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OPERATING SEGMENTS (Information by Product) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]                      
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
CEO transition costs, gross $ 5.1               5.1    
Restructuring charges                   4.3  
Reportable segments | Salt                      
Segment Reporting Information [Line Items]                      
Sales                 858.1 769.2 811.9
Reportable segments | Plant Nutrition North America                      
Segment Reporting Information [Line Items]                      
Sales                 233.2 210.0 203.0
Reportable segments | Plant Nutrition South America                      
Segment Reporting Information [Line Items]                      
Sales                 391.8 375.0 113.5
Corporate & other                      
Segment Reporting Information [Line Items]                      
Sales                 10.5 10.2 9.6
Highway Deicing Salt                      
Segment Reporting Information [Line Items]                      
Sales                 532.0 455.1 490.7
Highway Deicing Salt | Reportable segments | Salt                      
Segment Reporting Information [Line Items]                      
Sales                 532.0 455.1 490.7
Highway Deicing Salt | Reportable segments | Plant Nutrition North America                      
Segment Reporting Information [Line Items]                      
Sales                 0.0 0.0 0.0
Highway Deicing Salt | Reportable segments | Plant Nutrition South America                      
Segment Reporting Information [Line Items]                      
Sales                 0.0 0.0 0.0
Highway Deicing Salt | Corporate & other                      
Segment Reporting Information [Line Items]                      
Sales                 0.0 0.0 0.0
Consumer & Industrial Salt                      
Segment Reporting Information [Line Items]                      
Sales                 326.1 314.1 321.2
Consumer & Industrial Salt | Reportable segments | Salt                      
Segment Reporting Information [Line Items]                      
Sales                 326.1 314.1 321.2
Consumer & Industrial Salt | Reportable segments | Plant Nutrition North America                      
Segment Reporting Information [Line Items]                      
Sales                 0.0 0.0 0.0
Consumer & Industrial Salt | Reportable segments | Plant Nutrition South America                      
Segment Reporting Information [Line Items]                      
Sales                 0.0 0.0 0.0
Consumer & Industrial Salt | Corporate & other                      
Segment Reporting Information [Line Items]                      
Sales                 0.0 0.0 0.0
SOP and Specialty Plant Nutrients                      
Segment Reporting Information [Line Items]                      
Sales                 539.0 490.1 295.0
SOP and Specialty Plant Nutrients | Reportable segments | Salt                      
Segment Reporting Information [Line Items]                      
Sales                 0.0 0.0 0.0
SOP and Specialty Plant Nutrients | Reportable segments | Plant Nutrition North America                      
Segment Reporting Information [Line Items]                      
Sales                 238.8 216.5 208.2
SOP and Specialty Plant Nutrients | Reportable segments | Plant Nutrition South America                      
Segment Reporting Information [Line Items]                      
Sales                 300.2 273.6 86.8
SOP and Specialty Plant Nutrients | Corporate & other                      
Segment Reporting Information [Line Items]                      
Sales                 0.0 0.0 0.0
Industrial Chemicals                      
Segment Reporting Information [Line Items]                      
Sales                 95.0 101.4 26.7
Industrial Chemicals | Reportable segments | Salt                      
Segment Reporting Information [Line Items]                      
Sales                 0.0 0.0 0.0
Industrial Chemicals | Reportable segments | Plant Nutrition North America                      
Segment Reporting Information [Line Items]                      
Sales                 0.0 0.0 0.0
Industrial Chemicals | Reportable segments | Plant Nutrition South America                      
Segment Reporting Information [Line Items]                      
Sales                 95.0 101.4 26.7
Industrial Chemicals | Corporate & other                      
Segment Reporting Information [Line Items]                      
Sales                 0.0 0.0 0.0
Eliminations & Other                      
Segment Reporting Information [Line Items]                      
Sales                 1.5 3.7 4.4
Eliminations & Other | Reportable segments | Salt                      
Segment Reporting Information [Line Items]                      
Sales                 0.0 0.0 0.0
Eliminations & Other | Reportable segments | Plant Nutrition North America                      
Segment Reporting Information [Line Items]                      
Sales                 (5.6) (6.5) (5.2)
Eliminations & Other | Reportable segments | Plant Nutrition South America                      
Segment Reporting Information [Line Items]                      
Sales                 (3.4) 0.0 0.0
Eliminations & Other | Corporate & other                      
Segment Reporting Information [Line Items]                      
Sales                 $ 10.5 $ 10.2 $ 9.6