Financial Statement Presentation and Significant Accounting Policies - Additional Information (Detail) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($) entity	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) entity	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Schedule Of Significant Accounting Policies
Inventory estimated net realizable value	$ 125.9		$ 125.9		$ 118.2
Intellectual property estimated net realizable value	10.7		10.7		12.5
Cost of sales	320.5	$ 298.3	976.3	$ 889.7
Selling, general and administrative expenses	$ 12.4	$ 18.1	$ 39.2	48.1
Immaterial error correction			Management concluded that the error correction in 2016 was not material to the full year results of operations.
Number of VIE treated as unconsolidated equity method investment | entity	1		1
Equity method investment	$ 7.9		$ 7.9		$ 5.0
Beck Trading
Schedule Of Significant Accounting Policies
Equity method investment	7.9		7.9
Maximum loss exposure amount	9.1		9.1
Adjustment To Correct Depreciation Expense Error
Schedule Of Significant Accounting Policies
Cost of sales				3.7
Selling, general and administrative expenses				$ 0.1
Cosmedicine | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations
Schedule Of Significant Accounting Policies
Inventory estimated net realizable value	0.0		0.0
Cosmedicine | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Intellectual Property
Schedule Of Significant Accounting Policies
Intellectual property estimated net realizable value	$ 0.0		$ 0.0