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Benefit Plans (Defined Benefit Pension And Other Postretirement Benefits Plans) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended
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Dec. 31, 2011 Defined Benefit Pension Plans [Member] | Sep. 30, 2011 Cash Balance Plan [Member] | Sep. 30, 2011 Cash Balance Plan [Member] | Sep. 30, 2012 Alliant Energy [Member] Defined Benefit Pension Plans [Member] | Sep. 30, 2011 Alliant Energy [Member] Defined Benefit Pension Plans [Member] | Sep. 30, 2012 Alliant Energy [Member] Defined Benefit Pension Plans [Member] | Sep. 30, 2011 Alliant Energy [Member] Defined Benefit Pension Plans [Member] | Sep. 30, 2012 Alliant Energy [Member] Other Postretirement Benefits Plans [Member] | Sep. 30, 2011 Alliant Energy [Member] Other Postretirement Benefits Plans [Member] | Sep. 30, 2012 Alliant Energy [Member] Other Postretirement Benefits Plans [Member] | Sep. 30, 2011 Alliant Energy [Member] Other Postretirement Benefits Plans [Member] | Sep. 30, 2012 IPL [Member] Other Postretirement Benefits Plans [Member] | Sep. 30, 2011 IPL [Member] Other Postretirement Benefits Plans [Member] | Sep. 30, 2012 IPL [Member] Other Postretirement Benefits Plans [Member] | Sep. 30, 2011 IPL [Member] Other Postretirement Benefits Plans [Member] | Sep. 30, 2012 IPL [Member] Qualified Defined Benefit Pension Plans [Member] | Sep. 30, 2011 IPL [Member] Qualified Defined Benefit Pension Plans [Member] | Sep. 30, 2012 IPL [Member] Qualified Defined Benefit Pension Plans [Member] | Sep. 30, 2011 IPL [Member] Qualified Defined Benefit Pension Plans [Member] | Sep. 30, 2012 IPL [Member] Directly assigned defined benefit pension plans [Member] | Sep. 30, 2011 IPL [Member] Directly assigned defined benefit pension plans [Member] | Sep. 30, 2012 IPL [Member] Directly assigned defined benefit pension plans [Member] | Sep. 30, 2011 IPL [Member] Directly assigned defined benefit pension plans [Member] | Sep. 30, 2011 IPL [Member] Corporate Service Allocation [Member] | Sep. 30, 2011 IPL [Member] Corporate Service Allocation [Member] | Sep. 30, 2011 IPL [Member] Cash Balance Plan [Member] | Sep. 30, 2011 IPL [Member] Cash Balance Plan [Member] | Sep. 30, 2012 WPL [Member] Other Postretirement Benefits Plans [Member] | Sep. 30, 2011 WPL [Member] Other Postretirement Benefits Plans [Member] | Sep. 30, 2012 WPL [Member] Other Postretirement Benefits Plans [Member] | Sep. 30, 2011 WPL [Member] Other Postretirement Benefits Plans [Member] | Sep. 30, 2012 WPL [Member] Qualified Defined Benefit Pension Plans [Member] | Sep. 30, 2011 WPL [Member] Qualified Defined Benefit Pension Plans [Member] | Sep. 30, 2012 WPL [Member] Qualified Defined Benefit Pension Plans [Member] | Sep. 30, 2011 WPL [Member] Qualified Defined Benefit Pension Plans [Member] | Sep. 30, 2012 WPL [Member] Directly assigned defined benefit pension plans [Member] | Sep. 30, 2011 WPL [Member] Directly assigned defined benefit pension plans [Member] | Sep. 30, 2012 WPL [Member] Directly assigned defined benefit pension plans [Member] | Sep. 30, 2011 WPL [Member] Directly assigned defined benefit pension plans [Member] | Sep. 30, 2011 WPL [Member] Corporate Service Allocation [Member] | Sep. 30, 2011 WPL [Member] Corporate Service Allocation [Member] | Sep. 30, 2011 WPL [Member] Cash Balance Plan [Member] | Sep. 30, 2011 WPL [Member] Cash Balance Plan [Member]
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  |  |  | $ 3.3 |  | $ 2.9 |  | $ 10.0 |  | $ 8.6 |  | $ 1.7 |  | $ 1.6 |  | $ 5.2 |  | $ 5.4 |  | $ 0.7 | $ 0.6 | $ 2.2 | $ 2.0 | $ 1.8 | $ 1.5 | $ 5.6 | $ 4.6 |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.7 | $ 0.7 | $ 2.1 | $ 2.2 | $ 1.3 | $ 1.1 | $ 3.9 | $ 3.4 |  |  |  |  |  |  |  |  |  |  |  |
Interest cost |  |  |  | 13.0 |  | 13.0 |  | 38.9 |  | 39.0 |  | 2.6 |  | 2.8 |  | 7.7 |  | 9.5 |  | 1.1 | 1.3 | 3.3 | 4.3 | 4.3 | 4.2 | 12.8 | 12.5 | 1.8 |  | 1.9 |  | 5.3 |  | 5.6 |  |  |  |  |  | 1.0 | 1.1 | 3.1 | 3.7 | 4.1 | 4.1 | 12.3 | 12.1 | 1.3 |  | 1.4 |  | 3.9 |  | 4.1 |  |  |  |  |
Expected return on plan assets |  |  |  | (17.2) |  | (15.9) |  | (51.6) |  | (47.8) |  | (1.9) |  | (2.0) |  | (5.7) |  | (5.9) |  | (1.3) | (1.4) | (3.9) | (4.0) | (5.8) | (5.0) | (17.3) | (15.0) | (2.4) |  | (2.4) |  | (7.2) |  | (7.3) |  |  |  |  |  | (0.3) | (0.3) | (1.0) | (1.0) | (5.6) | (5.0) | (16.8) | (15.0) | (1.9) |  | (1.9) |  | (5.5) |  | (5.5) |  |  |  |  |
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost (credit) |  |  |  | 0.1 |  | 0.2 |  | 0.2 |  | 0.6 |  | (3.0) |  | (3.4) |  | (9.0) |  | (6.6) |  | (1.5) | (1.8) | (4.7) | (3.3) | 0.1 | 0.2 | 0.3 | 0.4 | (0.1) |  | (0.1) |  | (0.2) |  | (0.2) |  |  |  |  |  | (1.0) | (1.1) | (2.9) | (2.2) | 0.2 | 0.1 | 0.4 | 0.4 | 0 |  | 0 |  | (0.1) |  | (0.1) |  |  |  |  |
