v3.25.4
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, 2025
Dec. 31, 2024
Dec. 31, 2023
Earnings Per Share [Line Items]      
Net (loss) income attributable to Emerald Holding, Inc. $ (30.7) $ 2.2 $ (8.2)
Accretion to redemption value of redeemable convertible preferred stock 0.0 (12.7) (42.0)
Net loss attributable to Emerald Holding, Inc. common stockholders $ (30.7) $ (10.5) $ (50.2)
Weighted average common shares outstanding 198,729 156,592 63,959
Basic loss per share $ (0.15) $ (0.07) $ (0.78)
Net loss attributable to Emerald Holding, Inc. common stockholders $ (30.7) $ (10.5) $ (50.2)
Diluted weighted average common shares outstanding 198,729 156,592 63,959
Diluted loss per share $ (0.15) $ (0.07) $ (0.78)
Anti-dilutive employee share awards excluded from diluted earnings per share calculation 9,754 10,082 19,704
Redeemable Convertible Preferred Stock [Member]      
Earnings Per Share [Line Items]      
Accretion to redemption value of redeemable convertible preferred stock $ 0.0 $ (12.7) $ (42.0)