Business Segments (Tables)

9 Months Ended

Sep. 30, 2021

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 presented on 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.

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2021			2020			2021			2020
	(Dollars in Millions)
Total revenues:
East Group	$	684.1		$	549.3		$	1,714.4		$	1,465.9
West Group		794.8			711.2			1,978.2			1,904.2
Total Building Materials business		1,478.9			1,260.5			3,692.6			3,370.1
Magnesia Specialties		78.4			60.9			225.0			180.2
Total	$	1,557.3		$	1,321.4		$	3,917.6		$	3,550.3
Products and services revenues:
East Group	$	641.8		$	514.1		$	1,610.9		$	1,371.8
West Group		749.0			671.4			1,861.9			1,785.4
Total Building Materials business		1,390.8			1,185.5			3,472.8			3,157.2
Magnesia Specialties		71.9			55.2			207.1			164.0
Total	$	1,462.7		$	1,240.7		$	3,679.9		$	3,321.2
Earnings (Loss) from operations:
East Group	$	205.8		$	181.4		$	465.3		$	386.1
West Group		150.6			212.3			284.2			368.2
Total Building Materials business		356.4			393.7			749.5			754.3
Magnesia Specialties		23.1			16.4			69.8			51.2
Corporate		(22.6	)		(9.5	)		(55.6	)		(40.7	)
Total	$	356.9		$	400.6		$	763.7		$	764.8

	September 30, 2021		December 31, 2020
Assets employed:	(Dollars in Millions)
East Group	$	5,075.9	$	4,342.5
West Group		5,613.4		5,355.5
Total Building Materials business		10,689.3		9,698.0
Magnesia Specialties		169.6		167.9
Corporate		2,927.3		714.9
Total	$	13,786.2	$	10,580.8