Nature Of Operations (Tables)

12 Months Ended

Dec. 31, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Schedule Of Segment Reporting Information

For the year ended 2019	Mineral Fiber			Architectural Specialties		Unallocated Corporate			Total
Net sales to external customers	$	826.6		$	211.5	$	-		$	1,038.1
Equity (earnings) from joint venture		(96.6	)		-		-			(96.6	)
Segment operating income (loss)		289.6			35.9		(8.1	)		317.4
Segment assets		1,139.9			161.8		191.6			1,493.3
Depreciation and amortization		62.9			8.8		0.4			72.1
Investment in joint venture		58.5			-		-			58.5
Purchases of property, plant and equipment ⁽¹⁾		59.5			8.8		-			68.3

For the year ended 2018	Mineral Fiber			Architectural Specialties		Unallocated Corporate			Total
Net sales to external customers	$	801.6		$	173.7	$	-		$	975.3
Equity (earnings) from joint venture		(74.9	)		-		-			(74.9	)
Segment operating income (loss)		223.8			34.3		(8.7	)		249.4
Segment assets		1,096.1			84.7		413.2			1,594.0
Depreciation and amortization		75.3			3.5		0.6			79.4
Investment in joint venture		40.8			-		-			40.8
Purchases of property, plant and equipment ⁽¹⁾		60.5			4.1		-			64.6

For the year ended 2017	Mineral Fiber			Architectural Specialties		Unallocated Corporate			Total
Net sales to external customers	$	756.4		$	137.2	$	-		$	893.6
Equity (earnings) from joint venture		(67.0	)		-		-			(67.0	)
Segment operating income (loss)		233.5			27.7		(17.4	)		243.8
Segment assets		1,193.5			53.2		320.7			1,567.4
Depreciation and amortization⁽¹⁾		59.2			1.8		6.0			67.0
Investment in joint venture		107.3			-		-			107.3
Purchases of property, plant and equipment ⁽¹⁾		76.1			1.6		-			77.7

⁽¹⁾

Totals will differ from the totals on our Consolidated Statement of Cash Flows by the amounts that have been classified as discontinued operations. See Note 6 for additional details.

Reconciliation Of Total Consolidated Operating Income To Earnings Before Income Taxes

	2019			2018			2017
Total consolidated operating income	$	317.4		$	249.4		$	243.8
Interest expense		38.4			39.2			35.4
Other non-operating (income), net		(20.4	)		(32.5	)		(13.7	)
Earnings from continuing operations before income taxes	$	299.4		$	242.7		$	222.1

Schedule Of Sales Allocated To Geographic Area

	2019		2018		2017
Geographic Areas
Net trade sales
Mineral Fiber:
United States and Latin America	$	769.0	$	739.2	$	699.8
Canada		57.6		62.4		56.6
Total Mineral Fiber		826.6		801.6		756.4

Architectural Specialties:
United States and Latin America		192.3		157.5		129.5
Canada		19.2		16.2		7.7
Total Architectural Specialties		211.5		173.7		137.2
Total net trade sales	$	1,038.1	$	975.3	$	893.6

Schedule Of Property, Plant And Equipment Allocated To Geographic Area

	2019		2018
Property, plant and equipment, net at December 31,
Mineral Fiber:
United States	$	496.6	$	487.5
Total Mineral Fiber		496.6		487.5

Architectural Specialties:
United States	$	22.2	$	5.9
Canada		5.8		4.5
Total Architectural Specialties		28.0		10.4

Unallocated Corporate ⁽¹⁾		-		3.1
Total property, plant and equipment, net	$	524.6	$	501.0

⁽¹⁾

Includes property, plant and equipment located in China that were formerly reported in our Pacific Rim segment that were not included in the Sale. As of December 31, 2019, the property, plant and equipment located in China are classified as an asset held for sale, as we entered into a sale agreement during the third quarter of 2019 with closing expected in the second quarter of 2020.