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Earnings Per Share - Computation of Basic and Diluted (Loss) Income Per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Earnings Per Share [Line Items]        
Net loss attributable to Emerald Holding, Inc. $ (14.4) $ (11.1) $ (0.5) $ (2.9)
Accretion to redemption value of redeemable convertible preferred stock 0.0 0.0 0.0 (12.7)
Net loss attributable to Emerald Holding, Inc. common stockholders $ (14.4) $ (11.1) $ (0.5) $ (15.6)
Weighted average common shares outstanding 197,950 203,893 199,053 141,179
Basic loss per share $ (0.07) $ (0.05) $ (0) $ (0.11)
Net loss attributable to Emerald Holding, Inc. common stockholders $ (14.4) $ (11.1) $ (0.5) $ (15.6)
Diluted weighted average common shares outstanding 197,950 203,893 199,053 141,179
Diluted loss per share $ (0.07) $ (0.05) $ (0) $ (0.11)
Anti-dilutive employee share awards excluded from diluted earnings per share calculation 9,646 10,210 9,649 7,717
Redeemable Convertible Preferred Stock [Member]        
Earnings Per Share [Line Items]        
Accretion to redemption value of redeemable convertible preferred stock $ 0.0 $ 0.0 $ 0.0 $ (12.7)