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Intangible Assets and Goodwill - Summary of Intangible Assets (Detail) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Schedule Of Intangible Assets Excluding Goodwill [Line Items]    
Gross carrying amount $ 566.2 $ 560.0
Accumulated amortization (410.3) (404.1)
Net carrying amount 155.9 155.9
Trade Names [Member]    
Schedule Of Intangible Assets Excluding Goodwill [Line Items]    
Gross carrying amount 45.7 45.7
Net carrying amount 45.7 45.7
Customer Relationship Intangibles [Member]    
Schedule Of Intangible Assets Excluding Goodwill [Line Items]    
Gross carrying amount 365.5 363.6
Accumulated amortization (345.9) (343.5)
Net carrying amount 19.6 20.1
Trade Names [Member]    
Schedule Of Intangible Assets Excluding Goodwill [Line Items]    
Gross carrying amount 94.7 92.3
Accumulated amortization (29.0) (27.6)
Net carrying amount 65.7 64.7
Acquired Technology [Member]    
Schedule Of Intangible Assets Excluding Goodwill [Line Items]    
Gross carrying amount 8.4 8.4
Accumulated amortization (5.9) (5.7)
Net carrying amount 2.5 2.7
Acquired Content [Member]    
Schedule Of Intangible Assets Excluding Goodwill [Line Items]    
Gross carrying amount 2.6 2.6
Accumulated amortization (1.5) (1.4)
Net carrying amount 1.1 1.2
Computer Software [Member]    
Schedule Of Intangible Assets Excluding Goodwill [Line Items]    
Gross carrying amount 46.8 45.1
Accumulated amortization (28.0) (25.9)
Net carrying amount 18.8 19.2
Capitalized Software in Progress [Member]    
Schedule Of Intangible Assets Excluding Goodwill [Line Items]    
Gross carrying amount 2.5 2.3
Net carrying amount $ 2.5 $ 2.3