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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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Earnings Per Share [Line Items]        
Net (loss) income attributable to Emerald Holding, Inc. $ (1.4) $ (2.8) $ 13.9 $ 8.2
Accretion to redemption value of redeemable convertible preferred stock 0.0 (2.0) 0.0 (12.7)
Net (loss) income attributable to Emerald Holding, Inc. common stockholders $ (1.4) $ (4.8) $ 13.9 $ (4.5)
Weighted average common shares outstanding 198,650 155,915 199,614 109,477
Basic (loss) income per share $ (0.01) $ (0.03) $ 0.07 $ (0.04)
Net (loss) income attributable to Emerald Holding, Inc. common stockholders $ (1.4) $ (4.8) $ 13.9 $ (4.5)
Diluted effect of stock options     475  
Diluted weighted average common shares outstanding 198,650 155,915 200,089 109,477
Diluted (loss) income per share $ (0.01) $ (0.03) $ 0.07 $ (0.04)
Anti-dilutive employee share awards excluded from diluted earnings per share calculation 9,713 7,786 16,082 7,857
Redeemable Convertible Preferred Stock [Member]        
Earnings Per Share [Line Items]        
Accretion to redemption value of redeemable convertible preferred stock   $ (2.0)   $ (12.7)