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Acquisitions and Dispositions - Preliminary Allocation of Purchase Price to Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]    
Goodwill [1] $ 2,084.0 $ 2,080.3
Fiberon [Member]    
Business Acquisition [Line Items]    
Accounts receivable 19.0  
Inventories 49.9  
Property, plant and equipment 48.5  
Goodwill 173.7  
Identifiable intangible assets 195.0  
Other assets 4.8  
Total assets 490.9  
Accounts payable 16.6  
Other liabilities and accruals 14.5  
Net assets acquired $ 459.8  
[1] Net of accumulated impairment losses of $399.5 million in the Doors & Security segment.