Asset Retirement Obligations (Tables)

9 Months Ended

Sep. 30, 2014

Asset Retirement Obligation Disclosure [Abstract]

Changes in Asset Retirement Obligations

The change in our asset retirement obligations during the nine months ended September 30, 2014 is set forth below:

	Nine Months Ended September 30, 2014
	(In millions)
Asset retirement obligations as of the beginning of the period, including current portion	$	502.5
Liabilities incurred		24.4
Liabilities settled		(46.6	)
Divestment of properties		(136.4	)
Accretion expense		21.8
Revision of estimates		43.9
Asset retirement obligations as of the end of the period, including current portion	$	409.6