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Acquisitions (Narrative) (Details)
$ in Millions
6 Months Ended
Jun. 30, 2017
USD ($)
acquisition
Jun. 30, 2016
USD ($)
acquisition
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]      
Contingent consideration, liability $ 16.6   $ 14.5
Contingent consideration, long-term liability 7.4   12.1
Contingent consideration, short-term liability 9.2   2.4
Goodwill 816.3   $ 791.3
Purchase price $ 2.6 $ 35.2  
Series of Individually Immaterial Business Acquisitions      
Business Acquisition [Line Items]      
Number of Acquisitions | acquisition 2    
Business Combination, Consideration Transferred $ 40.9    
Goodwill $ 13.1 $ 3.8  
Asian Joint Venture      
Business Acquisition [Line Items]      
Percentage of voting interest acquired 20.00%    
Purchase price $ 2.6    
Specialized Products | Fabricated Tubing and Pipe Assemblies      
Business Acquisition [Line Items]      
Number of Acquisitions | acquisition   1  
Residential Products and Furniture Products | Distributor and Installer of Geosynthetic Products and Surface-critical Bent Tube Components      
Business Acquisition [Line Items]      
Number of Acquisitions | acquisition 2    
Goodwill $ 13.1    
Residential Products | Distributor and Installer of Geosynthetic Products and Surface-critical Bent Tube Components      
Business Acquisition [Line Items]      
Goodwill 8.1    
Furniture Products | Distributor and Installer of Geosynthetic Products and Surface-critical Bent Tube Components      
Business Acquisition [Line Items]      
Goodwill $ 5.0