Summary of Losses on Assets Recorded at Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Goodwill impairment	$ 61.8	$ 61.8	$ 0.0	$ 0.0
Identifiable intangible assets impairment		0.1
RANA
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Goodwill impairment		61.8
Cosmedicine
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Identifiable intangible assets impairment		0.1
Inventories impairment		0.7
Fair Value, Measurements, Nonrecurring Basis | RANA
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Goodwill impairment		61.8
Fair Value, Measurements, Nonrecurring Basis | Cosmedicine
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Identifiable intangible assets impairment		0.1
Inventories impairment		$ 0.7