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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
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Earnings Per Share [Line Items]      
Net income (loss) and comprehensive income (loss) attributable to Emerald Holding, Inc. $ 2.2 $ (8.2) $ 130.8
Accretion to redemption value of redeemable convertible preferred stock (12.7) (42.0) (38.8)
Participation rights on if-converted basis     (60.2)
Net (loss) income and comprehensive (loss) income attributable to Emerald Holding, Inc. common stockholders $ (10.5) $ (50.2) $ 31.8
Weighted average common shares outstanding 156,592 63,959 69,002
Basic (loss) income per share $ (0.07) $ (0.78) $ 0.46
Net (loss) income and comprehensive (loss) income attributable to Emerald Holding, Inc. common stockholders $ (10.5) $ (50.2) $ 31.8
Diluted effect of stock options     146
Diluted weighted average common shares outstanding 156,592 63,959 69,148
Diluted (loss) income per share $ (0.07) $ (0.78) $ 0.46
Anti-dilutive employee share awards excluded from diluted earnings per share calculation 10,082 19,704 14,858
Redeemable Convertible Preferred Stock [Member]      
Earnings Per Share [Line Items]      
Accretion to redemption value of redeemable convertible preferred stock $ (12.7) $ (42.0) $ (38.8)