

 

$2.9

 

$—

 

$0.5

 

$2.4

 

$2.9

Liabilities and equity:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Derivatives
27.3

 
—

 
2.2

 
25.1

 
27.3

 
41.2

 
—

 
8.0

 
33.2

 
41.2

Long-term debt (including current maturities)
1,534.6

 
—

 
1,923.5

 
—

 
1,923.5

 
1,533.9

 
—

 
1,793.0

 
—

 
1,793.0
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
2016
 
2015
 
2016
 
2015
Beginning balance, April 1

($65.9
)
 

($13.1
)
 

$154.2

 

$117.7

Total net gains (losses) included in changes in net assets (realized/unrealized)
44.6

 
(19.6
)
 
—

 
—

Transfers out of Level 3
0.4

 
1.0

 
—

 
—

Purchases
22.0

 
36.8

 
—

 
—

Sales
(0.1
)
 
(0.4
)
 
—

 
—

Settlements (a)
(0.4
)
 
(4.1
)
 
(79.8
)
 
(44.3
)
Ending balance, June 30

$0.6

 

$0.6

 

$74.4

 

$73.4

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

$44.8

 

($17.7
)
 

$—

 

$—

Alliant Energy
Commodity Contract Derivative
 
 
 
Assets and (Liabilities), net
 
Deferred Proceeds
Six Months Ended June 30
2016
 
2015
 
2016
 
2015
Beginning balance, January 1

($32.7
)
 

$17.9

 

$172.0

 

$177.2

Total net gains (losses) included in changes in net assets (realized/unrealized)
13.1

 
(36.8
)
 
—

 
—

Transfers into Level 3
0.9

 
—

 
—

 
—

Transfers out of Level 3
0.4

 
0.6

 
—

 
—

Purchases
22.0

 
36.8

 
—

 
—

Sales
(0.7
)
 
(1.2
)
 
—

 
—

Settlements (a)
(2.4
)
 
(16.7
)
 
(97.6
)
 
(103.8
)
Ending balance, June 30

$0.6

 

$0.6

 

$74.4

 

$73.4

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

$14.8

 

($33.9
)
 

$—

 

$—

IPL
Commodity Contract Derivative
 
 
 
Assets and (Liabilities), net
 
Deferred Proceeds
Three Months Ended June 30
2016
 
2015
 
2016
 
2015
Beginning balance, April 1

($13.1
)
 

($5.0
)
 

$154.2

 

$117.7

Total net gains (losses) included in changes in net assets (realized/unrealized)
12.9

 
(5.0
)
 
—

 
—

Transfers out of Level 3
(0.1
)
 
0.2

 
—

 
—

Purchases
20.6

 
33.1

 
—

 
—

Sales
(0.1
)
 
(0.4
)
 
—

 
—

Settlements (a)
(1.9
)
 
(4.6
)
 
(79.8
)
 
(44.3
)
Ending balance, June 30

$18.3

 

$18.3

 

$74.4

 

$73.4

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

$12.8

 

($4.2
)
 

$—

 

$—

IPL
Commodity Contract Derivative
 
 
 
Assets and (Liabilities), net
 
Deferred Proceeds
Six Months Ended June 30
2016
 
2015
 
2016
 
2015
Beginning balance, January 1

($1.9
)
 

$19.4

 

$172.0

 

$177.2

Total net gains (losses) included in changes in net assets (realized/unrealized)
5.2

 
(17.4
)
 
—

 
—

Transfers into Level 3
0.5

 
—

 
—

 
—

Transfers out of Level 3
(0.1
)
 
—

 
—

 
—

Purchases
20.6

 
33.1

 
—

 
—

Sales
(0.7
)
 
(1.1
)
 
—

 
—

Settlements (a)
(5.3
)
 
(15.7
)
 
(97.6
)
 
(103.8
)
Ending balance, June 30

$18.3

 

$18.3

 

$74.4

 

$73.4

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

$6.2

 

($14.3
)
 

$—

 

$—

WPL
Commodity Contract Derivative
 
Assets and (Liabilities), net
Three Months Ended June 30
2016
 
2015
Beginning balance, April 1

($52.8
)
 

($8.1
)
Total net gains (losses) included in changes in net assets (realized/unrealized)
31.7

 
(14.6
)
Transfers out of Level 3
0.5

 
0.8

Purchases
1.4

 
3.7

Settlements
1.5

 
0.5

Ending balance, June 30

($17.7
)
 

