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Schedule I - Condensed Financial Information of Registrant Condensed Statements of (Loss) Income and Comprehensive (Loss) Income (Detail) - USD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2024
Oct. 31, 2023
Oct. 31, 2022
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Condensed Income Statements Captions [Line Items]            
Revenues       $ 398.8 $ 382.8 $ 325.9
Selling, general and administrative expense       170.4 168.3 145.0
Depreciation and amortization expense       28.3 45.0 59.5
Goodwill impairment charge $ 0.0 $ 0.0 $ 0.0 0.0 0.0 6.3
Intangible asset impairment charge       7.3 0.0 1.6
Operating income       46.8 34.7 179.8
Interest expense       47.8 43.3 24.5
Interest income       8.5 8.2 2.7
Loss on disposal of fixed assets       0.0 (0.2) 0.0
Income (loss) before income taxes       7.5 (2.9) 158.0
Provision for income taxes       5.3 5.3 27.2
Accretion to redemption value of redeemable convertible preferred stock       (12.7) (42.0) (38.8)
Participation rights on if-converted basis       0.0 0.0 (60.2)
Net income (loss) and comprehensive income (loss) attributable to Emerald Holding, Inc.       2.2 (8.2) 130.8
Parent Company [Member]            
Condensed Income Statements Captions [Line Items]            
Equity in net income (losses) and comprehensive income (losses) of subsidiaries       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 income (loss) and comprehensive income (loss) attributable to Emerald Holding, Inc.       $ (10.5) $ (50.2) $ 31.8