Asset Retirement Obligation (Tables)

12 Months Ended

Dec. 31, 2016

Asset Retirement Obligations

Schedule of Change in Asset Retirement Obligation

The schedule below summarizes the changes in the Partnership’s asset retirement obligations (in millions):

	Year Ended
	December 31,
	2016		2015
Beginning asset retirement obligations	$	14.0	$	20.6
Revisions to the fair values of existing liabilities		(0.5)		(4.0)
Accretion expense		0.6		0.6
Liabilities settled		(0.6)		(3.2)
Ending asset retirement obligations	$	13.5	$	14.0