Other Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross cost	$ 294.6	$ 295.8
Accumulated amortization	(158.3)	(132.5)
Other Intangible Assets, Net	136.3	163.3
Product Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross cost	34.0	34.0
Accumulated amortization	(20.1)	(16.4)
Brand Names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross cost	8.9	8.9
Accumulated amortization	(5.4)	(4.4)
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross cost	55.1	55.1
Accumulated amortization	(19.1)	(15.7)
Customer and Distributor Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross cost	125.6	127.5
Accumulated amortization	(53.5)	(43.2)
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Gross cost	2.9	2.9
Accumulated amortization	(2.9)	(2.9)
Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross cost	4.1	4.1
Accumulated amortization	(4.1)	(4.1)
Marketing Related [Member]
Finite-Lived Intangible Assets [Line Items]
Gross cost	22.1	22.1
Accumulated amortization	(22.1)	(22.1)
Internally Developed Software [Member]
Finite-Lived Intangible Assets [Line Items]
Gross cost	41.9	41.2
Accumulated amortization	$ (31.1)	$ (23.7)