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Other Intangible Assets - Schedule of Amortization Expense (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Amortization expense $ (6.9) $ (6.0)
Product Rights [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortization expense (0.9) (0.9)
Brand Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortization expense (0.3) (0.3)
Technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortization expense (0.9) (0.9)
Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortization expense (2.6) (1.7)
Non-Compete Agreements [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortization expense (0.2) (0.2)
Marketing Related [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortization expense (0.2) (0.2)
Internally Developed Software [Member]    
Finite-Lived Intangible Assets [Line Items]    
Amortization expense $ (1.8) $ (1.8)