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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

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