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Intangible Assets and Goodwill - Summary of Intangible Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Schedule Of Intangible Assets Excluding Goodwill [Line Items]    
Gross carrying amount $ 560.0 $ 558.6
Accumulated amortization (404.1) (383.5)
Net carrying amount 155.9 175.1
Trade Names [Member]    
Schedule Of Intangible Assets Excluding Goodwill [Line Items]    
Gross carrying amount 45.7 52.6
Net carrying amount 45.7 52.6
Customer Relationship Intangibles [Member]    
Schedule Of Intangible Assets Excluding Goodwill [Line Items]    
Gross carrying amount 363.6 365.4
Accumulated amortization (343.5) (336.7)
Net carrying amount 20.1 28.7
Trade Names [Member]    
Schedule Of Intangible Assets Excluding Goodwill [Line Items]    
Gross carrying amount 92.3 91.1
Accumulated amortization (27.6) (22.6)
Net carrying amount 64.7 68.5
Acquired Technology [Member]    
Schedule Of Intangible Assets Excluding Goodwill [Line Items]    
Gross carrying amount 8.4 8.4
Accumulated amortization (5.7) (4.7)
Net carrying amount 2.7 3.7
Acquired Content [Member]    
Schedule Of Intangible Assets Excluding Goodwill [Line Items]    
Gross carrying amount 2.6 2.6
Accumulated amortization (1.4) (1.0)
Net carrying amount 1.2 1.6
Computer Software [Member]    
Schedule Of Intangible Assets Excluding Goodwill [Line Items]    
Gross carrying amount 45.1 36.9
Accumulated amortization (25.9) (18.5)
Net carrying amount 19.2 18.4
Capitalized Software in Progress [Member]    
Schedule Of Intangible Assets Excluding Goodwill [Line Items]    
Gross carrying amount 2.3 1.6
Net carrying amount $ 2.3 $ 1.6