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Impairment Charges (Narrative) (Details)
3 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
business
Dec. 31, 2017
USD ($)
reporting_unit
Goodwill [Line Items]        
Impairments   $ 7,800,000 $ 5,400,000 $ 4,900,000
Goodwill impairment   0 0 $ 0
Number of reporting units tested for goodwill impairment | reporting_unit       2
Goodwill   1,406,300,000 $ 833,800,000 $ 822,200,000
Goodwill impairment, including discontinued operations, held-for-sale $ 1,300,000      
Impairment of other long-lived assets $ 3,300,000      
Work Furniture and Aerospace reporting units        
Goodwill [Line Items]        
Goodwill       $ 157,400,000
Work Furniture and Aerospace reporting units | Minimum        
Goodwill [Line Items]        
Fair values of reporting units in excess of carrying amount (as a percent) (at least)       75.00%
Drawn Wire        
Goodwill [Line Items]        
Number of businesses sold | business     1  
Residential Products and Furniture Products        
Goodwill [Line Items]        
Impairments   7,600,000    
Furniture Products        
Goodwill [Line Items]        
Impairments     $ 5,100,000 $ 0
Goodwill   $ 193,000,000.0 $ 193,100,000 $ 196,200,000