Restructuring and Other Items, net (Tables)

12 Months Ended

Dec. 31, 2019

Restructuring and Other Items, net [Abstract]

Schedule of Restructuring Charges

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)	2019		2018		2017
Asset Write-Downs
Performance Materials	$	4.2	$	—	$	—
Specialty Minerals		1.6		0.7		5.3
Energy Services		1.7		—		—
Total asset write-down charges	$	7.5	$	0.7	$	5.3
Severance and other employee costs
Performance Materials	$	2.8	$	—	$	—
Specialty Minerals		0.9		—		5.0
Refractories		0.8		—		—
Energy Services		0.1		1.8		1.7
Corporate		1.1		—		4.1
Total severance and other employee costs	$	5.7	$	1.8	$	10.8
Other
Energy Services	$	—	$	—	$	(1.1	)
Total restructuring and other items, net	$	13.2	$	2.5	$	15.0

Reconciliation of Restructuring Liability

The following table is a reconciliation of our restructuring liability balance:

(millions of dollars)
Restructuring liability, December 31, 2018	$	2.5
Additional provisions		5.7
Cash payments		(3.2	)
Other		—
Restructuring liability, December 31, 2019	$	5.0