Revenue (Tables)

12 Months Ended

Dec. 31, 2021

Mineral Fiber [Member]

Disaggregation Of Revenue [Line Items]

Schedule of Net Sales by Major Customer Group within Each Segment

The following tables present net sales by major customer group within the Mineral Fiber and Architectural Specialties segments for the years ended December 31, 2021, 2020 and 2019:

Mineral Fiber	2021		2020		2019
Distributors	$	603.9	$	525.2	$	622.9
Home centers		94.4		96.1		85.2
Direct customers		59.2		54.3		61.2
Retailers and other		61.0		50.4		57.3
Total	$	818.5	$	726.0	$	826.6

Architectural Specialties [Member]

Disaggregation Of Revenue [Line Items]

Schedule of Net Sales by Major Customer Group within Each Segment

Architectural Specialties	2021		2020		2019
Distributors	$	150.5	$	135.5	$	138.3
Direct customers		134.6		73.3		68.0
Retailers and other		3.0		2.1		5.2
Total	$	288.1	$	210.9	$	211.5