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Other Intangible Assets - Schedule of Category of Other Intangible Assets (Detail) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Other Intangible Assets, Net $ 61.9 $ 75.3
Product Rights [Member]    
Finite-Lived Intangible Assets [Line Items]    
Net book value 3.5 6.3
Brand Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Net book value 1.8 2.3
Technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Net book value 18.0 19.8
Customer and Distributor Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Net book value 36.9 44.2
Internally Developed Software [Member]    
Finite-Lived Intangible Assets [Line Items]    
Net book value $ 1.7 $ 2.7