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Goodwill and Other Identifiable Intangible Assets - Detail of Identifiable Intangible Assets (Detail) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Acquired Intangible Assets By Major Class [Line Items] |  |
Cost | $ 1,152.9 | $ 1,235.3
Accumulated amortization | (380.0) | (448.6)
Net | 772.9 | 786.7
Cost | 1,402.5 | 1,482.4
Net | 1,022.5 | 1,033.8
Customer relationships |  |
Acquired Intangible Assets By Major Class [Line Items] |  |
Cost | 1,077.7 | 1,146.5
Accumulated amortization | (343.9) | (400.2)
Net | 733.8 | 746.3
Other |  |
Acquired Intangible Assets By Major Class [Line Items] |  |
Cost | 75.2 | 88.8
Accumulated amortization | (36.1) | (48.4)
Net | 39.1 | 40.4
Trade names intangibles |  |
Acquired Intangible Assets By Major Class [Line Items] |  |
Net, indefinite-life intangibles | $ 249.6 | $ 247.1

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