Goodwill and Other Identifiable Intangible Assets - Detail of Identifiable Intangible Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Acquired Intangible Assets By Major Class [Line Items]
Cost	$ 1,246.2	$ 1,235.3
Accumulated amortization	(413.3)	(448.6)
Net	832.9	786.7
Cost	1,501.3	1,482.4
Net	1,088.0	1,033.8
Trade names intangibles
Acquired Intangible Assets By Major Class [Line Items]
Net, indefinite-life intangibles	255.1	247.1
Customer relationships
Acquired Intangible Assets By Major Class [Line Items]
Cost	1,163.9	1,146.5
Accumulated amortization	(373.5)	(400.2)
Net	790.4	746.3
Proprietary technology and patents
Acquired Intangible Assets By Major Class [Line Items]
Cost	82.3	88.8
Accumulated amortization	(39.8)	(48.4)
Net	$ 42.5	$ 40.4