Segment Results (Tables)

3 Months Ended

Mar. 31, 2019

Segment Reporting [Abstract]

Schedule of Net Sales

	Three Months Ended
	March 31,
	2019		2018
Net sales
Mineral Fiber	$	196.7	$	190.7
Architectural Specialties		45.4		36.6
Total net sales	$	242.1	$	227.3

Schedule of Segment Operating Income (Loss)

	Three Months Ended
	March 31,
	2019			2018
Segment operating income (loss)
Mineral Fiber	$	47.6		$	43.7
Architectural Specialties		9.2			8.3
Unallocated Corporate		(2.1	)		(2.4	)
Total consolidated operating income	$	54.7		$	49.6

Reconciliation of Total Consolidated Operating Income to Earnings Before Income Taxes

	Three Months Ended
	March 31,
	2019			2018
Total consolidated operating income	$	54.7		$	49.6
Interest expense		10.4			9.2
Other non-operating (income), net		(5.5	)		(9.0	)
Earnings from continuing operations before income taxes	$	49.8		$	49.4

Reconciliation of Total Segment Assets to Total Consolidated Assets

	March 31, 2019		December 31, 2018
Segment assets
Mineral Fiber	$	1,118.0	$	1,096.1
Architectural Specialties		147.2		84.7
Unallocated Corporate		368.5		413.2
Total consolidated assets	$	1,633.7	$	1,594.0