Asset Retirement Obligations

9 Months Ended

Sep. 30, 2015

Asset Retirement Obligation Disclosure [Abstract]

Asset Retirement Obligations

Asset Retirement Obligations

The change in our asset retirement obligations during the nine months ended September 30, 2015 is set forth below:

	Nine Months Ended September 30, 2015
	(In millions)
Asset retirement obligations as of the beginning of the period, including current portion	$	316.4
Liabilities incurred	10.3
Liabilities settled	(59.8		)
Accretion expense	19.3
Asset retirement obligations as of the end of the period, including current portion	$	286.2