($17.7
)
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

$32.0

 

($13.5
)

WPL
Commodity Contract Derivative
 
Assets and (Liabilities), net
Six Months Ended June 30
2016
 
2015
Beginning balance, January 1

($30.8
)
 

($1.5
)
Total net gains (losses) included in changes in net assets (realized/unrealized)
7.9

 
(19.4
)
Transfers into Level 3
0.4

 
—

Transfers out of Level 3
0.5

 
0.6

Purchases
1.4

 
3.7

Sales
—

 
(0.1
)
Settlements
2.9

 
(1.0
)
Ending balance, June 30

($17.7
)
 

($17.7
)
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

$8.6

 

($19.6
)

(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, 2016

($22.9
)
 

$23.5

 

($3.4
)
 

$21.7

 

($19.5
)
 

$1.8

December 31, 2015
(43.1
)
 
10.4

 
(12.3
)
 
10.4

 
(30.8
)
 
—
IPL [Member]  
Statement [Line Items]  
Fair Value Measurements
Carrying amounts and related estimated fair values of other financial instruments were as follows (in millions):
Alliant Energy
June 30, 2016
 
December 31, 2015
 
 
 
Fair Value
 
 
 
Fair Value
 
Carrying
 
Level
 
Level
 
Level
 
 
 
Carrying
 
Level
 
Level
 
Level
 
 
 
Amount
 
1
 
2
 
3
 
Total
 
Amount
 
1
 
2
 
3
 
Total
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Derivatives

$36.9

 

$—

 

$3.2

 

$33.7

 

$36.9

 

$18.4

 

$—

 

$2.5

 

$15.9

 

$18.4

Deferred proceeds
74.4

 
—

 
—

 
74.4

 
74.4

 
172.0

 
—

 
—

 
172.0

 
172.0

Liabilities and equity:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Derivatives
37.1

 
—

 
4.0

 
33.1

 
37.1

 
64.6

 
—

 
16.0

 
48.6

 
64.6

Long-term debt (including current maturities)
3,902.4

 
—

 
4,647.2

 
3.3

 
4,650.5

 
3,835.6

 
—

 
4,332.4

 
3.7

 
4,336.1

Cumulative preferred stock of IPL
200.0

 
218.3

 
—

 
—

 
218.3

 
200.0

 
206.6

 
—

 
—

 
206.6

IPL
June 30, 2016
 
December 31, 2015
 
 
 
Fair Value
 
 
 
Fair Value
 
Carrying
 
Level
 
Level
 
Level
 
 
 
Carrying
 
Level
 
Level
 
Level
 
 
 
Amount
 
1
 
2
 
3
 
Total
 
Amount
 
1
 
2
 
3
 
Total
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Derivatives

$28.1

 

$—

 

$1.8

 

$26.3

 

$28.1

 

$15.5

 

$—

 

$2.0

 

$13.5

 

$15.5

Deferred proceeds
74.4

 
—

 
—

 
74.4

 
74.4

 
172.0

 
—

 
—

 
172.0

 
172.0

Liabilities and equity:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Derivatives
9.8

 
—

 
1.8

 
8.0

 
9.8

 
23.4

 
—

 
8.0

 
15.4

 
23.4

Long-term debt (including current maturities)
1,924.8

 
—

 
2,271.3

 
—

 
2,271.3

 
1,856.9

 
—

 
2,092.7

 
—

 
2,092.7

Cumulative preferred stock
200.0

 
218.3

 
—

 
—

 
218.3

 
200.0

 
206.6

 
—

 
—

 
206.6

WPL
June 30, 2016
 
December 31, 2015
 
 
 
Fair Value
 
 
 
Fair Value
 
Carrying
 
Level
 
Level
 
Level
 
 
 
Carrying
 
Level
 
Level
 
Level
 
 
 
Amount
 
1
 
2
 
3
 
Total
 
Amount
 
1
 
2
 
3
 
Total
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Derivatives

$8.8

 

$—

 

$1.4

 

$7.4

 

$8.8

 

$2.9

 

$—

 

$0.5

 

$2.4

 

$2.9

Liabilities and equity:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Derivatives
27.3

 
—

 
2.2

 
25.1

 
27.3

 
41.2

 
—

 
8.0

 
33.2

 
41.2

Long-term debt (including current maturities)
1,534.6

 
—

 
1,923.5

 
—

 
1,923.5

 
1,533.9

 
—

 
1,793.0

 
—

 
1,793.0
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
2016
 
2015
 
2016
 
2015
Beginning balance, April 1

($65.9
)
 

