Revenue (Tables)

6 Months Ended

Jun. 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 six months ended June 30, 2019 and 2018:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
Mineral Fiber	2019		2018		2019		2018
Distributors	$	161.4	$	156.7	$	306.0	$	294.4
Home centers		21.2		20.5		44.3		44.5
Direct customers		17.5		16.8		31.6		30.5
Retailers and other		14.0		12.7		28.9		28.0
Total	$	214.1	$	206.7	$	410.8	$	397.4

Architectural Specialties [Member]

Disaggregation Of Revenue [Line Items]

Schedule of Net Sales by Major Customer Group within Each Segment

	Three Months Ended				Six Months Ended
	June 30,				June 30,
Architectural Specialties	2019		2018		2019		2018
Distributors	$	37.3	$	33.4	$	68.8	$	61.8
Direct customers		19.0		7.5		32.1		15.4
Retailers and other		1.6		1.0		2.4		1.3
Total	$	57.9	$	41.9	$	103.3	$	78.5