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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 ($)
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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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