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Compass Concierge Receivables and Allowance for Credit Losses - Summary of ACL for Concierge Receivables (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning of period $ 14.2 $ 14.7
Allowances 0.3 0.5
Net write-offs and other (0.3) (1.0)
End of period $ 14.2 $ 14.2