Revenue (Tables)

9 Months Ended

Sep. 30, 2019

Mineral Fiber [Member]

Disaggregation Of Revenue [Line Items]

Schedule of Net Sales by Major Customer Group within Each Segment

The following tables provide net sales by major customer group within the Mineral Fiber and Architectural Specialties segments for the three and nine months ended September 30, 2019 and 2018:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
Mineral Fiber	2019		2018		2019		2018
Distributors	$	168.0	$	164.8	$	474.0	$	459.2
Home centers		20.0		18.1		64.3		62.6
Direct customers		15.8		15.5		47.4		46.0
Retailers and other		14.8		14.4		43.7		42.4
Total	$	218.6	$	212.8	$	629.4	$	610.2

Architectural Specialties [Member]

Disaggregation Of Revenue [Line Items]

Schedule of Net Sales by Major Customer Group within Each Segment

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
Architectural Specialties	2019		2018		2019		2018
Distributors	$	39.7	$	34.3	$	108.5	$	96.1
Direct customers		16.7		10.8		48.8		26.2
Retailers and other		2.1		2.6		4.5		3.9
Total	$	58.5	$	47.7	$	161.8	$	126.2