Segment Results (Tables)

3 Months Ended

Mar. 31, 2021

Segment Reporting [Abstract]

Schedule of Net Sales

	Three Months Ended
	March 31,
	2021		2020
Net sales
Mineral Fiber	$	188.7	$	197.7
Architectural Specialties		63.2		51.0
Total net sales	$	251.9	$	248.7

Schedule of Segment Operating Income (Loss)

	Three Months Ended
	March 31,
	2021			2020
Segment operating income (loss)
Mineral Fiber	$	60.6		$	70.0
Architectural Specialties		(4.9	)		7.5
Unallocated Corporate		(1.6	)		(1.5	)
Total consolidated operating income	$	54.1		$	76.0

Reconciliation of Total Consolidated Operating Income to Earnings Before Income Taxes

The Architectural Specialties operating loss for the three months ended March 31, 2021 was driven by intangible asset amortization and other acquisition-related expenses related to our acquisitions of Turf, Moz and Arktura in 2020. See Note 4 for additional information related to our acquisitions.

	Three Months Ended
	March 31,
	2021			2020
Total consolidated operating income	$	54.1		$	76.0
Interest expense		5.7			6.7
Other non-operating (income) expense, net		(1.3	)		369.4
Earnings (loss) from continuing operations before income taxes	$	49.7		$	(300.1	)

Reconciliation of Total Segment Assets to Total Consolidated Assets

	March 31, 2021		December 31, 2020
Segment assets
Mineral Fiber	$	1,116.9	$	1,101.1
Architectural Specialties		354.5		357.7
Unallocated Corporate		243.9		259.7
Total consolidated assets	$	1,715.3	$	1,718.5