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Acquisitions - Pro Forma Information (Details) - Industrial Wood Acquisition [Member] - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]    
Net sales $ 4,454.2 $ 4,293.1
Net income 55.0 45.9
Net income attributable to controlling interests $ 44.0 $ 40.1
Net income per share (Basic) (in dollars per share) $ 0.18 $ 0.17
Net income per share (Diluted) (in dollars per share) $ 0.18 $ 0.16
Acquisition-related Costs [Member]    
Business Acquisition [Line Items]    
Net income $ 5.3  
Acquisition-related Costs, Net of Tax [Member]    
Business Acquisition [Line Items]    
Net income 3.3  
Fair Value Adjustment to Inventory [Member]    
Business Acquisition [Line Items]    
Net income $ 2.8