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OPERATING SEGMENTS (Segment Information) (Details)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2016
Business
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
segment
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Segment Reporting Information [Line Items]                        
Number of reportable segments (in segments) | segment                   3    
Sales   $ 486.5 $ 322.5 $ 246.7 $ 437.9 $ 457.9 $ 290.7 $ 228.0 $ 387.8 $ 1,493.6 $ 1,364.4 $ 1,138.0
Operating earnings (loss)                   130.3 159.2 174.6
Depreciation, depletion and amortization                   136.9 122.2 90.3
Total assets   2,367.9       2,571.0       2,367.9 2,571.0 2,466.5
Capital expenditures                   96.8 114.1 182.2
Reportable segments | Salt                        
Segment Reporting Information [Line Items]                        
Sales                   858.1 769.2 811.9
Operating earnings (loss)                   115.7 138.0 200.6
Depreciation, depletion and amortization                   56.2 55.0 46.7
Total assets   948.9       1,030.6       948.9 1,030.6 980.3
Capital expenditures                   58.7 65.8 103.4
Reportable segments | Plant Nutrition North America                        
Segment Reporting Information [Line Items]                        
Sales                   233.2 210.0 203.0
Operating earnings (loss)                   25.3 27.7 21.1
Depreciation, depletion and amortization                   48.6 36.9 33.4
Total assets   589.3       601.1       589.3 601.1 592.3
Capital expenditures                   20.7 31.9 63.6
Reportable segments | Plant Nutrition South America                        
Segment Reporting Information [Line Items]                        
Sales                   391.8 375.0 113.5
Operating earnings (loss)                   48.7 49.1 7.4
Depreciation, depletion and amortization                   22.2 22.6 5.0
Total assets   709.9       808.0       709.9 808.0 844.9
Capital expenditures                   10.1 11.3 2.1
Corporate & other                        
Segment Reporting Information [Line Items]                        
Sales                   10.5 10.2 9.6
Operating earnings (loss)                   (59.4) (55.6) (54.5)
Depreciation, depletion and amortization                   9.9 7.7 5.2
Total assets   $ 119.8       $ 131.3       119.8 131.3 49.0
Capital expenditures                   7.3 5.1 13.1
Intersegment sales                        
Segment Reporting Information [Line Items]                        
Sales                   (9.0) (6.5) (5.2)
Intersegment sales | Salt                        
Segment Reporting Information [Line Items]                        
Sales                   0.0 0.0 0.0
Intersegment sales | Plant Nutrition North America                        
Segment Reporting Information [Line Items]                        
Sales                   5.6 6.5 5.2
Intersegment sales | Plant Nutrition South America                        
Segment Reporting Information [Line Items]                        
Sales                   3.4 0.0 0.0
Produquímica                        
Segment Reporting Information [Line Items]                        
Number of primary businesses (in businesses) | Business 2                      
Sales                   391.8 375.0  
Shipping and handling cost                        
Segment Reporting Information [Line Items]                        
Shipping and handling cost                   320.0 267.5 244.9
Shipping and handling cost | Reportable segments | Salt                        
Segment Reporting Information [Line Items]                        
Shipping and handling cost                   272.4 220.6 214.5
Shipping and handling cost | Reportable segments | Plant Nutrition North America                        
Segment Reporting Information [Line Items]                        
Shipping and handling cost                   29.0 28.1 25.0
Shipping and handling cost | Reportable segments | Plant Nutrition South America                        
Segment Reporting Information [Line Items]                        
Shipping and handling cost                   18.6 18.8 5.4
Shipping and handling cost | Corporate & other                        
Segment Reporting Information [Line Items]                        
Shipping and handling cost                   $ 0.0 $ 0.0 $ 0.0