Acquisitions (Tables)

9 Months Ended

Sep. 30, 2012

Acquisitions [Abstract]

Schedule of Purchase Price Allocation [Table Text Block]

The following table presents a summary of the preliminary purchase accounting entries (in millions):

Consideration given:
Cash paid at closing	$	1,394.2
Amounts recognized for preliminary fair value of assets acquired and liabilities assumed:
Proved properties	$	707.6
Unproved properties	686.5
Asset retirement obligations	(0.6		)
Other assets	0.7
Total fair value	$	1,394.2