Business Segments (Tables)

3 Months Ended

Mar. 31, 2022

Segment Reporting [Abstract]

Financial Data for Continuing Operation for Company's Reportable Business Segments

The following table displays selected financial data for the Company’s reportable segments. Total revenues, as well as the consolidated statements of earnings and comprehensive earnings, exclude intersegment revenues, which represent sales from one segment to another segment and are eliminated in consolidation. Total revenues, product and services revenues, and earnings (loss) from operations reflect continuing operations only.

	Three Months Ended
	March 31,
	2022			2021
	(Dollars in Millions)
Total revenues:
East Group	$	418.8		$	394.9
West Group		735.0			516.6
Total Building Materials business		1,153.8			911.5
Magnesia Specialties		77.0			70.9
Total	$	1,230.8		$	982.4
Products and services revenues:
East Group	$	394.6		$	372.5
West Group		682.4			484.1
Total Building Materials business		1,077.0			856.6
Magnesia Specialties		70.8			65.3
Total	$	1,147.8		$	921.9
Earnings (Loss) from operations:
East Group	$	28.0		$	61.7
West Group		43.0			31.9
Total Building Materials business		71.0			93.6
Magnesia Specialties		21.5			23.5
Corporate		(32.6	)		(17.8	)
Total	$	59.9		$	99.3