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Acquisitions (Purchase Price Allocations Related To Acquisitions) (Details)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2016
USD ($)
Feb. 29, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
acquisition
Jun. 30, 2015
USD ($)
acquisition
Dec. 31, 2015
USD ($)
Business Acquisition [Line Items]            
Goodwill       $ 800.1   $ 806.1
Percentage of voting interest acquired     70.00%   70.00%  
Percentage of voting interest remaining that is expected to be acquired     30.00%   30.00%  
Purchase price       $ 35.2 $ 0.0  
Fabricated tubing and pipe assemblies | Specialized Products            
Business Acquisition [Line Items]            
Number of Acquisitions | acquisition       1    
Upholstered office furniture | Commercial Products            
Business Acquisition [Line Items]            
Number of Acquisitions | acquisition         1  
US Fabricated Tubing Business            
Business Acquisition [Line Items]            
Percentage of voting interest acquired   100.00%        
Purchase price   $ 16.5        
Goodwill acquired   $ 3.8        
European Private-Label Manufacturer            
Business Acquisition [Line Items]            
Purchase price     $ 0.0      
Contingent consideration, long-term liability     $ 12.0   $ 12.0  
Asian Joint Venture            
Business Acquisition [Line Items]            
Percentage of voting interest acquired 30.00%          
Purchase price $ 35.2