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Other Intangible Assets - Schedule of Amortization Expense (Detail) - USD ($)
$ in Millions
Jul. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]      
Gross cost at January 1   $ 294.9 $ 294.8
Other Intangible Assets, Net $ 82.3 82.3 113.5
Product Rights [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross cost at January 1   8.2 10.1
Brand Names [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross cost at January 1   2.6 2.9
Technology [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross cost at January 1   20.9 32.6
Customer and Distributor Relationships [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross cost at January 1   45.8 60.8
Internally Developed Software [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross cost at January 1   $ 4.8 $ 7.1