Revenue (Tables)

3 Months Ended

Mar. 31, 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 months ended March 31, 2019 and 2018:

	Three months ended March 31,
Mineral Fiber	2019		2018
Distributors	$	144.6	$	137.7
Home centers		23.1		24.0
Direct customers		14.1		13.7
Retailers and other		14.9		15.3
Total	$	196.7	$	190.7

Architectural Specialties [Member]

Disaggregation Of Revenue [Line Items]

Schedule of Net Sales by Major Customer Group within Each Segment

	Three months ended March 31,
Architectural Specialties	2019		2018
Distributors	$	31.5	$	28.4
Direct customers		13.1		7.9
Retailers and other		0.8		0.3
Total	$	45.4	$	36.6