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Goodwill and Identifiable Intangible Assets - Additional Information (Detail)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
asset-group
Goodwill and Identifiable Intangible Assets [Line Items]        
Goodwill $ 2,084.9 $ 2,080.3   $ 2,084.9
Net identifiable intangible assets 1,186.1 1,246.8   1,186.1
Decrease in gross identifiable intangible assets       (28.2)
Indefinite-lived Intangible Assets (Excluding Goodwill) 645.1 673.9   $ 645.1
Customer Relationship [Member] | Minimum [Member]        
Goodwill and Identifiable Intangible Assets [Line Items]        
Amortizable identifiable intangible assets, estimated useful life       2 years
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 925.1 924.0   $ 925.1
Number of tradenames | asset-group       3
Cabinets [Member] | Trade Names [Member]        
Goodwill and Identifiable Intangible Assets [Line Items]        
Impairment of intangible assets, trade names 29.5 $ 35.5 $ 27.1 $ 29.5
Indefinite-lived Intangible Assets (Excluding Goodwill) $ 85.0   $ 174.0 $ 85.0