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Acquisitions and Dispositions - Final Allocation of Purchase Price to Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Goodwill [1] $ 2,090.2 $ 2,080.3 $ 1,912.0
Fiberon [Member]      
Business Acquisition [Line Items]      
Accounts receivable 18.8    
Inventories 50.9    
Property, plant and equipment 45.7    
Goodwill 177.7    
Identifiable intangible assets 195.0    
Other assets 4.8    
Total assets 492.9    
Accounts payable 16.8    
Other liabilities and accruals 16.3    
Net assets acquired $ 459.8    
[1] Net of accumulated impairment losses of $399.5 million in the Doors & Security segment.