Asset Retirement Obligation (Tables)

12 Months Ended

Dec. 31, 2019

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Change in Asset Retirement Obligation

	Year Ended December 31,
(in millions)	2019			2018
Balance, at beginning of period	$	34.2		$	34.7
Accretion expense	2.5			2.4
Additions	0.3			0.2
Liabilities settled	(2.1		)	(2.7		)
Foreign currency translation adjustments	0.2			(0.4		)
Balance, at end of period	$	35.1		$	34.2