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Inventories - Components of Inventories (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Inventory Disclosure [Abstract]    
Raw materials and supplies $ 37.8 $ 36.6
Work-in-process 12.4 8.8
Finished goods 92.0 69.3
Inventories $ 142.2 $ 114.7