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Inventories - Components of Inventories (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Raw materials and supplies $ 51.0 $ 50.8
Work-in-process 20.1 12.8
Finished goods 117.3 111.4
Inventories $ 188.4 $ 175.0