Redeemable Preferred Stock (Tables)

12 Months Ended

Dec. 31, 2014

Class of Stock [Line Items]

Schedule of Carrying Value Of Cumulative 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	2014		2013
				(in millions)
$25	16,000,000	8,000,000	5.1%		$200.0		$200.0

IPL [Member]

Class of Stock [Line Items]

Schedule of Carrying Value Of Cumulative 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	2014		2013
				(in millions)
$25	16,000,000	8,000,000	5.1%		$200.0		$200.0