Property, Plant and Equipment, Net (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Schedule of property, plant and equipment, net

Property, plant and equipment—net consisted of the following:

	December 31,
	2017		2016
	(in millions)
Land	$	1.4	$	1.4
Buildings and improvements	16.9		16.7
Machinery and equipment	568.3		562.3
Construction in progress	41.1		21.9
Property, plant and equipment	627.7		602.3
Less: Accumulated depreciation and amortization	337.5		301.0
Property, plant and equipment—net	$	290.2	$	301.3

Summary of plant turnaround activity

The following is a summary of capitalized plant turnaround costs:

	Year ended December 31,
	2017			2016			2015
	(in millions)
Net capitalized turnaround costs:
Beginning balance	$	26.6		$	37.8		$	16.7
Additions	2.3			4.9			33.6
Depreciation	(14.2		)	(16.1		)	(12.5		)
Ending balance	$	14.7		$	26.6		$	37.8