($13.1
)
 

$154.2

 

$117.7

Total net gains (losses) included in changes in net assets (realized/unrealized)
44.6

 
(19.6
)
 
—

 
—

Transfers out of Level 3
0.4

 
1.0

 
—

 
—

Purchases
22.0

 
36.8

 
—

 
—

Sales
(0.1
)
 
(0.4
)
 
—

 
—

Settlements (a)
(0.4
)
 
(4.1
)
 
(79.8
)
 
(44.3
)
Ending balance, June 30

$0.6

 

$0.6

 

$74.4

 

$73.4

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

$44.8

 

($17.7
)
 

$—

 

$—

Alliant Energy
Commodity Contract Derivative
 
 
 
Assets and (Liabilities), net
 
Deferred Proceeds
Six Months Ended June 30
2016
 
2015
 
2016
 
2015
Beginning balance, January 1

($32.7
)
 

$17.9

 

$172.0

 

$177.2

Total net gains (losses) included in changes in net assets (realized/unrealized)
13.1

 
(36.8
)
 
—

 
—

Transfers into Level 3
0.9

 
—

 
—

 
—

Transfers out of Level 3
0.4

 
0.6

 
—

 
—

Purchases
22.0

 
36.8

 
—

 
—

Sales
(0.7
)
 
(1.2
)
 
—

 
—

Settlements (a)
(2.4
)
 
(16.7
)
 
(97.6
)
 
(103.8
)
Ending balance, June 30

$0.6

 

$0.6

 

$74.4

 

$73.4

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

$14.8

 

($33.9
)
 

$—

 

$—

IPL
Commodity Contract Derivative
 
 
 
Assets and (Liabilities), net
 
Deferred Proceeds
Three Months Ended June 30
2016
 
2015
 
2016
 
2015
Beginning balance, April 1

($13.1
)
 

($5.0
)
 

$154.2

 

$117.7

Total net gains (losses) included in changes in net assets (realized/unrealized)
12.9

 
(5.0
)
 
—

 
—

Transfers out of Level 3
(0.1
)
 
0.2

 
—

 
—

Purchases
20.6

 
33.1

 
—

 
—

Sales
(0.1
)
 
(0.4
)
 
—

 
—

Settlements (a)
(1.9
)
 
(4.6
)
 
(79.8
)
 
(44.3
)
Ending balance, June 30

$18.3

 

$18.3

 

$74.4

 

$73.4

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

$12.8

 

($4.2
)
 

$—

 

$—

IPL
Commodity Contract Derivative
 
 
 
Assets and (Liabilities), net
 
Deferred Proceeds
Six Months Ended June 30
2016
 
2015
 
2016
 
2015
Beginning balance, January 1

($1.9
)
 

$19.4

 

$172.0

 

$177.2

Total net gains (losses) included in changes in net assets (realized/unrealized)
5.2

 
(17.4
)
 
—

 
—

Transfers into Level 3
0.5

 
—

 
—

 
—

Transfers out of Level 3
(0.1
)
 
—

 
—

 
—

Purchases
20.6

 
33.1

 
—

 
—

Sales
(0.7
)
 
(1.1
)
 
—

 
—

Settlements (a)
(5.3
)
 
(15.7
)
 
(97.6
)
 
(103.8
)
Ending balance, June 30

$18.3

 

$18.3

 

$74.4

 

$73.4

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

$6.2

 

($14.3
)
 

$—

 

$—

WPL
Commodity Contract Derivative
 
Assets and (Liabilities), net
Three Months Ended June 30
2016
 
2015
Beginning balance, April 1

($52.8
)
 

($8.1
)
Total net gains (losses) included in changes in net assets (realized/unrealized)
31.7

 
(14.6
)
Transfers out of Level 3
0.5

 
0.8

Purchases
1.4

 
3.7

Settlements
1.5

 
0.5

Ending balance, June 30

($17.7
)
 

($17.7
)
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

$32.0

 

($13.5
)

WPL
Commodity Contract Derivative
 
Assets and (Liabilities), net
Six Months Ended June 30
2016
 
2015
Beginning balance, January 1

($30.8
)
 

($1.5
)
Total net gains (losses) included in changes in net assets (realized/unrealized)
7.9

