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Net Loss Per Share Attributable to Compass, Inc. - Schedule of Computation of Basic and Diluted Net Loss Per Share Attributable to Common Stockholders (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Numerator:        
Net loss attributable to Compass, Inc. $ (1.7) $ (39.4) $ (113.9) $ (237.6)
Denominator:        
Weighted-average shares used in computing net loss per share attributable to Compass, Inc., basic (in shares) 505,993,014 470,945,736 498,247,783 460,730,792
Weighted-average shares used to compute net loss per share attributable to Compass, Inc., diluted (in shares) 505,993,014 470,945,736 498,247,783 460,730,792
Net loss per share attributable to Compass, Inc., basic (in dollars per share) $ 0.00 $ (0.08) $ (0.23) $ (0.52)
Net loss per share attributable to Compass, Inc., diluted (in dollars per share) $ 0.00 $ (0.08) $ (0.23) $ (0.52)