v2.4.0.6

Redeemable Preferred Stock (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 1 Months Ended | 3 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Redeemable Preferred Stock [Member] | Dec. 31, 2011 Redeemable Preferred Stock [Member] | Dec. 31, 2012 IPL [Member] | Dec. 31, 2011 IPL [Member] | Dec. 31, 2010 IPL [Member] | Dec. 31, 2012 IPL [Member] Redeemable Preferred Stock [Member] | Dec. 31, 2011 IPL [Member] Redeemable Preferred Stock [Member] | Dec. 31, 2012 IPL [Member] Redeemable Preferred Stock [Member] 8.375% [Member] | Dec. 31, 2011 IPL [Member] Redeemable Preferred Stock [Member] 8.375% [Member] | Mar. 31, 2013 IPL [Member] Redeemable Preferred Stock [Member] 8.375% [Member] Subsequent Event [Member] Scenario, Forecast [Member] | Dec. 31, 2012 WPL [Member] | Dec. 31, 2011 WPL [Member] | Dec. 31, 2010 WPL [Member] | Dec. 31, 2012 WPL [Member] Redeemable Preferred Stock [Member] | Dec. 31, 2011 WPL [Member] Redeemable Preferred Stock [Member] | Dec. 31, 2012 WPL [Member] Redeemable Preferred Stock [Member] 4.50% [Member] | Dec. 31, 2011 WPL [Member] Redeemable Preferred Stock [Member] 4.50% [Member] | Dec. 31, 2012 WPL [Member] Redeemable Preferred Stock [Member] 4.80% [Member] | Dec. 31, 2011 WPL [Member] Redeemable Preferred Stock [Member] 4.80% [Member] | Dec. 31, 2012 WPL [Member] Redeemable Preferred Stock [Member] 4.96% [Member] | Dec. 31, 2011 WPL [Member] Redeemable Preferred Stock [Member] 4.96% [Member] | Dec. 31, 2012 WPL [Member] Redeemable Preferred Stock [Member] 4.40% [Member] | Dec. 31, 2011 WPL [Member] Redeemable Preferred Stock [Member] 4.40% [Member] | Dec. 31, 2012 WPL [Member] Redeemable Preferred Stock [Member] 4.76% [Member] | Dec. 31, 2011 WPL [Member] Redeemable Preferred Stock [Member] 4.76% [Member] | Dec. 31, 2012 WPL [Member] Redeemable Preferred Stock [Member] 6.20% [Member] | Dec. 31, 2011 WPL [Member] Redeemable Preferred Stock [Member] 6.20% [Member] | Dec. 31, 2012 WPL [Member] Redeemable Preferred Stock [Member] 6.50% [Member] | Dec. 31, 2011 WPL [Member] Redeemable Preferred Stock [Member] 6.50% [Member] | Mar. 31, 2013 WPL [Member] Redeemable Preferred Stock [Member] 4.40% through 6.50% [Member] Subsequent Event [Member] Scenario, Forecast [Member] | Mar. 31, 2013 Alliant Energy And IPL [Member] Redeemable Preferred Stock [Member] 8.375% [Member] Subsequent Event [Member] Scenario, Forecast [Member] | Mar. 31, 2013 Alliant Energy and WPL [Member] Redeemable Preferred Stock [Member] 4.40% through 6.50% [Member] Subsequent Event [Member] Scenario, Forecast [Member]
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liquidation Preference/Stated Value (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liquidation Preference/Stated Value (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 | [1] |  |  | $ 100 | [1] |  |  | $ 100 | [1] |  |  | $ 100 | [1] |  |  | $ 100 | [1] |  |  | $ 100 | [1] |  |  | $ 25 | [1] |  |  |  |  |
Authorized Shares |  |  |  |  |  |  |  |  |  |  | 16,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,750,000 |  |  |  | 3,750,000 |  |  |  | 3,750,000 |  |  |  | 3,750,000 |  |  |  | 3,750,000 |  |  |  | 3,750,000 |  |  |  | 3,750,000 |  |  |  |  |  |
Shares Outstanding |  |  |  |  |  |  |  |  |  |  | 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 99,970 | [1] |  |  | 74,912 | [1] |  |  | 64,979 | [1] |  |  | 29,957 | [1] |  |  | 29,947 | [1] |  |  | 150,000 | [1] |  |  | 599,460 | [1] |  |  |  |  |
Series |  |  |  |  |  | 8.375% |  |  |  |  | 8.375% |  |  | 4.50% |  |  |  |  | 4.50% | [1] |  |  | 4.80% | [1] |  |  | 4.96% | [1] |  |  | 4.40% | [1] |  |  | 4.76% | [1] |  |  | 6.20% | [1] |  |  | 6.50% | [1] |  |  |  |  |
Redemption (none are mandatorily redeemable) |  |  |  |  |  |  |  |  |  |  | On or after March 15, 2013 |  |  |  |  |  |  |  | Any time | [1] |  |  | Any time | [1] |  |  | Any time | [1] |  |  | Any time | [1] |  |  | Any time | [1] |  |  | Any time | [1] |  |  | Any time | [1] |  |  |  |  |