Actuarial loss |  |  |  | 8.3 |  | 5.2 |  | 24.9 |  | 15.7 |  | 1.6 |  | 1.2 |  | 4.7 |  | 4.0 |  | 0.9 | 0.7 | 2.7 | 2.2 | 2.6 | 1.4 | 7.7 | 4.3 | 1.0 |  | 0.7 |  | 2.9 |  | 2.2 |  |  |  |  |  | 0.6 | 0.5 | 1.7 | 1.6 | 3.0 | 1.8 | 9.1 | 5.3 | 0.9 |  | 0.8 |  | 2.7 |  | 2.2 |  |  |  |  |
Additional benefits costs | 10.0 | 1.3 | 10.2 | 0 | [1] | 1.3 | [1] | 0 | [1] | 10.2 | [1] | 0 | [1] | 0 | [1] | 0 | [1] | 0 | [1] |  |  |  |  |  |  |  |  | 0 | [1] | 0.6 | [1] | 0 | [1] | 2.8 | [1] | 0.2 | 3.5 | 0.8 | 6.3 |  |  |  |  |  |  |  |  | 0 | [1] | 0.1 | [1] | 0 | [1] | 0.7 | [1] | 0.3 | 2.7 | 0.4 | 3.4
Settlement loss |  |  |  | 0 |  | 1.1 |  | 0 |  | 1.1 |  | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total |  |  |  | $ 7.5 |  | $ 7.8 |  | $ 22.4 |  | $ 27.4 |  | $ 1.0 |  | $ 0.2 |  | $ 2.9 |  | $ 6.4 |  | $ (0.1) | $ (0.6) | $ (0.4) | $ 1.2 | $ 3.0 | $ 2.3 | $ 9.1 | $ 6.8 | $ 0.3 |  | $ 0.7 |  | $ 0.8 |  | $ 3.1 |  |  |  |  |  | $ 1.0 | $ 0.9 | $ 3.0 | $ 4.3 | $ 3.0 | $ 2.1 | $ 8.9 | $ 6.2 | $ 0.3 |  | $ 0.4 |  | $ 1.0 |  | $ 1.4 |  |  |  |  |
[1] | Alliant Energy reached an agreement with the IRS, which resulted in a favorable determination letter for the Cash Balance Plan during the first quarter of 2011. The agreement with the IRS required Alliant Energy to amend the Cash Balance Plan, which was completed in the second quarter of 2011, resulting in aggregate additional benefits of $10.2 million paid by Alliant Energy to certain former participants in the Cash Balance Plan in the second half of 2011. Alliant Energy recognized $1.3 million and $10.2 million of additional benefits costs during the three and nine months ended September 30, 2011, respectively, related to these benefits. IPL recognized $0.8 million ($0.6 million directly assigned and $0.2 million allocated by Corporate Services) and $6.3 million ($2.8 million directly assigned and $3.5 million allocated by Corporate Services) of additional benefits costs during the three and nine months ended September 30, 2011, respectively, related to these benefits. WPL recognized $0.4 million ($0.1 million directly assigned and $0.3 million allocated by Corporate Services) and $3.4 million ($0.7 million directly assigned and $2.7 million allocated by Corporate Services) of additional benefits costs during the three and nine months ended September 30, 2011, respectively, related to these benefits. Refer to Note 11(c) for additional information regarding the Cash Balance Plan.

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- Definition The amount of gains or losses recognized in net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph h -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 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph h -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 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512136 -Topic 715 -SubTopic 30 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph h -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 -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512171 -Topic 715 -SubTopic 60 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 -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 Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 -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 The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 -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 Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph a, h -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 The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph h -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 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition The amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts to cover vested benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Number 88 -Name Statement of Financial Accounting Standard (FAS) -Paragraph 3 -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 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph h -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 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6412315&loc=d3e8001-114927 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 -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 Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 -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 The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 -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 -Glossary Service Cost (Component of Net Periodic Pension Cost) -URI http://asc.fasb.org/extlink&oid=6525008 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 -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 Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph a, h -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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