Nature Of Operations (Tables)

12 Months Ended

Dec. 31, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule Of Segment Reporting Information

For the year ended 2023	Mineral Fiber			Architectural Specialties		Unallocated Corporate			Total
Net sales to external customers	$	932.4		$	362.8	$	-		$	1,295.2
Equity (earnings) from joint venture		(89.3	)		-		-			(89.3	)
Segment operating income (loss)		285.7			40.9		(2.9	)		323.7
Segment assets		1,091.9			421.1		159.4			1,672.4
Depreciation and amortization		75.3			13.9		-			89.2
Investment in joint venture		17.4			-		-			17.4
Purchases of property, plant and equipment		67.2			16.6		-			83.8
For the year ended 2022	Mineral Fiber			Architectural Specialties		Unallocated Corporate			Total
Net sales to external customers	$	887.4		$	345.7	$	-		$	1,233.1
Equity (earnings) from joint venture		(77.6	)		-		-			(77.6	)
Segment operating income (loss)		260.9			21.7		(3.9	)		278.7
Segment assets		1,096.9			387.5		202.8			1,687.2
Depreciation and amortization		69.5			14.2		-			83.7
Investment in joint venture		23.9			-		-			23.9
Purchases of property, plant and equipment		63.8			11.0		-			74.8
For the year ended 2021	Mineral Fiber			Architectural Specialties		Unallocated Corporate			Total
Net sales to external customers	$	818.5		$	288.1	$	-		$	1,106.6
Equity (earnings) from joint venture		(87.7	)		-		-			(87.7	)
Segment operating income (loss)		261.2			4.2		(5.4	)		260.0
Segment assets		1,133.9			366.3		209.8			1,710.0
Depreciation and amortization		69.9			26.6		-			96.5
Investment in joint venture		50.0			-		-			50.0
Purchases of property, plant and equipment		64.8			15.0		-			79.8

Reconciliation Of Total Consolidated Operating Income To Earnings Before Income Taxes

The following reconciles our total consolidated operating income to earnings (loss) from continuing operations before income taxes. These items are only measured and managed on a consolidated basis:

	2023			2022			2021
Total consolidated operating income	$	323.7		$	278.7		$	260.0
Interest expense		35.3			27.1			22.9
Other non-operating (income), net		(9.9	)		(6.0	)		(5.6	)
Earnings from continuing operations before income taxes	$	298.3		$	257.6		$	242.7

Schedule Of Sales Allocated To Geographic Area

The sales in the table below are allocated to geographic areas based on the location of our selling entities.

	2023		2022		2021
Geographic Areas
Net sales
Mineral Fiber:
United States	$	854.2	$	816.3	$	754.2
Canada		78.2		71.1		64.3
Total Mineral Fiber		932.4		887.4		818.5
Architectural Specialties:
United States		349.3		322.1		268.0
Canada		13.5		23.6		20.1
Total Architectural Specialties		362.8		345.7		288.1
Total net sales	$	1,295.2	$	1,233.1	$	1,106.6

Schedule Of Property, Plant And Equipment Allocated To Geographic Area

	2023		2022
Property, plant and equipment, net at December 31,
Mineral Fiber:
United States	$	494.9	$	496.8
Total Mineral Fiber		494.9		496.8
Architectural Specialties:
United States		66.5		52.3
Canada		5.0		5.3
Total Architectural Specialties		71.5		57.6
Total property, plant and equipment, net	$	566.4	$	554.4