Cumulative preferred stock value, at par | $ 145.1 | $ 145.1 |  |  |  | $ 145.1 | $ 145.1 |  | $ 145.1 | $ 145.1 | $ 150.0 | $ 150.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Less: discount |  |  |  |  |  |  |  |  | (4.9) | (4.9) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative preferred stock | 60.0 | 60.0 |  |  |  |  |  |  |  |  |  |  |  | 60.0 | 60.0 |  | 60.0 | 60.0 | 10.0 | [1] | 10.0 | [1] | 7.5 | [1] | 7.5 | [1] | 6.5 | [1] | 6.5 | [1] | 3.0 | [1] | 3.0 | [1] | 3.0 | [1] | 3.0 | [1] | 15.0 | [1] | 15.0 | [1] | 15.0 | [1] | 15.0 | [1] |  |  |
Preferred stock and temporary equity net carrying amount |  |  |  | 205.1 | 205.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock called during period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,049,225 |  |
Stock redeemed during period, value |  |  |  |  |  |  |  |  |  |  |  |  | 150 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 61 |  |
Preferred dividends | $ 15.9 | $ 18.3 | $ 18.7 |  |  | $ 12.6 | $ 15.0 | $ 15.4 |  |  |  |  |  | $ 3.3 | $ 3.3 | $ 3.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.0 | $ 1.0
[1] | WPL has 3,750,000 authorized shares in total.

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- Definition Equity impact of aggregate cash, stock, and paid-in-kind dividends declared for preferred shareholders during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 14 -Subparagraph l -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 SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
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- Definition Face amount or stated value per share of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer); generally not indicative of the fair market value per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 3, 4, 5, 6, 7, 8 -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 AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The excess of (1) the carrying amount of the preferred stock in the registrant's balance sheet over (2) the fair value of the consideration transferred to the holders of the preferred stock, during the accounting period, which will be added to net earnings to arrive at net earnings available to common shareholders in the calculation of earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section S99 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6802175&loc=d3e42851-122695 + Details
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- Definition Number of stock bought back by the entity at the exercise price or redemption price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4, 5 -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 Equity impact of the value of stock bought back by the entity at the exercise price or redemption price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4, 5 -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 Carrying amount, attributable to parent, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer. + References No definition available. + Details
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- Definition Face amount or stated value per share of stock classified as temporary equity; generally not indicative of the fair market value per share. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 28 -Article 5 + Details
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- Definition The maximum number of securities classified as temporary equity that are permitted to be issued by an entity's charter and bylaws. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 3, 4, 5, 6, 7, 8 -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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.27(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 28 -Subparagraph b -Article 5 + Details
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- Definition The number of securities classified as temporary equity that have been issued and are held by the entity's shareholders. Securities outstanding equals securities issued minus securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.27(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 28 -Subparagraph b -Article 5 + Details
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