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Compass Concierge Receivables and Allowance for Credit Losses - Summary of Activity of The ACL For concierge receivables (Detail) - Concierge Receivables [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning of period	$ 17.2	$ 4.7
Adoption of ASU 2016-03	0.0	5.6
Allowances	7.2	9.1
Net write-offs and other	(7.1)	(2.2)
End of period	$ 17.3	$ 17.2

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Amount of writeoff of financing receivable, charged against allowance for credit loss.

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Amount of credit loss expense (reversal of expense) for financing receivable.

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