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GOODWILL AND OTHER INTANGIBLE ASSETS (Additional Information) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization expense $ 13.6 $ 15.0 $ 16.2
Projected amortization expense over the next 5 years [Abstract]      
Projected amortization expense, minimum 6.0    
Projected amortization expense, maximum $ 13.0    
Remaining amortization period 5 years    
Weighted-Average Amortization Period (in years) 19 years    
Acquired Indefinite-lived Intangible Assets [Line Items]      
Goodwill $ 343.0 350.8  
Plant Nutrition North America      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Goodwill 55.4 52.6  
Plant Nutrition South America      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Goodwill 281.6 292.3  
Water rights      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Indefinite-lived intangible assets 17.7 17.7  
Trade Names      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Indefinite-lived intangible assets $ 0.6 $ 0.5