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Other Intangible Assets - Schedule of Amortization Expense (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]      
Gross cost at January 1 $ 298.9 $ 294.8 $ 294.6
Other Intangible Assets, Net 75.3 113.5  
Product Rights [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross cost at January 1 6.3 10.1  
Brand Names [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross cost at January 1 2.3 2.9  
Technology [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross cost at January 1 19.8 32.6  
Customer and Distributor Relationships [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross cost at January 1 44.2 60.8  
Internally Developed Software [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross cost at January 1 $ 2.7 $ 7.1