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Goodwill and Identifiable Intangible Assets - Additional Information (Detail)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2018
USD ($)
asset-group
Sep. 30, 2018
asset-group
Jun. 30, 2019
USD ($)
asset-group
Goodwill and Identifiable Intangible Assets [Line Items]      
Goodwill [1] $ 2,080.3   $ 2,085.7
Other intangible assets, net of accumulated amortization 1,246.8   1,229.2
Increase in gross identifiable intangible assets     5.1
Indefinite-lived Intangible Assets (Excluding Goodwill) 673.9   676.2
Cabinets [Member]      
Goodwill and Identifiable Intangible Assets [Line Items]      
Goodwill [1] $ 924.0   $ 925.5
Number of tradenames | asset-group 2 2 3
Cabinets [Member] | Trade Names [Member]      
Goodwill and Identifiable Intangible Assets [Line Items]      
Indefinite-lived Intangible Assets (Excluding Goodwill) $ 203.0    
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
[1] Net of accumulated impairment losses of $399.5 million in the Doors & Security segment.