Asset Retirement Obligation

3 Months Ended

Mar. 31, 2015

Asset Retirement Obligation Disclosure [Abstract]

Asset Retirement Obligation Disclosure

(10)Asset Retirement Obligations

The schedule below summarizes the changes in the Company’s asset retirement obligations:

	March 31, 2015			March 31, 2014
	(in millions)
Beginning asset retirement obligations	$	19.1		$	7.7
Revisions to existing liabilities	(3.9		)	—
Liabilities acquired	—			0.5
Accretion	0.1			0.2
Liabilities settled	(3.2		)	—
Ending asset retirement obligations	$	12.1		$	8.4

Asset retirement obligations of $1.1 million as of March 31, 2015 are included in Other Current Liabilities.