Goodwill and Other Intangible Assets - Narrative (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Aug. 07, 2024
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 43.3	$ 40.6	$ 123.3	$ 122.5
Intangible asset impairment charges, indefinite-lived	$ 0.0	$ 0.0	$ 0.0	$ 0.0
Marketed Product Rights
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross, reclassified					$ 341.5