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Goodwill and Identifiable Intangible Assets - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2020
Goodwill and Identifiable Intangible Assets [Line Items]        
Goodwill [1]   $ 2,090.2   $ 2,081.3
Net identifiable intangible assets   1,168.9   1,118.0
Decrease in gross identifiable intangible assets       (32.3)
Gross Carrying Amounts, Indefinite-lived tradenames   635.6   $ 596.2
Tradenames and Customer Relationship [Member] | Minimum [Member]        
Goodwill and Identifiable Intangible Assets [Line Items]        
Amortizable identifiable intangible assets, estimated useful life       2 years
Tradenames and Customer Relationship [Member] | Maximum [Member]        
Goodwill and Identifiable Intangible Assets [Line Items]        
Amortizable identifiable intangible assets, estimated useful life       30 years
Plumbing and Cabinets Segments [Member]        
Goodwill and Identifiable Intangible Assets [Line Items]        
Impairment of intangible assets, trade names       $ 22.5
Plumbing [Member]        
Goodwill and Identifiable Intangible Assets [Line Items]        
Goodwill [1]   747.3   740.6
Plumbing [Member] | COVID-19 [Member]        
Goodwill and Identifiable Intangible Assets [Line Items]        
Impairment of intangible assets, trade names       $ 13.0
Amortizable identifiable intangible assets, estimated useful life       30 years
Gross Carrying Amounts, Indefinite-lived tradenames       $ 12.7
Cabinets [Member]        
Goodwill and Identifiable Intangible Assets [Line Items]        
Goodwill [1]   925.5   923.9
Cabinets [Member] | Trade Names [Member]        
Goodwill and Identifiable Intangible Assets [Line Items]        
Impairment of intangible assets, trade names   $ 12.0    
Gross Carrying Amounts, Indefinite-lived tradenames $ 29.1      
Cabinets [Member] | Second Indefinite-Lived Trade Name [Member]        
Goodwill and Identifiable Intangible Assets [Line Items]        
Impairment of intangible assets, trade names     $ 29.5  
Gross Carrying Amounts, Indefinite-lived tradenames       85.0
Cabinets [Member] | Third Indefinite-Lived Trade Name [Member]        
Goodwill and Identifiable Intangible Assets [Line Items]        
Gross Carrying Amounts, Indefinite-lived tradenames       $ 37.3
Cabinets [Member] | COVID-19 [Member] | Trade Names [Member]        
Goodwill and Identifiable Intangible Assets [Line Items]        
Impairment of intangible assets, trade names $ 9.5      
Cabinets [Member] | Maximum [Member] | Third Indefinite-Lived Trade Name [Member]        
Goodwill and Identifiable Intangible Assets [Line Items]        
Estimated fair value in excess of carrying amount 10.00%      
[1] Net of accumulated impairment losses of $399.5 million in the Doors & Security segment.