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Intangible Assets and Goodwill - Schedule of Changes in Carrying Amount of Goodwill for Each Reportable Segment (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Goodwill [Line Items]
Goodwill, balance	$ 553.9	$ 545.5
Acquired goodwill	19.9	8.4
Goodwill, balance	573.8	553.9
Commerce (Legacy) [Member]
Goodwill [Line Items]
Goodwill, balance		356.1
Transfers		(356.1)
Design, Creative & Technology (Legacy) [Member]
Goodwill [Line Items]
Goodwill, balance		160.8
Transfers		(160.8)
Connections [Member]
Goodwill [Line Items]
Goodwill, balance	518.3
Acquired goodwill	19.9	8.4
Transfers		509.9
Goodwill, balance	538.2	518.3
All Other Category [Member]
Goodwill [Line Items]
Goodwill, balance	35.6
Transfers		35.6
Goodwill, balance	$ 35.6	35.6
All Other (Legacy) Member
Goodwill [Line Items]
Goodwill, balance		28.6
Transfers		$ (28.6)

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