Inventories, Net (Tables)

9 Months Ended

Sep. 30, 2016

Inventory Disclosure [Abstract]

Inventories, Net

	December 31, 2015		September 30, 2016
	(In millions)
Raw materials:
Chemicals	$	75.9	$	60.1
Component products		2.8		2.7
Total raw materials		78.7		62.8
Work in process:
Chemicals		21.1		25.4
Component products		9.3		9.1
Total in-process products		30.4		34.5
Finished products:
Chemicals		233.1		171.3
Component products		3.0		2.8
Total finished products		236.1		174.1
Supplies (primarily chemicals)		60.0		62.7
Total	$	405.2	$	334.1