 
(19.4
)
Transfers into Level 3
0.4

 
—

Transfers out of Level 3
0.5

 
0.6

Purchases
1.4

 
3.7

Sales
—

 
(0.1
)
Settlements
2.9

 
(1.0
)
Ending balance, June 30

($17.7
)
 

($17.7
)
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

$8.6

 

($19.6
)

(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, 2016

($22.9
)
 

$23.5

 

($3.4
)
 

$21.7

 

($19.5
)
 

$1.8

December 31, 2015
(43.1
)
 
10.4

 
(12.3
)
 
10.4

 
(30.8
)
 
—
WPL [Member]  
Statement [Line Items]  
Fair Value Measurements
Carrying amounts and related estimated fair values of other financial instruments were as follows (in millions):
Alliant Energy
June 30, 2016
 
December 31, 2015
 
 
 
Fair Value
 
 
 
Fair Value
 
Carrying
 
Level
 
Level
 
Level
 
 
 
Carrying
 
Level
 
Level
 
Level
 
 
 
Amount
 
1
 
2
 
3
 
Total
 
Amount
 
1
 
2
 
3
 
Total
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Derivatives

$36.9

 

$—

 

$3.2

 

$33.7

 

$36.9

 

$18.4

 

$—

 

$2.5

 

$15.9

 

$18.4

Deferred proceeds
74.4

 
—

 
—

 
74.4

 
74.4

 
172.0

 
—

 
—

 
172.0

 
172.0

Liabilities and equity:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Derivatives
37.1

 
—

 
4.0

 
33.1

 
37.1

 
64.6

 
—

 
16.0

 
48.6

 
64.6

Long-term debt (including current maturities)
3,902.4

 
—

 
4,647.2

 
3.3

 
4,650.5

 
3,835.6

 
—

 
4,332.4

 
3.7

 
4,336.1

Cumulative preferred stock of IPL
200.0

 
218.3

 
—

 
—

 
218.3

 
200.0

 
206.6

 
—

 
—

 
206.6

IPL
June 30, 2016
 
December 31, 2015
 
 
 
Fair Value
 
 
 
Fair Value
 
Carrying
 
Level
 
Level
 
Level
 
 
 
Carrying
 
Level
 
Level
 
Level
 
 
 
Amount
 
1
 
2
 
3
 
Total
 
Amount
 
1
 
2
 
3
 
Total
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Derivatives

$28.1

 

$—

 

$1.8

 

$26.3

 

$28.1

 

$15.5

 

$—

 

$2.0

 

$13.5

 

$15.5

Deferred proceeds
74.4

 
—

 
—

 
74.4

 
74.4

 
172.0

 
—

 
—

 
172.0

 
172.0

Liabilities and equity:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Derivatives
9.8

 
—

 
1.8

 
8.0

 
9.8

 
23.4

 
—

 
8.0

 
15.4

 
23.4

Long-term debt (including current maturities)
1,924.8

 
—

 
2,271.3

 
—

 
2,271.3

 
1,856.9

 
—

 
2,092.7

 
—

 
2,092.7

Cumulative preferred stock
200.0

 
218.3

 
—

 
—

 
218.3

 
200.0

 
206.6

 
—

 
—

 
206.6

WPL
June 30, 2016
 
December 31, 2015
 
 
 
Fair Value
 
 
 
Fair Value
 
Carrying
 
Level
 
Level
 
Level
 
 
 
Carrying
 
Level
 
Level
 
Level
 
 
 
Amount
 
1
 
2
 
3
 
Total
 
Amount
 
1
 
2
 
3
 
Total
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Derivatives

$8.8

 

$—

 

$1.4

 

$7.4

 

$8.8

 

$2.9

 

$—

 

$0.5

 

$2.4

 

$2.9

Liabilities and equity:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Derivatives
27.3

 
—

 
2.2

 
25.1

 
27.3

 
41.2

 
—

 
8.0

 
33.2

 
41.2

Long-term debt (including current maturities)
1,534.6

 
—

 
1,923.5

 
—

 
1,923.5

 
1,533.9

 
—

 
1,793.0

 
—

 
1,793.0
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
2016
 
2015
 
2016
 
2015
Beginning balance, April 1

($65.9
)
 

($13.1
)
 

$154.2

 

$117.7

Total net gains (losses) included in changes in net assets (realized/unrealized)
44.6

 
(19.6
)
 
—

 
—

Transfers out of Level 3
0.4

 
1.0

 
—

 
—

Purchases
22.0

 
36.8

 
—

 
—

Sales
(0.1
)
 
(0.4
)
 
