Segment Results (Tables)

3 Months Ended

Mar. 31, 2020

Segment Reporting [Abstract]

Schedule of Net Sales

	Three Months Ended
	March 31,
	2020		2019
Net sales
Mineral Fiber	$	197.7	$	196.7
Architectural Specialties		51.0		45.4
Total net sales	$	248.7	$	242.1

Schedule of Segment Operating Income (Loss)

	Three Months Ended
	March 31,
	2020			2019
Segment operating income (loss)
Mineral Fiber	$	70.0		$	47.6
Architectural Specialties		7.5			9.2
Unallocated Corporate		(1.5	)		(2.1	)
Total consolidated operating income	$	76.0		$	54.7

Reconciliation of Total Consolidated Operating Income to Earnings Before Income Taxes

	Three Months Ended
	March 31,
	2020			2019
Total consolidated operating income	$	76.0		$	54.7
Interest expense		6.7			10.4
Other non-operating expense (income), net		369.4			(5.5	)
(Loss) earnings from continuing operations before income taxes	$	(300.1	)	$	49.8

Reconciliation of Total Segment Assets to Total Consolidated Assets

	March 31, 2020		December 31, 2019
Segment assets
Mineral Fiber	$	1,141.9	$	1,139.9
Architectural Specialties		161.3		161.8
Unallocated Corporate		287.1		191.6
Total consolidated assets	$	1,590.3	$	1,493.3