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Goodwill and Identifiable Intangible Assets - Additional Information (Detail) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2016
Dec. 31, 2015
May 31, 2015
Goodwill [Line Items]      
Goodwill [1] $ 1,835.0 $ 1,755.3  
Other intangible assets, net of accumulated amortization 1,113.9 996.7  
Plumbing [Member]      
Goodwill [Line Items]      
Goodwill [1] 670.0 $ 578.6  
Increase in gross identifiable intangible assets due to acquisition 140.7    
Norcraft Companies, Inc [Member]      
Goodwill [Line Items]      
Goodwill     $ 290.6
Norcraft Companies, Inc [Member] | Plumbing [Member]      
Goodwill [Line Items]      
Goodwill increase (decrease) due to acquisition-related $ 79.7    
Minimum [Member] | Tradenames and Customer Relationship [Member]      
Goodwill [Line Items]      
Amortizable identifiable intangible assets, estimated useful life 3 years    
Maximum [Member] | Tradenames and Customer Relationship [Member]      
Goodwill [Line Items]      
Amortizable identifiable intangible assets, estimated useful life 30 years    
[1] Net of accumulated impairment losses of $399.5 million in the Doors segment.