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Goodwill and Intangible Assets, Finite-lived intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross $ 199.7 $ 202.0
Finite-Lived Intangible Assets, Accumulated Amortization (28.5) (25.3)
Finite-Lived Intangible Assets, Net 171.2 176.7
Agricultural Products [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Net 109.9  
Specialty Chemicals [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Net 52.3  
Industrial Chemicals [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Net 9.0  
Customer Relationships [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 129.2 131.4
Finite-Lived Intangible Assets, Accumulated Amortization (10.0) (8.6)
Finite-Lived Intangible Assets, Net 119.2 122.8
Patents [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 0.6 0.6
Finite-Lived Intangible Assets, Accumulated Amortization (0.2) (0.2)
Finite-Lived Intangible Assets, Net 0.4 0.4
Trade Names [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 1.4 1.5
Finite-Lived Intangible Assets, Accumulated Amortization (0.3) (0.2)
Finite-Lived Intangible Assets, Net 1.1 1.3
Developed Technology Rights [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 63.6 63.6
Finite-Lived Intangible Assets, Accumulated Amortization (15.8) (14.4)
Finite-Lived Intangible Assets, Net 47.8 49.2
Other Intangible Assets [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 4.9 4.9
Finite-Lived Intangible Assets, Accumulated Amortization (2.2) (1.9)
Finite-Lived Intangible Assets, Net $ 2.7 $ 3.0