Goodwill and Other Identifiable Intangible Assets - Detail of Identifiable Intangible Assets (Detail) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Acquired Intangible Assets By Major Class [Line Items]
Cost	$ 1,192.6	$ 1,204.6
Accumulated amortization	(374.6)	(358.9)
Net	818.0	845.7
Cost	1,443.0	1,453.5
Net	1,068.4	1,094.6
Customer relationships
Acquired Intangible Assets By Major Class [Line Items]
Cost	1,103.2	1,100.9
Accumulated amortization	(335.2)	(308.9)
Net	768.0	792.0
Other
Acquired Intangible Assets By Major Class [Line Items]
Cost	89.4	89.3
Accumulated amortization	(39.4)	(35.6)
Net	50.0	53.7
Trade names intangibles
Acquired Intangible Assets By Major Class [Line Items]
Net, indefinite-life intangibles	250.4	248.9
Other Intangible Assets
Acquired Intangible Assets By Major Class [Line Items]
Cost	0.0	14.4
Accumulated amortization	0.0	(14.4)
Net	$ 0.0	$ 0.0