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Other Intangible Assets - Schedule of Amortization Expense (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Finite-Lived Intangible Assets [Line Items]        
Amortization expense $ (5.8) $ (6.9) $ (11.5) $ (13.6)
Product Rights [Member]        
Finite-Lived Intangible Assets [Line Items]        
Amortization expense     (1.9) (1.9)
Brand Names [Member]        
Finite-Lived Intangible Assets [Line Items]        
Amortization expense     (0.3) (0.6)
Technology [Member]        
Finite-Lived Intangible Assets [Line Items]        
Amortization expense     (1.7) (1.7)
Customer Relationships [Member]        
Finite-Lived Intangible Assets [Line Items]        
Amortization expense     (5.3) (5.3)
Internally Developed Software [Member]        
Finite-Lived Intangible Assets [Line Items]        
Amortization expense     $ (2.3) $ (4.1)