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Goodwill and Identifiable Intangible Assets - Additional Information (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
Tradename
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Goodwill and Identifiable Intangible Assets [Line Items]      
Goodwill $ 2,079.3 $ 2,090.2  
Net identifiable intangible assets 1,139.9 1,168.9  
Decrease in gross identifiable intangible assets (22.1)    
Gross Carrying Amounts, Indefinite-lived tradenames $ 620.8 635.6  
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    
Cabinets [Member]      
Goodwill and Identifiable Intangible Assets [Line Items]      
Goodwill $ 923.0 925.5  
Impairment of intangible assets, trade names $ 9.5    
Number of indefinite-lived tradenames | Tradename 3    
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] | Trade Names [Member] | COVID-19 [Member]      
Goodwill and Identifiable Intangible Assets [Line Items]      
Impairment of intangible assets, trade names 9.5    
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 $ 36.2    
Cabinets [Member] | Maximum [Member] | Second Indefinite-Lived Trade Name [Member]      
Goodwill and Identifiable Intangible Assets [Line Items]      
Estimated fair value in excess of carrying amount 10.00%    
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%