Segment Results (Tables)

6 Months Ended

Jun. 30, 2018

Segment Reporting [Abstract]

Schedule of Net Sales

In connection with the announced sale of our EMEA and Pacific Rim businesses, our former EMEA and Pacific Rim segments have been excluded from our results of continuing operations and segment assets.  As a result, our operating segments are as follows:  Mineral Fiber, Architectural Specialties and Unallocated Corporate.  

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2018		2017		2018		2017
Net sales
Mineral Fiber	$	206.7	$	190.1	$	397.4	$	379.9
Architectural Specialties		41.9		35.5		78.5		65.5
Total net sales	$	248.6	$	225.6	$	475.9	$	445.4

Schedule of Segment Operating Income (Loss)

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2018			2017			2018			2017
Segment operating income (loss)
Mineral Fiber	$	59.5		$	64.1		$	103.2		$	119.6
Architectural Specialties		8.6			8.1			16.9			12.9
Unallocated Corporate		(2.1	)		(3.0	)		(4.5	)		(6.0	)
Total consolidated operating income	$	66.0		$	69.2		$	115.6		$	126.5

Reconciliation of Total Consolidated Operating Income to Earnings Before Income Taxes

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2018			2017			2018			2017
Total consolidated operating income	$	66.0		$	69.2		$	115.6		$	126.5
Interest expense		9.8			8.9			19.0			17.8
Other non-operating (income), net		(9.1	)		(8.3	)		(18.1	)		(17.2	)
Earnings from continuing operations before income taxes	$	65.3		$	68.6		$	114.7		$	125.9

Reconciliation of Total Segment Assets to Total Consolidated Assets

Segment assets	June 30, 2018		December 31, 2017
Mineral Fiber	$	1,166.5	$	1,193.5
Architectural Specialties		63.6		53.2
Unallocated Corporate		296.7		320.7
Total consolidated assets	$	1,526.8	$	1,567.4