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Goodwill and Intangible Assets Goodwill and Intangible Assets, by Segment (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets, Net $ 171.2 $ 176.7
Indefinite-Lived Intangible Assets (Excluding Goodwill) 39.0 39.0
Specialty Chemicals [Member]
   
Finite-Lived Intangible Assets, Net 52.3  
Indefinite-Lived Intangible Assets (Excluding Goodwill) 3.2  
Industrial Chemicals [Member]
   
Finite-Lived Intangible Assets, Net 9.0  
Indefinite-Lived Intangible Assets (Excluding Goodwill) 0.6  
Agricultural Products [Member]
   
Finite-Lived Intangible Assets, Net 109.9  
Indefinite-Lived Intangible Assets (Excluding Goodwill) $ 35.2