Segment Information (Tables)

12 Months Ended

Dec. 31, 2023

Segment Reporting [Abstract]

Summary of Consolidated Financial Information of our Operations by Geographic Location

The following tables summarize consolidated financial information of our operations by geographic location based on where sales originated or where the assets are held:

	Year Ended December 31,
Sales	2023				2022				2021
	(Dollars in millions)
United States	$	4,642.3	91	%	$	5,765.0	91	%	$	5,123.7	90	%
Foreign countries		466.4	9	%		558.6	9	%		551.6	10	%
Total	$	5,108.7	100	%	$	6,323.6	100	%	$	5,675.3	100	%

	At December 31,
Long-Lived Assets	2023				2022				2021
	(Dollars in millions)
United States	$	890.9	95	%	$	657.7	94	%	$	557.8	93	%
Foreign countries		48.1	5	%		41.2	6	%		41.6	7	%
Total	$	939.0	100	%	$	698.9	100	%	$	599.4	100	%