Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2012

Reconciliation Of Asset Retirement Obligation Liability

	2012		2011
	(In Millions)
Balance as of January 1	$	16.6	$	15.6
Accretion Expense		1.0		1.0
Balance as of December 31	$	17.6	$	16.6

Indianapolis Power And Light Company [Member]

Reconciliation Of Asset Retirement Obligation Liability

	2012		2011
	(In Millions)
Balance as of January 1	$	16.6	$	15.6
Accretion Expense		1.0		1.0
Balance as of December 31	$	17.6	$	16.6