Goodwill and Other Identifiable Intangible Assets - Detail of Identifiable Intangible Assets (Detail) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Acquired Intangible Assets By Major Class [Line Items]
Cost	$ 1,128.5	$ 1,235.3
Accumulated amortization	(399.9)	(448.6)
Net	728.6	786.7
Cost	1,383.8	1,482.4
Net	983.9	1,033.8
Trade names intangibles
Acquired Intangible Assets By Major Class [Line Items]
Net, indefinite-life intangibles	255.3	247.1
Customer relationships
Acquired Intangible Assets By Major Class [Line Items]
Cost	1,052.4	1,146.5
Accumulated amortization	(361.6)	(400.2)
Net	690.8	746.3
Other
Acquired Intangible Assets By Major Class [Line Items]
Cost	76.1	88.8
Accumulated amortization	(38.3)	(48.4)
Net	$ 37.8	$ 40.4