Inventories, Net (Tables)

3 Months Ended

Mar. 31, 2017

Inventory Disclosure [Abstract]

Inventories, Net

	December 31, 2016		March 31, 2017
	(In millions)
Raw materials:
Chemicals	$	68.7	$	79.1
Component products		2.7		2.8
Total raw materials		71.4		81.9
Work in process:
Chemicals		22.3		22.1
Component products		9.0		9.8
Total in-process products		31.3		31.9
Finished products:
Chemicals		196.4		200.0
Component products		3.2		2.8
Total finished products		199.6		202.8
Supplies (primarily chemicals)		58.3		61.5
Total	$	360.6	$	378.1