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Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Finite Lived Intangible Assets [Line Items]
Amortization Expenses	$ 80.6	$ 5.6	$ 169.3	$ 11.3
Held-for-sale Assets
Finite Lived Intangible Assets [Line Items]
Reclassification of intangible assets	0.5		0.5
BMC Merger and John’s Lumber Acquisition
Finite Lived Intangible Assets [Line Items]
Intangible assets in connection with acquisition	1,472.6		$ 1,472.6
Weighted average useful lives of the acquired intangible assets			11 years 3 months 18 days
BMC Merger and John’s Lumber Acquisition | Customer Relationships
Finite Lived Intangible Assets [Line Items]
Intangible assets in connection with acquisition	1,339.3		$ 1,339.3
Weighted average useful lives of the acquired intangible assets			11 years 4 months 24 days
BMC Merger and John’s Lumber Acquisition | Trade Names
Finite Lived Intangible Assets [Line Items]
Intangible assets in connection with acquisition	$ 133.3		$ 133.3
Weighted average useful lives of the acquired intangible assets			5 years 6 months

X

- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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Amount classified as intangible assets, excluding goodwill, attributable to disposal group held for sale or disposed of.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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