Compass Concierge Receivables and Allowance for Credit Losses - Schedule of Aging Analysis of Concierge Receivables (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Concierge receivables	$ 37.2	$ 57.6
Current
Financing Receivable, Past Due [Line Items]
Concierge receivables	28.4	50.6
31-90 days
Financing Receivable, Past Due [Line Items]
Concierge receivables	0.9	1.8
Over 90 days
Financing Receivable, Past Due [Line Items]
Concierge receivables	$ 7.9	$ 5.2

Amortized cost, before allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

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