v2.4.0.6

Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2012
Fair Value Disclosures [Abstract] |
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
| Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
September 30, 2012 |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |
Money market fund investments |  | $13.6 |  |  |  | $13.6 |  |  |  | $1.1 |  |  |  | $1.1 |  |  |  | $12.5 |  |  |  | $12.5 |
Derivative assets (Note 10) | 46.5 |  |  | 46.5 |  |  | 28.1 |  |  | 28.1 |  |  | 18.4 |  |  | 18.4 |
Deferred proceeds (sales of receivables) (Note 3) | 153.9 |  |  | 153.9 |  |  | 153.9 |  |  | 153.9 |  |  | — |  |  | — |
Capitalization and liabilities: |  |  |  |  |  |  |  |  |  |  |
Long-term debt (including current maturities) (Note 7(b)) | 2,829.5 |  |  | 3,598.7 |  |  | 1,359.3 |  |  | 1,696.1 |  |  | 1,082.5 |  |  | 1,492.4 |
Cumulative preferred stock of subsidiaries | 205.1 |  |  | 215.6 |  |  | 145.1 |  |  | 154.8 |  |  | 60.0 |  |  | 60.8 |
Derivative liabilities (Note 10) | 57.3 |  |  | 57.3 |  |  | 22.8 |  |  | 22.8 |  |  | 34.5 |  |  | 34.5 |
| Alliant Energy |  | IPL |  | WPL
| Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
December 31, 2011 |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |
Derivative assets (Note 10) |  | $15.7 |  |  |  | $15.7 |  |  |  | $10.6 |  |  |  | $10.6 |  |  |  | $5.1 |  |  |  | $5.1 |
Deferred proceeds (sales of receivables) (Note 3) | 53.7 |  |  | 53.7 |  |  | 53.7 |  |  | 53.7 |  |  | — |  |  | — |
Capitalization and liabilities: |  |  |  |  |  |  |  |  |  |  |
Long-term debt (including current maturities) (Note 7(b)) | 2,704.5 |  |  | 3,325.3 |  |  | 1,309.0 |  |  | 1,560.4 |  |  | 1,082.2 |  |  | 1,439.0 |
Cumulative preferred stock of subsidiaries | 205.1 |  |  | 222.5 |  |  | 145.1 |  |  | 164.3 |  |  | 60.0 |  |  | 58.2 |
Derivative liabilities (Note 10) | 78.0 |  |  | 78.0 |  |  | 33.6 |  |  | 33.6 |  |  | 44.4 |  |  | 44.4 |
Recurring Fair Value Measurements | Items subject to fair value measurement disclosure requirements were as follows (Not Applicable (N/A); in millions):
Alliant Energy | September 30, 2012 |  | December 31, 2011
| Fair |  | Level |  | Level |  | Level |  | Fair |  | Level |  | Level |  | Level
| Value |  | 1 |  | 2 |  | 3 |  | Value |  | 1 |  | 2 |  | 3
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market fund investments |  | $13.6 |  |  |  | $13.6 |  |  |  | $— |  |  |  | $— |  |  |  | $— |  |  |  | $— |  |  |  | $— |  |  |  | $— |
Derivatives - commodity contracts | 46.5 |  |  | — |  |  | 11.9 |  |  | 34.6 |  |  | 15.7 |  |  | — |  |  | 3.4 |  |  | 12.3 |
Deferred proceeds | 153.9 |  |  | — |  |  | — |  |  | 153.9 |  |  | 53.7 |  |  | — |  |  | — |  |  | 53.7 |
Capitalization and liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt (including current maturities) | 3,598.7 |  |  | — |  |  | 3,598.2 |  |  | 0.5 |  |  | N/A |  |  | N/A |  |  | N/A |  |  | N/A |
Cumulative preferred stock of subsidiaries | 215.6 |  |  | 165.2 |  |  | 50.4 |  |  | — |  |  | N/A |  |  | N/A |  |  | N/A |  |  | N/A |
Derivatives - commodity contracts | 57.3 |  |  | — |  |  | 40.3 |  |  | 17.0 |  |  | 78.0 |  |  | — |  |  | 64.8 |  |  | 13.2 |
IPL | September 30, 2012 |  | December 31, 2011
| Fair |  | Level |  | Level |  | Level |  | Fair |  | Level |  | Level |  | Level
| Value |  | 1 |  | 2 |  | 3 |  | Value |  | 1 |  | 2 |  | 3
