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Inventories - Components of Inventories (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Inventories [Line Items]    
Raw materials and supplies $ 36.6 $ 37.9
Work-in-process 8.8 8.1
Finished goods 69.3 65.0
Inventories $ 114.7 $ 111.0