Goodwill and Other Identifiable Intangible Assets - Detail of Identifiable Intangible Assets (Detail) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Acquired Intangible Assets By Major Class [Line Items]
Cost	$ 1,192.2	$ 1,204.6
Accumulated amortization	(360.3)	(358.9)
Net	831.9	845.7
Cost	1,442.2	1,453.5
Net	1,081.9	1,094.6
Customer relationships
Acquired Intangible Assets By Major Class [Line Items]
Cost	1,102.8	1,100.9
Accumulated amortization	(322.7)	(308.9)
Net	780.1	792.0
Other
Acquired Intangible Assets By Major Class [Line Items]
Cost	89.4	89.3
Accumulated amortization	(37.6)	(35.6)
Net	51.8	53.7
Trade names intangibles
Acquired Intangible Assets By Major Class [Line Items]
Net, indefinite-life intangibles	$ 250.0	248.9
Other Intangible Assets
Acquired Intangible Assets By Major Class [Line Items]
Cost		14.4
Accumulated amortization		(14.4)
Net		$ 0.0