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Goodwill and Intangible Assets, Goodwill (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Goodwill [Roll Forward]  
Beginning Balance $ 225.9
Acquisitions 42.9
Goodwill, Allocation Adjustment (0.6)
Foreign Currency Adjustments 1.8
Ending Balance 270.0
Agricultural Products [Member]
 
Goodwill [Roll Forward]  
Beginning Balance 12.4
Acquisitions 0
Goodwill, Allocation Adjustment (0.9)
Foreign Currency Adjustments 0.2
Ending Balance 11.7
Specialty Chemicals [Member]
 
Goodwill [Roll Forward]  
Beginning Balance 197.0
Acquisitions 42.9
Goodwill, Allocation Adjustment 0.4
Foreign Currency Adjustments 1.6
Ending Balance 241.9
Industrial Chemicals [Member]
 
Goodwill [Roll Forward]  
Beginning Balance 16.5
Acquisitions 0
Goodwill, Allocation Adjustment (0.1)
Foreign Currency Adjustments 0
Ending Balance $ 16.4