Summary of Organization and Significant Accounting Policies - Prior Year Reclassifications (Details) - Revision of Prior Period, Reclassification, Adjustment $ in Millions	Jan. 01, 2022 USD ($)
Reclassification [Line Items]
Reclassified other current assets to current assets held for sale	$ 1.2
Summit Materials, LLC
Reclassification [Line Items]
Reclassified other current assets to current assets held for sale	$ 1.2

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