Asset Retirement Obligations (Tables)

2 Months Ended

Dec. 31, 2016

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Change in Asset Retirement Obligation

The following table presents the change in the liability associated with our conditional AROs.

(in millions)	Two Months Ended December 31, 2016
Balance at October 31, 2016	$	14.1
Liabilities incurred in the period	0.7
Liabilities settled	(0.8		)
Accretion expense	0.3
Balance at December 31, 2016	$	14.3