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Intangible Assets and Goodwill - Summary of Intangible Assets (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Schedule Of Intangible Assets Excluding Goodwill [Line Items]    
Gross carrying amount $ 616.5 $ 560.0
Accumulated amortization (425.9) (404.1)
Net carrying amount 190.6 155.9
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 394.4 363.6
Accumulated amortization (352.9) (343.5)
Net carrying amount 41.5 20.1
Trade Names [Member]    
Schedule Of Intangible Assets Excluding Goodwill [Line Items]    
Gross carrying amount 112.1 92.3
Accumulated amortization (32.5) (27.6)
Net carrying amount 79.6 64.7
Acquired Technology [Member]    
Schedule Of Intangible Assets Excluding Goodwill [Line Items]    
Gross carrying amount 8.4 8.4
Accumulated amortization (6.3) (5.7)
Net carrying amount 2.1 2.7
Acquired Content [Member]    
Schedule Of Intangible Assets Excluding Goodwill [Line Items]    
Gross carrying amount 2.6 2.6
Accumulated amortization (1.8) (1.4)
Net carrying amount 0.8 1.2
Computer Software [Member]    
Schedule Of Intangible Assets Excluding Goodwill [Line Items]    
Gross carrying amount 51.6 45.1
Accumulated amortization (32.4) (25.9)
Net carrying amount 19.2 19.2
Capitalized Software in Progress [Member]    
Schedule Of Intangible Assets Excluding Goodwill [Line Items]    
Gross carrying amount 1.7 2.3
Net carrying amount $ 1.7 $ 2.3