Goodwill (Tables)

12 Months Ended

Dec. 31, 2023

Goodwill And Intangible Assets Disclosure [Abstract]

Changes in Carrying Amount of Goodwill

	Operating segment
			Component
	Chemicals		Products		Total
	(In millions)
Balance at December 31, 2021, 2022 and 2023	$	352.6	$	27.1	$	379.7