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market fund investments |  | $1.1 |  |  |  | $1.1 |  |  |  | $— |  |  |  | $— |  |  |  | $— |  |  |  | $— |  |  |  | $— |  |  |  | $— |
Derivatives - commodity contracts | 28.1 |  |  | — |  |  | 8.1 |  |  | 20.0 |  |  | 10.6 |  |  | — |  |  | 1.3 |  |  | 9.3 |
Deferred proceeds | 153.9 |  |  | — |  |  | — |  |  | 153.9 |  |  | 53.7 |  |  | — |  |  | — |  |  | 53.7 |
Capitalization and liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt | 1,696.1 |  |  | — |  |  | 1,696.1 |  |  | — |  |  | N/A |  |  | N/A |  |  | N/A |  |  | N/A |
Cumulative preferred stock | 154.8 |  |  | 154.8 |  |  | — |  |  | — |  |  | N/A |  |  | N/A |  |  | N/A |  |  | N/A |
Derivatives - commodity contracts | 22.8 |  |  | — |  |  | 18.3 |  |  | 4.5 |  |  | 33.6 |  |  | — |  |  | 28.6 |  |  | 5.0 |
WPL | September 30, 2012 |  | December 31, 2011
| Fair |  | Level |  | Level |  | Level |  | Fair |  | Level |  | Level |  | Level
| Value |  | 1 |  | 2 |  | 3 |  | Value |  | 1 |  | 2 |  | 3
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market fund investments |  | $12.5 |  |  |  | $12.5 |  |  |  | $— |  |  |  | $— |  |  |  | $— |  |  |  | $— |  |  |  | $— |  |  |  | $— |
Derivatives - commodity contracts | 18.4 |  |  | — |  |  | 3.8 |  |  | 14.6 |  |  | 5.1 |  |  | — |  |  | 2.1 |  |  | 3.0 |
Capitalization and liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt | 1,492.4 |  |  | — |  |  | 1,492.4 |  |  | — |  |  | N/A |  |  | N/A |  |  | N/A |  |  | N/A |
Cumulative preferred stock | 60.8 |  |  | 10.4 |  |  | 50.4 |  |  | — |  |  | N/A |  |  | N/A |  |  | N/A |  |  | N/A |
Derivatives - commodity contracts | 34.5 |  |  | — |  |  | 22.0 |  |  | 12.5 |  |  | 44.4 |  |  | — |  |  | 36.2 |  |  | 8.2 |
Fair Value Measurements Using Significant Unobservable Inputs | Information for fair value measurements using significant unobservable inputs (Level 3 inputs) for the three and nine months ended September 30 was as follows (in millions):
Alliant Energy | Derivative Assets and (Liabilities), net |  |
| Commodity Contracts |  | Foreign Contracts |  | Deferred Proceeds
Three Months Ended September 30 | 2012 |  | 2011 |  | 2012 |  | 2011 |  | 2012 |  | 2011
Beginning balance, July 1 |  | $18.8 |  |  |  | $18.1 |  |  |  | $— |  |  |  | $2.1 |  |  |  | $81.7 |  |  |  | $66.4 |
Total net losses (realized/unrealized) included in changes in net assets (a) | (2.3 | ) |  | (0.1 | ) |  | — |  |  | — |  |  | — |  |  | — |
Transfers into Level 3 (b) | (0.4 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Transfers out of Level 3 (c) | 9.3 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Settlements (d) | (7.8 | ) |  | (6.1 | ) |  | — |  |  | (1.7 | ) |  | 72.2 |  |  | 21.0 |
Ending balance, September 30 |  | $17.6 |  |  |  | $11.9 |  |  |  | $— |  |  |  | $0.4 |  |  |  | $153.9 |  |  |  | $87.4 |
The amount of total net losses for the period included in changes in net assets attributable to the change in unrealized losses relating to assets and liabilities held at September 30 (a) |  | ($0.7 | ) |  |  | ($0.1 | ) |  |  | $— |  |  |  | $— |  |  |  | $— |  |  |  | $— |
Alliant Energy | Derivative Assets and (Liabilities), net |  |
| Commodity Contracts |  | Foreign Contracts |  | Deferred Proceeds
Nine Months Ended September 30 | 2012 |  | 2011 |  | 2012 |  | 2011 |  | 2012 |  | 2011
Beginning balance, January 1 |  | ($0.9 | ) |  |  | $2.8 |  |  |  | $— |  |  |  | $4.7 |  |  |  | $53.7 |  |  |  | $152.9 |
