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Compass Concierge Receivables and Allowance for Credit Losses - Summary of Aging Analysis of Concierge Receivables (Detail) $ in Millions	Mar. 31, 2021 USD ($)
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	$ 21.9
Financing Receivable, Not Past Due	43.3
Financing Receivable, before Allowance for Credit Loss	65.2
Financing Receivables Overdue Up to Thirty One Days And Less Than Ninety Days [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	8.1
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	$ 13.8

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- Definition

Amount of financing receivable not past due.

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