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Goodwill and Identifiable Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended				9 Months Ended
		Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Sep. 30, 2020
Goodwill and Identifiable Intangible Assets [Line Items]
Goodwill	[1]			$ 2,090.2		$ 2,085.2
Net identifiable intangible assets				1,168.9		1,111.2
Decrease in gross identifiable intangible assets						(27.1)
Gross Carrying Amounts, Indefinite-lived tradenames				635.6		$ 597.5
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		$ 743.4
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		$ 924.7
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						$ 38.2
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.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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