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Other Intangible Assets - Schedule of Amortization Expense (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Finite-Lived Intangible Assets [Line Items]        
Amortization expense $ (5.7) $ (6.8) $ (17.2) $ (20.4)
Product Rights [Member]        
Finite-Lived Intangible Assets [Line Items]        
Amortization expense     (2.8) (2.8)
Brand Names [Member]        
Finite-Lived Intangible Assets [Line Items]        
Amortization expense     (0.5) (0.9)
Technology [Member]        
Finite-Lived Intangible Assets [Line Items]        
Amortization expense     (2.5) (2.5)
Customer Relationships [Member]        
Finite-Lived Intangible Assets [Line Items]        
Amortization expense     (7.9) (8.0)
Internally Developed Software [Member]        
Finite-Lived Intangible Assets [Line Items]        
Amortization expense     $ (3.5) $ (6.2)