Regulatory Assets & Liabilities (Tables)

12 Months Ended

Dec. 31, 2011

Regulatory Assets and Liabilities [Abstract]

Schedule of Regulatory Assets

Regulatory assets consist of the following:

	At December 31,
(In millions)	2011		2010
Future amounts recoverable from ratepayers related to:
Benefit obligations (See Note 11)	$	126.0	$	92.5
Deferred Income taxes (See Notes 10 & 18)		1.3		19.2
Asset retirement obligations & other		2.3		2.1
		129.6		113.8
Amounts deferred for future recovery related to:
Deferred coal costs (See Note 20)		17.7		-
Cost recovery riders & other		6.4		2.8
		24.1		2.8
Amounts currently recovered in customer rates related to:
Unamortized debt issue costs & hedging proceeds		34.3		35.7
Demand side management programs		6.3		9.5
Indiana authorized trackers		24.3		17.3
Ohio authorized trackers		1.0		2.0
Premiums paid to reacquire debt		3.3		3.8
Other base rate recoveries		3.1		4.5
		72.3		72.8
Total regulatory assets	$	226.0	$	189.4