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Inventories (Detail) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Inventory [Line Items]    
Total inventories $ 89.3 $ 101.2
Real Alloy    
Inventory [Line Items]    
Finished goods 31.2 32.2
Raw materials and work in process 57.2 68.1
Total inventories 88.4 100.3
Cosmedicine    
Inventory [Line Items]    
Finished goods $ 0.9 $ 0.9