Other Intangible Assets - Schedule of Amortization Expense (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ (6.9)	$ (6.8)	$ (13.6)	$ (13.7)
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			(0.6)	(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)	(5.1)
Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense			0.0	(0.4)
Marketing Related [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense			0.0	(0.4)
Internally Developed Software [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense			$ (4.1)	$ (3.6)