—

 
—

Settlements (a)
(0.4
)
 
(4.1
)
 
(79.8
)
 
(44.3
)
Ending balance, June 30

$0.6

 

$0.6

 

$74.4

 

$73.4

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

$44.8

 

($17.7
)
 

$—

 

$—

Alliant Energy
Commodity Contract Derivative
 
 
 
Assets and (Liabilities), net
 
Deferred Proceeds
Six Months Ended June 30
2016
 
2015
 
2016
 
2015
Beginning balance, January 1

($32.7
)
 

$17.9

 

$172.0

 

$177.2

Total net gains (losses) included in changes in net assets (realized/unrealized)
13.1

 
(36.8
)
 
—

 
—

Transfers into Level 3
0.9

 
—

 
—

 
—

Transfers out of Level 3
0.4

 
0.6

 
—

 
—

Purchases
22.0

 
36.8

 
—

 
—

Sales
(0.7
)
 
(1.2
)
 
—

 
—

Settlements (a)
(2.4
)
 
(16.7
)
 
(97.6
)
 
(103.8
)
Ending balance, June 30

$0.6

 

$0.6

 

$74.4

 

$73.4

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

$14.8

 

($33.9
)
 

$—

 

$—

IPL
Commodity Contract Derivative
 
 
 
Assets and (Liabilities), net
 
Deferred Proceeds
Three Months Ended June 30
2016
 
2015
 
2016
 
2015
Beginning balance, April 1

($13.1
)
 

($5.0
)
 

$154.2

 

$117.7

Total net gains (losses) included in changes in net assets (realized/unrealized)
12.9

 
(5.0
)
 
—

 
—

Transfers out of Level 3
(0.1
)
 
0.2

 
—

 
—

Purchases
20.6

 
33.1

 
—

 
—

Sales
(0.1
)
 
(0.4
)
 
—

 
—

Settlements (a)
(1.9
)
 
(4.6
)
 
(79.8
)
 
(44.3
)
Ending balance, June 30

$18.3

 

$18.3

 

$74.4

 

$73.4

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

$12.8

 

($4.2
)
 

$—

 

$—

IPL
Commodity Contract Derivative
 
 
 
Assets and (Liabilities), net
 
Deferred Proceeds
Six Months Ended June 30
2016
 
2015
 
2016
 
2015
Beginning balance, January 1

($1.9
)
 

$19.4

 

$172.0

 

$177.2

Total net gains (losses) included in changes in net assets (realized/unrealized)
5.2

 
(17.4
)
 
—

 
—

Transfers into Level 3
0.5

 
—

 
—

 
—

Transfers out of Level 3
(0.1
)
 
—

 
—

 
—

Purchases
20.6

 
33.1

 
—

 
—

Sales
(0.7
)
 
(1.1
)
 
—

 
—

Settlements (a)
(5.3
)
 
(15.7
)
 
(97.6
)
 
(103.8
)
Ending balance, June 30

$18.3

 

$18.3

 

$74.4

 

$73.4

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

$6.2

 

($14.3
)
 

$—

 

$—

WPL
Commodity Contract Derivative
 
Assets and (Liabilities), net
Three Months Ended June 30
2016
 
2015
Beginning balance, April 1

($52.8
)
 

($8.1
)
Total net gains (losses) included in changes in net assets (realized/unrealized)
31.7

 
(14.6
)
Transfers out of Level 3
0.5

 
0.8

Purchases
1.4

 
3.7

Settlements
1.5

 
0.5

Ending balance, June 30

($17.7
)
 

($17.7
)
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

$32.0

 

($13.5
)

WPL
Commodity Contract Derivative
 
Assets and (Liabilities), net
Six Months Ended June 30
2016
 
2015
Beginning balance, January 1

($30.8
)
 

($1.5
)
Total net gains (losses) included in changes in net assets (realized/unrealized)
7.9

 
(19.4
)
Transfers into Level 3
0.4

 
—

Transfers out of Level 3
0.5

 
0.6

Purchases
1.4

 
3.7

Sales
—

 
(0.1
)
Settlements
2.9

 
(1.0
)
Ending balance, June 30

($17.7
)
 

($17.7
)
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

$8.6

 

($19.6
)

(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, 2016

($22.9
)
 

$23.5

 

($3.4
)
 

$21.7

 

($19.5
)
 

$1.8

December 31, 2015
(43.1
)
 
10.4

 
(12.3
)
 
10.4

 
(30.8
)
 
—