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Compass Concierge Receivables and Allowance for Credit Losses - Summary of ACL for Concierge Receivables (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($)
Accounting Policies [Abstract]
Beginning of period	$ 17.2
Allowances	1.9
Net write-offs and other	(2.2)
End of period	$ 16.9

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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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