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Goodwill and Identifiable Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended			12 Months Ended
		Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2020
Goodwill and Identifiable Intangible Assets [Line Items]
Goodwill	[1]	$ 2,466.2			$ 2,394.8
Net identifiable intangible assets		1,434.3			1,420.3
Increase in gross identifiable intangible assets		32.0
Gross Carrying Amounts, Indefinite-lived tradenames		712.2			711.0
Plumbing [Member]
Goodwill and Identifiable Intangible Assets [Line Items]
Goodwill	[1]	$ 817.3			750.1
Plumbing [Member] | COVID-19 [Member]
Goodwill and Identifiable Intangible Assets [Line Items]
Amortizable identifiable intangible assets, estimated useful life		30 years
Impairment of intangible assets, trade names			$ 13.0
Cabinets [Member]
Goodwill and Identifiable Intangible Assets [Line Items]
Goodwill	[1]	$ 926.8			926.1
Cabinets [Member] | Tradenames [Member]
Goodwill and Identifiable Intangible Assets [Line Items]
Gross Carrying Amounts, Indefinite-lived tradenames		$ 29.1
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
Maximum [Member] | Cabinets [Member] | Four Tradenames [Member]
Goodwill and Identifiable Intangible Assets [Line Items]
Estimated fair value in excess of carrying amount					30.00%
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 Outdoors & Security segment.

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Goodwill And Intangible Assets [Line Items]

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Amount of increase (decrease) in carrying value of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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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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