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Other Intangible Assets - Schedule of Amortization Expense (Detail) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Gross cost at January 1 $ 297.4 $ 298.9
Other Intangible Assets, Net 66.4 75.3
Product Rights [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross cost at January 1 4.4 6.3
Brand Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross cost at January 1 2.0 2.3
Technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross cost at January 1 18.6 19.8
Customer and Distributor Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross cost at January 1 39.4 44.2
Internally Developed Software [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross cost at January 1 $ 2.0 $ 2.7