Total net losses (realized/unrealized) included in changes in net assets (a) | (8.3 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Transfers into Level 3 (b) | (1.7 | ) |  | 0.2 |  |  | — |  |  | — |  |  | — |  |  | — |
Transfers out of Level 3 (c) | 8.3 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Purchases | 35.8 |  |  | 21.8 |  |  | — |  |  | — |  |  | — |  |  | — |
Settlements (d) | (15.6 | ) |  | (12.9 | ) |  | — |  |  | (4.3 | ) |  | 100.2 |  |  | (65.5 | )
Ending balance, September 30 |  | $17.6 |  |  |  | $11.9 |  |  |  | $— |  |  |  | $0.4 |  |  |  | $153.9 |  |  |  | $87.4 |
The amount of total net losses for the period included in changes in net assets attributable to the change in unrealized losses relating to assets and liabilities held at September 30 (a) |  | ($4.4 | ) |  |  | $— |  |  |  | $— |  |  |  | $— |  |  |  | $— |  |  |  | $— |
IPL | Derivative Assets and (Liabilities), net |  |
| Commodity Contracts |  | Foreign Contracts |  | Deferred Proceeds
Three Months Ended September 30 | 2012 |  | 2011 |  | 2012 |  | 2011 |  | 2012 |  | 2011
Beginning balance, July 1 |  | $14.1 |  |  |  | $17.5 |  |  |  | $— |  |  |  | $— |  |  |  | $81.7 |  |  |  | $66.4 |
Total net losses (realized/unrealized) included in changes in net assets (a) | (0.2 | ) |  | (0.1 | ) |  | — |  |  | — |  |  | — |  |  | — |
Transfers out of Level 3 (c) | 7.4 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Settlements (d) | (5.8 | ) |  | (5.0 | ) |  | — |  |  | — |  |  | 72.2 |  |  | 21.0 |
Ending balance, September 30 |  | $15.5 |  |  |  | $12.4 |  |  |  | $— |  |  |  | $— |  |  |  | $153.9 |  |  |  | $87.4 |
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 September 30 (a) |  | $1.4 |  |  |  | ($0.1 | ) |  |  | $— |  |  |  | $— |  |  |  | $— |  |  |  | $— |
IPL | Derivative Assets and (Liabilities), net |  |
| Commodity Contracts |  | Foreign Contracts |  | Deferred Proceeds
Nine Months Ended September 30 | 2012 |  | 2011 |  | 2012 |  | 2011 |  | 2012 |  | 2011
Beginning balance, January 1 |  | $4.3 |  |  |  | $4.3 |  |  |  | $— |  |  |  | $4.8 |  |  |  | $53.7 |  |  |  | $152.9 |
Total net gains (losses) (realized/unrealized) included in changes in net assets (a) | (4.8 | ) |  | 0.4 |  |  | — |  |  | — |  |  | — |  |  | — |
Transfers into Level 3 (b) | (1.1 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Transfers out of Level 3 (c) | 2.4 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Purchases | 26.8 |  |  | 18.1 |  |  | — |  |  | — |  |  | — |  |  | — |
Sales (e) | — |  |  | — |  |  | — |  |  | (2.1 | ) |  | — |  |  | — |
Settlements (d) | (12.1 | ) |  | (10.4 | ) |  | — |  |  | (2.7 | ) |  | 100.2 |  |  | (65.5 | )
Ending balance, September 30 |  | $15.5 |  |  |  | $12.4 |  |  |  | $— |  |  |  | $— |  |  |  | $153.9 |  |  |  | $87.4 |
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 September 30 (a) |  | ($0.7 | ) |  |  | $0.4 |  |  |  | $— |  |  |  | $— |  |  |  | $— |  |  |  | $— |
WPL | Derivative Assets and (Liabilities), net
| Commodity Contracts |  | Foreign Contracts
Three Months Ended September 30 | 2012 |  | 2011 |  | 2012 |  | 2011
Beginning balance, July 1 |  | $4.7 |  |  |  | $0.6 |  |  |  | $— |  |  |  | $— |
Total net losses (realized/unrealized) included in changes in net assets (a) | (2.1 | ) |  | — |  |  | — |  |  | — |
Transfers into Level 3 (b) | (0.4 | ) |  | — |  |  | — |  |  | — |
Transfers out of Level 3 (c) | 1.9 |  |  | — |  |  | — |  |  | — |
