Inventories, Net (Tables)

12 Months Ended

Dec. 31, 2015

Inventory Disclosure [Abstract]

Inventories, Net

	December 31,
	2014		2015
	(In millions)
Raw materials:
Chemicals	$	76.0	$	75.9
Component products		3.4		2.8
Total raw materials		79.4		78.7
Work in process:
Chemicals		32.9		21.1
Component products		10.3		9.3
Total in-process products		43.2		30.4
Finished products:
Chemicals		253.2		233.1
Component products		3.2		3.0
Total finished products		256.4		236.1
Supplies (primarily chemicals)		64.0		60.0
Total	$	443.0	$	405.2