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Acquisitions (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2020
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]          
Proceeds From Sale of Buildings, Cash Received $ 15.0        
Gain on Acquisition     $ 0.0 $ 14.0 $ 0.0
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value     0.0 15.0  
Goodwill, Acquired During Period     0.0 14.0  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Equipment     3.0    
Proceeds from Sale of Buildings 17.0        
Proceeds from Sale and Collection of Notes Receivable 2.0        
Gain (Loss) on Sale of Properties     2.0    
Property, plant and equipment, net     918.0 965.0  
Inventories     259.0 265.0  
Net sales     2,788.0 2,310.0 2,828.0
East River Facility and CanExe [Member]          
Business Acquisition [Line Items]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net 14.0        
Property, plant and equipment, net 5.0        
Inventories 10.0        
CanExel siding [Member]          
Business Acquisition [Line Items]          
Net sales     14.0 46.0 37.0
Operating Segments | Other          
Business Acquisition [Line Items]          
Net sales     52.0 66.0 48.0
Operating Segments | CanExel siding [Member] | Other          
Business Acquisition [Line Items]          
Net sales     14.0 46.0 $ 37.0
Entekra [Member]          
Business Acquisition [Line Items]          
Gain on Acquisition   $ 14.0      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net   56.0      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets   41.0      
Cash Acquired from Acquisition   40.0      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment   6.0      
Acquired Intangible Assets, including Goodwill   25.0      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities   (1.0)      
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value   $ 15.0      
Siding          
Business Acquisition [Line Items]          
Goodwill, Acquired During Period $ 4.0   $ 0.0 $ 4.0