Inventories, Net (Tables)

3 Months Ended

Mar. 31, 2016

Inventory Disclosure [Abstract]

Inventories, Net

	December 31, 2015		March 31, 2016
	(In millions)
Raw materials:
Chemicals	$	75.9	$	76.3
Component products		2.8		2.8
Total raw materials		78.7		79.1
Work in process:
Chemicals		21.1		22.6
Component products		9.3		9.1
Total in-process products		30.4		31.7
Finished products:
Chemicals		233.1		220.2
Component products		3.0		2.6
Total finished products		236.1		222.8
Supplies (primarily chemicals)		60.0		61.3
Total	$	405.2	$	394.9