Settlements | (2.0 | ) |  | (1.1 | ) |  | — |  |  | — |
Ending balance, September 30 |  | $2.1 |  |  |  | ($0.5 | ) |  |  | $— |  |  |  | $— |
The amount of total net losses for the period included in changes in net assets attributable to the change in unrealized losses relating to assets and liabilities held at September 30 (a) |  | ($2.1 | ) |  |  | $— |  |  |  | $— |  |  |  | $— |
WPL | Derivative Assets and (Liabilities), net
| Commodity Contracts |  | Foreign Contracts
Nine Months Ended September 30 | 2012 |  | 2011 |  | 2012 |  | 2011
Beginning balance, January 1 |  | ($5.2 | ) |  |  | ($1.5 | ) |  |  | $— |  |  |  | ($0.1 | )
Total net losses (realized/unrealized) included in changes in net assets (a) | (3.5 | ) |  | (0.4 | ) |  | — |  |  | — |
Transfers into Level 3 (b) | (0.6 | ) |  | 0.2 |  |  | — |  |  | — |
Transfers out of Level 3 (c) | 5.9 |  |  | — |  |  | — |  |  | — |
Purchases | 9.0 |  |  | 3.7 |  |  | — |  |  | — |
Settlements | (3.5 | ) |  | (2.5 | ) |  | — |  |  | 0.1 |
Ending balance, September 30 |  | $2.1 |  |  |  | ($0.5 | ) |  |  | $— |  |  |  | $— |
The amount of total net losses for the period included in changes in net assets attributable to the change in unrealized losses relating to assets and liabilities held at September 30 (a) |  | ($3.7 | ) |  |  | ($0.4 | ) |  |  | $— |  |  |  | $— |
(a) | Gains and losses related to derivative assets and derivative liabilities are recorded in “Regulatory assets” and “Regulatory liabilities” on the Condensed Consolidated Balance Sheets.
(b) | Markets for similar assets and liabilities became inactive and observable market inputs became unavailable for transfers into Level 3. The transfers were valued as of the beginning of the period.
(c) | Observable market inputs became available for certain commodity contracts previously classified as Level 3 for transfers out of Level 3. The transfers were valued as of the beginning of the period.
(d) | 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.
(e) | The foreign exchange contract was transferred from IPL to Resources in connection with the sale of wind project assets in the second quarter of 2011.

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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income, and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issuances, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19279-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such certain disclosures about the financial instruments, assets, and liabilities include: (1) the fair value of the required items together with their carrying amounts (as appropriate) and (2) the methodology and assumptions used in developing such estimates of fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 14 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 15 -Subparagraph b-d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13476-108611 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13467-108611 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 18 -Subparagraph c(2), d, e, f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a, c(1), c(2), c(3), d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 19 -Subparagraph a, b, c(1), d(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 820 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19190-110258 + Details
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