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Intangible Assets and Goodwill - Summary of Intangible Assets (Detail) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Schedule Of Intangible Assets Excluding Goodwill [Line Items]    
Gross carrying amount $ 602.3 $ 560.0
Accumulated amortization (417.8) (404.1)
Net carrying amount 184.5 155.9
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 388.8 363.6
Accumulated amortization (349.2) (343.5)
Net carrying amount 39.6 20.1
Trade Names [Member]    
Schedule Of Intangible Assets Excluding Goodwill [Line Items]    
Gross carrying amount 105.6 92.3
Accumulated amortization (30.7) (27.6)
Net carrying amount 74.9 64.7
Acquired Technology [Member]    
Schedule Of Intangible Assets Excluding Goodwill [Line Items]    
Gross carrying amount 8.4 8.4
Accumulated amortization (6.1) (5.7)
Net carrying amount 2.3 2.7
Acquired Content [Member]    
Schedule Of Intangible Assets Excluding Goodwill [Line Items]    
Gross carrying amount 2.6 2.6
Accumulated amortization (1.7) (1.4)
Net carrying amount 0.9 1.2
Computer Software [Member]    
Schedule Of Intangible Assets Excluding Goodwill [Line Items]    
Gross carrying amount 48.2 45.1
Accumulated amortization (30.1) (25.9)
Net carrying amount 18.1 19.2
Capitalized Software in Progress [Member]    
Schedule Of Intangible Assets Excluding Goodwill [Line Items]    
Gross carrying amount 3.0 2.3
Net carrying amount $ 3.0 $ 2.3