Plant Closures and Divestitures (Tables)

12 Months Ended

Dec. 31, 2021

Discontinued Operations And Disposal Groups [Abstract]

Summary of Restructuring Activities and Related Reserves

Details of the restructuring activities and related reserves are as follows:

	Severance and employee benefits			Asset retirement			Other			Total
(Dollars in millions)
Reserve at December 31, 2019	$	0.9		$	0.7		$	2.4		$	4.0
Accrual		0.5			2.9			3.4			6.8
Costs charged against assets		0.0			0.0			(3.4	)		(3.4	)
Reversal of accrued charges		(0.3	)		0.0			0.0			(0.3	)
Cash paid		(0.2	)		(0.8	)		(0.3	)		(1.3	)
Currency translation		0.0			0.0			0.2			0.2
Reserve at December 31, 2020	$	0.9		$	2.8		$	2.3		$	6.0
Accrual		0.0			0.0			2.4			2.4
Costs charged against assets		0.0			0.0			(2.4	)		(2.4	)
Reversal of accrued charges		(0.2	)		(0.7	)		0.0			(0.9	)
Cash paid		(0.7	)		(1.9	)		0.0			(2.6	)
Sale of subsidiary		0.0			(0.2	)		(2.3	)		(2.5	)
Reserve at December 31, 2021	$	0.0		$	0.0		$	0.0		$	0.0