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Goodwill and Identifiable Intangible Assets - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2020
Goodwill and Identifiable Intangible Assets [Line Items]              
Goodwill [1]     $ 2,090.2   $ 2,080.3   $ 2,394.8
Other intangible assets, net of accumulated amortization     1,168.9       1,420.3
Increase in gross identifiable intangible assets             295.1
Expected intangible amortization expense in 2021             60.0
Expected intangible amortization expense in 2022             59.0
Expected intangible amortization expense in 2023             58.0
Expected intangible amortization expense in 2024             57.0
Expected intangible amortization expense in 2025             57.0
Gross Carrying Amounts, Indefinite-lived tradenames     635.6       $ 711.0
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   743.7   $ 750.1
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
Cabinets [Member]              
Goodwill and Identifiable Intangible Assets [Line Items]              
Goodwill [1]     925.5   924.0   $ 926.1
Cabinets [Member] | Tradenames [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 $ 35.5    
Gross Carrying Amounts, Indefinite-lived tradenames             85.0
Cabinets [Member] | Third Indefinite Lived-Trade Name [Member]              
Goodwill and Identifiable Intangible Assets [Line Items]              
Impairment of intangible assets, trade names           $ 27.1  
Gross Carrying Amounts, Indefinite-lived tradenames             39.8
Cabinets [Member] | Four Tradenames [Member]              
Goodwill and Identifiable Intangible Assets [Line Items]              
Gross Carrying Amounts, Indefinite-lived tradenames             $ 180.6
Cabinets [Member] | COVID-19 [Member] | Tradenames [Member]              
Goodwill and Identifiable Intangible Assets [Line Items]              
Impairment of intangible assets, trade names   $ 9.5          
Cabinets [Member] | Maximum [Member] | Four Tradenames [Member]              
Goodwill and Identifiable Intangible Assets [Line Items]              
Estimated fair value in excess of carrying amount             30.00%
[1] Net of accumulated impairment losses of $399.5 million in the Outdoors & Security segment.