Goodwill and Other Identifiable Intangible Assets - Detail of Identifiable Intangible Assets (Detail) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Acquired Intangible Assets By Major Class [Line Items]
Cost	$ 591.8	$ 605.1
Accumulated amortization	(353.7)	(352.2)
Net	238.1	252.9
Cost	761.5	780.2
Net	407.8	428.0
Customer relationships
Acquired Intangible Assets By Major Class [Line Items]
Cost	546.4	558.8
Accumulated amortization	(320.8)	(320.1)
Net	225.6	238.7
Proprietary technology and patents
Acquired Intangible Assets By Major Class [Line Items]
Cost	45.4	46.3
Accumulated amortization	(32.9)	(32.1)
Net	12.5	14.2
Trade names intangibles
Acquired Intangible Assets By Major Class [Line Items]
Net, indefinite-life intangibles	$ 169.7	$ 175.1