Restructuring and Other Items, net (Tables)

12 Months Ended

Dec. 31, 2021

Restructuring and Other Items, net [Abstract]

Restructuring Charges by Segment

The following table outlines the amount of restructuring charges recorded within the Consolidated Statements of Income and the segments they relate to:

Restructuring and Other Items, net	Year Ended December 31,
(millions of dollars)	2021		2020		2019
Asset Write-Downs
Performance Materials	$	—	$	—	$	5.9
Specialty Minerals		0.7		7.1		1.6
Total asset write-down charges	$	0.7	$	7.1	$	7.5
Severance and other costs
Performance Materials	$	—	$	—	$	2.9
Specialty Minerals		0.4		0.5		0.9
Refractories		—		—		0.8
Corporate		—		—		1.1
Total severance and other employee costs	$	0.4	$	0.5	$	5.7
Total restructuring and other items, net	$	1.1	$	7.6	$	13.2

Reconciliation of Restructuring Liability

The following table is a reconciliation of our restructuring liability balance as of December 31, 2021 and 2020:

	December 31,
(millions of dollars)	2021			2020
Restructuring liability, beginning of period	$	3.6		$	5.0
Additional provisions		0.1			0.3
Cash payments		(1.5	)		(1.6	)
Other		—			(0.1	)
Restructuring liability, end of period	$	2.2		$	3.6