Redeemable Preferred Stock (Tables)

12 Months Ended

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.