Segment Results (Tables)

9 Months Ended

Sep. 30, 2025

Segment Reporting [Abstract]

Schedule Of Segment Reporting Information

The following tables are presented at the level of disaggregation regularly reviewed by the CODM to evaluate operating performance and allocate resources to operating segments:

For the three months ended September 30, 2025	Mineral Fiber			Architectural Specialties		Unallocated Corporate			Total
Net sales to external customers	$	274.0		$	151.2	$	-		$	425.2
Cost of goods sold		155.3			91.1		0.3			246.7
Gross profit (loss)		118.7			60.1		(0.3	)		178.5
SG&A expenses		49.1			40.7		0.3			90.1
Loss related to change in fair value of contingent consideration		-			0.1		-			0.1
(Gain) on sales of fixed assets, net		(0.9	)		-		-			(0.9	)
Equity (earnings) loss from unconsolidated affiliates, net		(28.2	)		-		0.2			(28.0	)
Segment operating income (loss)	$	98.7		$	19.3	$	(0.8	)	$	117.2
Depreciation and amortization	$	21.6		$	8.5	$	-		$	30.1
Purchases of property, plant and equipment		18.5			4.1		-			22.6

For the three months ended September 30, 2024	Mineral Fiber			Architectural Specialties			Unallocated Corporate			Total
Net sales to external customers	$	258.0		$	128.6		$	-		$	386.6
Cost of goods sold		146.5			75.5			0.5			222.5
Gross profit (loss)		111.5			53.1			(0.5	)		164.1
SG&A expenses		43.6			33.9			0.1			77.6
Loss related to change in fair value of contingent consideration		0.1			0.1			-			0.2
Loss (gain) on sales and impairment of fixed assets, net		0.3			(0.1	)		-			0.2
Equity (earnings) loss from unconsolidated affiliates, net		(25.5	)		-			0.3			(25.2	)
Segment operating income (loss)	$	93.0		$	19.2		$	(0.9	)	$	111.3
Depreciation and amortization	$	19.7		$	6.4		$	-		$	26.1
Purchases of property, plant and equipment		15.9			3.5			-			19.4

For the nine months ended September 30, 2025	Mineral Fiber			Architectural Specialties		Unallocated Corporate			Total
Net sales to external customers	$	786.1		$	446.4	$	-		$	1,232.5
Cost of goods sold		460.0			267.3		1.0			728.3
Gross profit (loss)		326.1			179.1		(1.0	)		504.2
SG&A expenses		132.3			119.0		0.8			252.1
Loss related to change in fair value of contingent consideration		0.2			0.3		-			0.5
(Gain) loss on sales of fixed assets, net		(0.9	)		0.1		-			(0.8	)
Equity (earnings) loss from unconsolidated affiliates, net		(87.1	)		-		0.6			(86.5	)
Segment operating income (loss)	$	281.6		$	59.7	$	(2.4	)	$	338.9
Depreciation and amortization	$	64.5		$	25.4	$	-		$	89.9
Purchases of property, plant and equipment		49.9			11.7		-			61.6

For the nine months ended September 30, 2024	Mineral Fiber			Architectural Specialties		Unallocated Corporate			Total
Net sales to external customers	$	747.8		$	330.2	$	-		$	1,078.0
Cost of goods sold		439.7			199.4		1.2			640.3
Gross profit (loss)		308.1			130.8		(1.2	)		437.7
SG&A expenses		132.8			89.6		0.7			223.1
Loss related to change in fair value of contingent consideration		0.5			0.1		-			0.6
Loss on sales and impairment of fixed assets, net		0.3			-		-			0.3
Equity (earnings) loss from unconsolidated affiliates, net		(79.4	)		-		0.7			(78.7	)
Segment operating income (loss)	$	253.9		$	41.1	$	(2.6	)	$	292.4
Depreciation and amortization	$	59.3		$	16.6	$	-		$	75.9
Purchases of property, plant and equipment		43.5			10.5		-			54.0

Reconciliation of Total Segment Operating Income to Earnings Before Income Taxes

The following table reconciles our total segment operating income to earnings before income taxes. These items are measured and managed only on a consolidated basis.

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2025			2024			2025			2024
Total segment operating income	$	117.2		$	111.3		$	338.9		$	292.4
Interest expense		8.2			10.5			25.3			30.6
Other non-operating (income), net		(0.5	)		(3.0	)		(1.9	)		(9.3	)
Earnings before income taxes	$	109.5		$	103.8		$	315.5		$	271.1

Reconciliation of Total Segment Assets to Total Consolidated Assets

The following tables present balance sheet information by operating segment:

As of September 30, 2025	Mineral Fiber		Architectural Specialties		Unallocated Corporate		Total
Segment assets	$	1,082.1	$	621.1	$	190.2	$	1,893.4
Investments in unconsolidated affiliates		27.3		-		4.0		31.3
As of December 31, 2024	Mineral Fiber		Architectural Specialties		Unallocated Corporate		Total
Segment assets	$	1,063.8	$	602.2	$	176.7	$	1,842.7
Investments in unconsolidated affiliates		22.6		-		4.6		27.2