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Redeemable Preferred Stock | 12 Months Ended
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Dec. 31, 2015
Redeemable Preferred Stock | REDEEMABLE PREFERRED STOCK Information related to the carrying value of IPL’s cumulative preferred stock at December 31 was as follows:
Liquidation Preference/Stated Value |  | Shares Authorized |  | Shares Outstanding |  | Series |  | 2015 |  | 2014
|  |  |  |  |  |  |  | (in millions)
$25 |  | 16,000,000 |  | 8,000,000 |  | 5.1% |  |  | $200.0 |  |  |  | $200.0 |
IPL - In 2013, IPL issued 8,000,000 shares of 5.1% cumulative preferred stock and received proceeds of $200 million. The proceeds were used by IPL to redeem its 8.375% cumulative preferred stock, reduce commercial paper classified as long-term debt by $40 million and for other general corporate purposes. Alliant Energy and IPL incurred $5 million of issuance costs related to this transaction, which were recorded as a reduction of additional paid-in capital on Alliant Energy’s and IPL’s balance sheets in 2013. On or after March 15, 2018, IPL may, at its option, redeem the 5.1% cumulative preferred stock for cash at a redemption price of $25 per share plus accrued and unpaid dividends up to the redemption date. The current articles of incorporation of IPL contain a provision that grants the holders of its cumulative preferred stock voting rights to elect two members of IPL’s Board of Directors if preferred dividends equal to six or more quarterly dividend requirements (whether or not consecutive) are in arrears. Such voting rights would not provide the holders of IPL’s preferred stock control of the decision on redemption of IPL’s preferred stock and could not force IPL to exercise its call option. Therefore, IPL’s cumulative preferred stock is presented in total equity on Alliant Energy’s and IPL’s balance sheets in a manner consistent with noncontrolling interests. 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 income statements. Refer to Note 14 for information on the fair value of cumulative preferred stock. WPL - 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.
IPL [Member] |
Redeemable Preferred Stock | REDEEMABLE PREFERRED STOCK Information related to the carrying value of IPL’s cumulative preferred stock at December 31 was as follows:
Liquidation Preference/Stated Value |  | Shares Authorized |  | Shares Outstanding |  | Series |  | 2015 |  | 2014
|  |  |  |  |  |  |  | (in millions)
$25 |  | 16,000,000 |  | 8,000,000 |  | 5.1% |  |  | $200.0 |  |  |  | $200.0 |
IPL - In 2013, IPL issued 8,000,000 shares of 5.1% cumulative preferred stock and received proceeds of $200 million. The proceeds were used by IPL to redeem its 8.375% cumulative preferred stock, reduce commercial paper classified as long-term debt by $40 million and for other general corporate purposes. Alliant Energy and IPL incurred $5 million of issuance costs related to this transaction, which were recorded as a reduction of additional paid-in capital on Alliant Energy’s and IPL’s balance sheets in 2013. On or after March 15, 2018, IPL may, at its option, redeem the 5.1% cumulative preferred stock for cash at a redemption price of $25 per share plus accrued and unpaid dividends up to the redemption date. The current articles of incorporation of IPL contain a provision that grants the holders of its cumulative preferred stock voting rights to elect two members of IPL’s Board of Directors if preferred dividends equal to six or more quarterly dividend requirements (whether or not consecutive) are in arrears. Such voting rights would not provide the holders of IPL’s preferred stock control of the decision on redemption of IPL’s preferred stock and could not force IPL to exercise its call option. Therefore, IPL’s cumulative preferred stock is presented in total equity on Alliant Energy’s and IPL’s balance sheets in a manner consistent with noncontrolling interests. 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 income statements. Refer to Note 14 for information on the fair value of cumulative preferred stock. WPL - 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.
WPL [Member] |
Redeemable Preferred Stock | REDEEMABLE PREFERRED STOCK Information related to the carrying value of IPL’s cumulative preferred stock at December 31 was as follows:
Liquidation Preference/Stated Value |  | Shares Authorized |  | Shares Outstanding |  | Series |  | 2015 |  | 2014
|  |  |  |  |  |  |  | (in millions)
$25 |  | 16,000,000 |  | 8,000,000 |  | 5.1% |  |  | $200.0 |  |  |  | $200.0 |
IPL - In 2013, IPL issued 8,000,000 shares of 5.1% cumulative preferred stock and received proceeds of $200 million. The proceeds were used by IPL to redeem its 8.375% cumulative preferred stock, reduce commercial paper classified as long-term debt by $40 million and for other general corporate purposes. Alliant Energy and IPL incurred $5 million of issuance costs related to this transaction, which were recorded as a reduction of additional paid-in capital on Alliant Energy’s and IPL’s balance sheets in 2013. On or after March 15, 2018, IPL may, at its option, redeem the 5.1% cumulative preferred stock for cash at a redemption price of $25 per share plus accrued and unpaid dividends up to the redemption date. The current articles of incorporation of IPL contain a provision that grants the holders of its cumulative preferred stock voting rights to elect two members of IPL’s Board of Directors if preferred dividends equal to six or more quarterly dividend requirements (whether or not consecutive) are in arrears. Such voting rights would not provide the holders of IPL’s preferred stock control of the decision on redemption of IPL’s preferred stock and could not force IPL to exercise its call option. Therefore, IPL’s cumulative preferred stock is presented in total equity on Alliant Energy’s and IPL’s balance sheets in a manner consistent with noncontrolling interests. 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 income statements. Refer to Note 14 for information on the fair value of cumulative preferred stock. WPL - 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.

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