As of December 31, 2023, the Building Materials business is comprised of four divisions that represent individual operating segments. These operating segments are consolidated into two reportable segments, the East Group and the West Group, for financial reporting purposes as they meet the aggregation criteria. The Magnesia Specialties business represents an individual operating and reportable segment. The accounting policies used for segment reporting are the same as those described in Note A.

The Chief Operating Decision Maker’s evaluation of performance and allocation of resources are based primarily on earnings from operations. Segment earnings from operations include total revenues less cost of revenues; selling, general and administrative expenses; other operating income and expenses, net; and exclude interest income and expense; other nonoperating income and expenses, net; and income tax expense. Corporate loss from operations primarily includes depreciation; expenses for corporate administrative functions; acquisition, divestiture and integration expenses; and other nonrecurring income and expenses not attributable to operations of the Company's other operating segments.

Assets employed by segment include assets directly identified with those operations. Corporate assets consist primarily of cash, cash equivalents and restricted cash; restricted investments; property, plant and equipment for corporate operations; and other assets not directly identifiable with a reportable segment.

The following tables display selected financial data for the Company’s reportable segments. Total revenues, as presented on the consolidated statements of earnings, reflect the elimination of intersegment revenues, which represent sales from one segment to another segment. Total revenues and earnings (loss) from operations reflect continuing operations only.


years ended December 31 (in millions) Total revenues	2023		2022		2021
East Group	$	2,763.4	$	2,468.1	$	2,303.0
West Group		3,698.4		3,388.6		2,812.3
Total Building Materials business		6,461.8		5,856.7		5,115.3
Magnesia Specialties		315.4		304.0		298.7
Total	$	6,777.2	$	6,160.7	$	5,414.0


years ended December 31 (in millions) Earnings (Loss) from operations	2023			2022			2021
East Group	$	857.1		$	640.2		$	621.7
West Group		777.1			588.1			385.2
Total Building Materials business		1,634.2			1,228.3			1,006.9
Magnesia Specialties		76.0			75.2			90.8
Total reportable segments		1,710.2			1,303.5			1,097.7
Corporate		(114.2	)		(96.8	)		(123.9	)
Consolidated earnings from operations		1,596.0			1,206.7			973.8
Interest expense		165.3			169.0			142.7
Other nonoperating income, net		(62.1	)		(53.4	)		(24.4	)
Consolidated earnings from continuing operations before income tax expense	$	1,492.8		$	1,091.1		$	855.5

Earnings from operations for the West Group included a nonrecurring gain on divestiture of $151.9 million in 2022.


December 31 (in millions) Assets employed	2023		2022		2021
East Group	$	5,131.1	$	5,063.5	$	5,009.0
West Group		7,696.7		7,908.4		8,264.8
Total Building Materials business		12,827.8		12,971.9		13,273.8
Magnesia Specialties		250.0		192.1		168.7
Total reportable segments		13,077.8		13,164.0		13,442.5
Corporate		2,047.1		1,829.6		950.5
Total	$	15,124.9	$	14,993.6	$	14,393.0


years ended December 31 (in millions) Depreciation, depletion and amortization	2023		2022		2021
East Group	$	210.1	$	210.4	$	196.0
West Group		268.0		260.6		223.0
Total Building Materials business		478.1		471.0		419.0
Magnesia Specialties		12.5		12.2		12.3
Total reportable segments		490.6		483.2		431.3
Corporate		22.6		22.8		20.4
Total	$	513.2	$	506.0	$	451.7

Corporate depreciation, depletion and amortization included $5.9 million, $6.6 million and $5.2 million for the amortization of bond discount and debt issuance costs in 2023, 2022 and 2021, respectively.


years ended December 31 (in millions) Total property additions, including the impact of acquisitions	2023		2022		2021
East Group	$	230.8	$	189.1	$	372.9
West Group		341.7		302.2		1,131.6
Total Building Materials business		572.5		491.3		1,504.5
Magnesia Specialties		39.3		32.0		8.2
Total reportable segments		611.8		523.3		1,512.7
Corporate		14.4		21.1		28.8
Total	$	626.2	$	544.4	$	1,541.5


years ended December 31 (in millions) Property additions through acquisitions	2023		2022		2021
East Group	$	—	$	—	$	169.2
West Group		—		2.5		918.3
Total Building Materials business		—		2.5		1,087.5
Magnesia Specialties		—		—		—
Total reportable segments		—		2.5		1,087.5
Corporate		—		—		—
Total	$	—	$	2.5	$	1,087.5