Goodwill (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill And Intangible Assets Disclosure [Abstract]

Changes in Carrying Amount of Goodwill

The Component Products Segment goodwill is assigned to the security products reporting unit within that operating segment.

	Operating segment
	Chemicals		Component Products		Total
		(In millions)
Balance at December 31, 2015, 2016 and 2017	$	352.6	$	27.1	$	379.7