Redeemable Preferred Stock (Tables)

12 Months Ended

Dec. 31, 2011

Redeemable Preferred Stock [Abstract]

Schedule Of Carrying Value Of Cumulative Preferred Stock

Liquidation Preference / Stated Value	Authorized Shares			Shares Outstanding			Series			Redemption (a)	2011			2010
IPL:
$25		16,000,000			6,000,000			8.375	%	On or after March 15, 2013	$	150.0		$	150.0
(b)		—			(b	)		(b	)	(b)		—			40.0
												150.0			190.0
Less: discount												(4.9	)		(6.2	)
												145.1			183.8
WPL:
$100		(c	)		99,970			4.50	%	Any time		10.0			10.0
$100		(c	)		74,912			4.80	%	Any time		7.5			7.5
$100		(c	)		64,979			4.96	%	Any time		6.5			6.5
$100		(c	)		29,957			4.40	%	Any time		3.0			3.0
$100		(c	)		29,947			4.76	%	Any time		3.0			3.0
$100		(c	)		150,000			6.20	%	Any time		15.0			15.0
$25		(c	)		599,460			6.50	%	Any time		15.0			15.0
												60.0			60.0
											$	205.1		$	243.8

(a) None are mandatorily redeemable.

(b) In 2011, IPL redeemed all 1,600,000 outstanding shares of its 7.10% Series C Cumulative Preferred Stock at the $25 par value for $40.0 million plus accrued and unpaid dividends up to the redemption date.

(c) WPL has 3,750,000 authorized shares in total.