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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
Mar. 31, 2022
Mar. 31, 2021
Numerator:    
Net loss attributable to Compass, Inc. $ (188.0) $ (212.4)
Denominator:    
Weighted-average shares used in computing net loss per share attributable to Compass, Inc., basic (in shares) 415,384,878 126,917,284
Weighted-average shares used in computing net loss per share attributable to Compass, Inc., diluted (in shares) 415,384,878 126,917,284
Net loss per share attributable to Compass, Inc., basic (in dollars per share) $ (0.45) $ (1.67)
Net loss per share attributable to Compass, Inc., diluted (in dollars per share) $ (0.45) $ (1.67)