Inventories, Net (Tables)

12 Months Ended

Dec. 31, 2016

Inventory Disclosure [Abstract]

Inventories, Net

	December 31,
	2015		2016
	(In millions)
Raw materials:
Chemicals	$	75.9	$	68.7
Component products		2.8		2.7
Total raw materials		78.7		71.4
Work in process:
Chemicals		21.1		22.3
Component products		9.3		9.0
Total in-process products		30.4		31.3
Finished products:
Chemicals		233.1		196.4
Component products		3.0		3.2
Total finished products		236.1		199.6
Supplies (primarily chemicals)		60.0		58.3
Total	$	405.2	$	360.6