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Goodwill and Intangible Assets, Indefinite Life Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Indefinite-lived Intangible Assets by Segment [Line Items]    
Indefinite-Lived Intangible Assets (Excluding Goodwill) $ 39.0 $ 39.0
Finite and Indefinite lived intangible assets, gross 238.7 241.0
Intangible Asset, Accumulated Amortization (28.5) (25.3)
Intangible Assets, Net (Excluding Goodwill) 210.2 215.7
Agricultural Products [Member]
   
Indefinite-lived Intangible Assets by Segment [Line Items]    
Indefinite-Lived Intangible Assets (Excluding Goodwill) 35.2  
Specialty Chemicals [Member]
   
Indefinite-lived Intangible Assets by Segment [Line Items]    
Indefinite-Lived Intangible Assets (Excluding Goodwill) 3.2  
Industrial Chemicals [Member]
   
Indefinite-lived Intangible Assets by Segment [Line Items]    
Indefinite-Lived Intangible Assets (Excluding Goodwill) 0.6  
Trade Names [Member]
   
Indefinite-lived Intangible Assets by Segment [Line Items]    
Indefinite-Lived Intangible Assets (Excluding Goodwill) 36.3 36.3
Other Intangible Assets [Member]
   
Indefinite-lived Intangible Assets by Segment [Line Items]    
Indefinite-Lived Intangible Assets (Excluding Goodwill) $ 2.7 $ 2.7