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Goodwill and Identifiable Intangible Assets - Additional Information (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
asset_group
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Goodwill [Line Items]      
Goodwill [1] $ 1,912.0 $ 1,833.8 $ 1,755.3
Other intangible assets, net of accumulated amortization 1,162.4 1,107.0  
Expected intangible amortization expense in 2018 33.0    
Expected intangible amortization expense in 2019 30.0    
Expected intangible amortization expense in 2020 30.0    
Expected intangible amortization expense in 2021 30.0    
Expected intangible amortization expense in 2022 29.0    
Asset impairment charge 0.0 0.0 0.0
Carrying value of tradenames 709.9 671.8  
Plumbing [Member]      
Goodwill [Line Items]      
Goodwill [1] 745.2 670.2 578.6
Increase in gross identifiable intangible assets 88.2    
Cabinets [Member]      
Goodwill [Line Items]      
Goodwill [1] $ 926.3 $ 924.3 $ 937.7
Number of tradenames, with the fair value exceeded their carrying value | asset_group 2    
Carrying value of tradenames $ 217.8    
Victoria Plus Albert and Shaws [Member]      
Goodwill [Line Items]      
Goodwill increase (decrease) due to acquisition-related $ 78.2    
Minimum [Member] | Tradenames and Customer Relationship [Member]      
Goodwill [Line Items]      
Amortizable identifiable intangible assets, estimated useful life 2 years    
Maximum [Member] | Cabinets [Member] | Tradenames [Member]      
Goodwill [Line Items]      
Percentage of fair value of reporting unit in excess of carrying amount 10.00%    
Maximum [Member] | Tradenames and Customer Relationship [Member]      
Goodwill [Line Items]      
Amortizable identifiable intangible assets, estimated useful life 20 years    
[1] Net of accumulated impairment losses of $399.5 million in the Doors segment.