Goodwill and Identifiable Intangible Assets - Additional Information (Detail) $ in Millions		1 Months Ended	3 Months Ended			12 Months Ended
		Apr. 30, 2017 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) asset-group	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Goodwill and Identifiable Intangible Assets [Line Items]
Goodwill	[1]		$ 2,080.3			$ 2,080.3	$ 1,912.0	$ 1,833.8
Other intangible assets, net of accumulated amortization			1,246.8			1,246.8	1,162.4
Expected intangible amortization expense in 2019			43.0			43.0
Expected intangible amortization expense in 2020			42.0			42.0
Expected intangible amortization expense in 2021			42.0			42.0
Expected intangible amortization expense in 2022			40.0			40.0
Expected intangible amortization expense in 2023			39.0			39.0
Asset Impairment Charges		$ 3.2			$ 3.2	62.6	3.2
Indefinite-lived Intangible Assets (Excluding Goodwill)			673.9			673.9	709.9
Trade Names [Member]
Goodwill and Identifiable Intangible Assets [Line Items]
Indefinite-lived Intangible Assets (Excluding Goodwill)			152.0			152.0
Indefinite-lived Intangible Assets [Member] | Trade Names [Member]
Goodwill and Identifiable Intangible Assets [Line Items]
Asset Impairment Charges			35.5	$ 27.1		62.6
Fiberon & Victoria plus Albert [Member]
Goodwill and Identifiable Intangible Assets [Line Items]
Goodwill increase (decrease) due to acquisition-related						168.3
Cabinets [Member]
Goodwill and Identifiable Intangible Assets [Line Items]
Goodwill	[1]		924.0			924.0	926.3	924.3
Impairment of intangible assets, trade names						$ 62.6
Number of tradenames, with the fair value exceeded their carrying value | asset-group						2
Doors & Security [Member]
Goodwill and Identifiable Intangible Assets [Line Items]
Goodwill	[1]		$ 412.6			$ 412.6	$ 240.5	$ 239.3
Increase in gross identifiable intangible assets						$ 117.9
Tradenames and Customer Relationship [Member] | Maximum [Member]
Goodwill and Identifiable Intangible Assets [Line Items]
Amortizable identifiable intangible assets, estimated useful life						30 years
Tradenames and Customer Relationship [Member] | Minimum [Member]
Goodwill and Identifiable Intangible Assets [Line Items]
Amortizable identifiable intangible assets, estimated useful life						2 years

[1] Net of accumulated impairment losses of $399.5 million in the Doors & Security segment.