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Acquisitions (Narrative) (Details) - USD ($)
$ in Millions
Mar. 04, 2019
Aug. 16, 2018
May 31, 2018
Sep. 30, 2019
Dec. 31, 2018
Business Acquisition [Line Items]          
Business acquisition, goodwill       $ 42.6 $ 19.2
Architectural Components Group, Inc. [Member]          
Business Acquisition [Line Items]          
Business acquisition, purchase price $ 43.4        
Business acquisition, total fair value of tangible assets acquired, less liabilities assumed 8.3        
Business acquisition, total fair value of intangible assets acquired 12.0        
Business acquisition, goodwill 23.1        
Architectural Components Group, Inc. [Member] | Customer Relationships [Member]          
Business Acquisition [Line Items]          
Business acquisition, total fair value of intangible assets acquired 7.4        
Architectural Components Group, Inc. [Member] | TradeNames [Member]          
Business Acquisition [Line Items]          
Business acquisition, total fair value of intangible assets acquired $ 2.8        
Steel Ceilings, Inc. [Member]          
Business Acquisition [Line Items]          
Business acquisition, purchase price   $ 12.3      
Business acquisition, total fair value of tangible assets acquired, less liabilities assumed   4.4      
Business acquisition, goodwill   3.2      
Proceed from sale of acquired product   2.0      
Steel Ceilings, Inc. [Member] | Customer Relationships [Member]          
Business Acquisition [Line Items]          
Business acquisition, total fair value of intangible assets acquired   1.4      
Steel Ceilings, Inc. [Member] | TradeNames [Member]          
Business Acquisition [Line Items]          
Business acquisition, total fair value of intangible assets acquired   $ 1.3      
Plasterform, Inc. [Member]          
Business Acquisition [Line Items]          
Business acquisition, purchase price     $ 11.9    
Business acquisition, total fair value of tangible assets acquired, less liabilities assumed     2.2    
Business acquisition, total fair value of intangible assets acquired     4.8    
Business acquisition, goodwill     $ 4.9