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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 9 Months Ended
Sep. 30, 2024
Sep. 30, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning of period $ 11.1 $ 13.2
Allowances 0.1 0.3
Net write-offs (0.8) (3.1)
End of period $ 10.4 $ 10.4