Other Intangible Assets - Schedule of Amortization Expense (Detail) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross cost at January 1	$ 293.9	$ 294.8
Other Intangible Assets, Net	107.1	113.5
Product Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross cost at January 1	9.1	10.1
Brand Names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross cost at January 1	2.7	2.9
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross cost at January 1	31.7	32.6
Customer and Distributor Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross cost at January 1	57.7	60.8
Internally Developed Software [Member]
Finite-Lived Intangible Assets [Line Items]
Gross cost at January 1	$ 5.9	$ 7.1

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
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