Supplementary Data to Statements of Operations (Tables)

12 Months Ended

Dec. 31, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Summary of Supplementary Data to Statements of Operations

	Year Ended December 31,
	2019		2018			2017
	(Dollars in millions)
Other Expense (Income), Net
Foreign currency translation expense (income)	$	0.4	$	(2.9	)	$	7.3
Net periodic benefit plan expense, excluding service costs		5.2		2.7			1.5
Total other expense (income), net	$	5.6	$	(0.2	)	$	8.8