Inventories, Net (Tables)

3 Months Ended

Mar. 31, 2020

Inventory Disclosure [Abstract]

Inventories, Net

	December31,		March 31,
	2019		2020
	(In millions)
Raw materials:
Chemicals	$	124.4	$	125.5
Component products		2.9		3.1
Total raw materials		127.3		128.6
Work in process:
Chemicals		39.0		43.0
Component products		11.8		12.2
Total in-process products		50.8		55.2
Finished products:
Chemicals		270.7		246.7
Component products		3.6		3.6
Total finished products		274.3		250.3
Supplies (chemicals)		69.7		65.1
Total	$	522.1	$	499.2