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Redeemable Preferred Stock (Tables) | 12 Months Ended
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Dec. 31, 2013
Class of Stock [Line Items] |
Schedule of Carrying Value Of Cumulative Preferred Stock | Information related to the carrying value of cumulative preferred stock, net at December 31 was as follows (dollars in millions):
Liquidation Preference/ Stated Value |  | Shares Outstanding |  | Series |  | Redemption (none are mandatorily redeemable) |  | 2013 |  | 2012
IPL (16,000,000 shares authorized): |  |  |  |  |  |
$25 |  | 8,000,000 |  | 5.1% |  | On or after March 15, 2018 |  |  | $200.0 |  |  |  | $— |
$25 |  | 6,000,000 |  | 8.375% |  | (a) |  | — |  |  | 150.0 |
Less: discount |  |  |  |  |  |  |  | — |  |  | (4.9 | )
|  |  |  |  |  |  |  | 200.0 |  |  | 145.1 |
WPL (16,000,000 and 3,750,000 shares authorized as of December 31, 2013 and 2012, respectively): |  |
$25 to $100 |  | 1,049,225 |  | 4.40-6.50% |  | (b) |  | — |  |  | 60.0 |
Alliant Energy |  |  |  |  |  |  |  |  | $200.0 |  |  |  | $205.1 |
(a) | In 2013, IPL redeemed all 6,000,000 outstanding shares of its 8.375% cumulative preferred stock for $150 million plus accrued and unpaid dividends to the redemption date. Alliant Energy and IPL recorded a $5 million charge in 2013 related to this transaction in “Preferred dividend requirements” in their Consolidated Statements of Income.
(b) | In 2013, WPL redeemed all 1,049,225 outstanding shares of its 4.40% through 6.50% cumulative preferred stock for $61 million plus accrued and unpaid dividends to the redemption date. Alliant Energy and WPL recorded a $1 million charge in 2013 related to this transaction in “Preferred dividend requirements” in their Consolidated Statements of Income.
IPL [Member] |
Class of Stock [Line Items] |
Schedule of Carrying Value Of Cumulative Preferred Stock | Information related to the carrying value of cumulative preferred stock, net at December 31 was as follows (dollars in millions):
Liquidation Preference/ Stated Value |  | Shares Outstanding |  | Series |  | Redemption (none are mandatorily redeemable) |  | 2013 |  | 2012
IPL (16,000,000 shares authorized): |  |  |  |  |  |
$25 |  | 8,000,000 |  | 5.1% |  | On or after March 15, 2018 |  |  | $200.0 |  |  |  | $— |
$25 |  | 6,000,000 |  | 8.375% |  | (a) |  | — |  |  | 150.0 |
Less: discount |  |  |  |  |  |  |  | — |  |  | (4.9 | )
|  |  |  |  |  |  |  | 200.0 |  |  | 145.1 |
WPL (16,000,000 and 3,750,000 shares authorized as of December 31, 2013 and 2012, respectively): |  |
$25 to $100 |  | 1,049,225 |  | 4.40-6.50% |  | (b) |  | — |  |  | 60.0 |
Alliant Energy |  |  |  |  |  |  |  |  | $200.0 |  |  |  | $205.1 |
(a) | In 2013, IPL redeemed all 6,000,000 outstanding shares of its 8.375% cumulative preferred stock for $150 million plus accrued and unpaid dividends to the redemption date. Alliant Energy and IPL recorded a $5 million charge in 2013 related to this transaction in “Preferred dividend requirements” in their Consolidated Statements of Income.
(b) | In 2013, WPL redeemed all 1,049,225 outstanding shares of its 4.40% through 6.50% cumulative preferred stock for $61 million plus accrued and unpaid dividends to the redemption date. Alliant Energy and WPL recorded a $1 million charge in 2013 related to this transaction in “Preferred dividend requirements” in their Consolidated Statements of Income.
WPL [Member] |
Class of Stock [Line Items] |
Schedule of Carrying Value Of Cumulative Preferred Stock | Information related to the carrying value of cumulative preferred stock, net at December 31 was as follows (dollars in millions):
Liquidation Preference/ Stated Value |  | Shares Outstanding |  | Series |  | Redemption (none are mandatorily redeemable) |  | 2013 |  | 2012
IPL (16,000,000 shares authorized): |  |  |  |  |  |
$25 |  | 8,000,000 |  | 5.1% |  | On or after March 15, 2018 |  |  | $200.0 |  |  |  | $— |
$25 |  | 6,000,000 |  | 8.375% |  | (a) |  | — |  |  | 150.0 |
Less: discount |  |  |  |  |  |  |  | — |  |  | (4.9 | )
|  |  |  |  |  |  |  | 200.0 |  |  | 145.1 |
WPL (16,000,000 and 3,750,000 shares authorized as of December 31, 2013 and 2012, respectively): |  |
$25 to $100 |  | 1,049,225 |  | 4.40-6.50% |  | (b) |  | — |  |  | 60.0 |
Alliant Energy |  |  |  |  |  |  |  |  | $200.0 |  |  |  | $205.1 |
(a) | In 2013, IPL redeemed all 6,000,000 outstanding shares of its 8.375% cumulative preferred stock for $150 million plus accrued and unpaid dividends to the redemption date. Alliant Energy and IPL recorded a $5 million charge in 2013 related to this transaction in “Preferred dividend requirements” in their Consolidated Statements of Income.
(b) | In 2013, WPL redeemed all 1,049,225 outstanding shares of its 4.40% through 6.50% cumulative preferred stock for $61 million plus accrued and unpaid dividends to the redemption date. Alliant Energy and WPL recorded a $1 million charge in 2013 related to this transaction in “Preferred dividend requirements” in their Consolidated Statements of Income.

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