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Other Intangible Assets - Schedule of Amortization Expense (Detail) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]    
Gross cost at January 1 $ 296.8 $ 294.8
Other Intangible Assets, Net 78.6 113.5
Product Rights [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross cost at January 1 7.2 10.1
Brand Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross cost at January 1 2.5 2.9
Technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross cost at January 1 20.3 32.6
Customer and Distributor Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross cost at January 1 45.1 60.8
Internally Developed Software [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross cost at January 1 $ 3.5 $ 7.1