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COMMITMENTS AND CONTINGENCIES (Details)
$ in Millions
3 Months Ended 12 Months Ended
Jul. 16, 2018
Jun. 30, 2017
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jan. 01, 2020
agreement
Dec. 31, 2016
USD ($)
Loss Contingencies [Line Items]              
Collective-bargaining arrangement, contract term 3 years            
Maximum exposure for other labor matters     $ 25.0 $ 31.0      
Unions [Abstract]              
Percentage of company's global workforce represented by labor unions     30.00%        
Royalties [Abstract]              
Royalty expense     $ 16.3 14.8 $ 14.5    
Sales contracts [Abstract]              
Guarantor obligations, performance bonds outstanding     155.8        
Purchase commitments [Abstract]              
Purchase commitments for 2020     30.3        
Purchase commitments for 2021     9.0        
Purchase commitments for 2022     7.6        
Purchase commitments for 2023     5.0        
Purchase commitments for 2024     $ 2.9        
U.S., Canada, and U.K.              
Unions [Abstract]              
Percentage of company's global workforce represented by labor unions     50.00%        
Subsequent Event              
Unions [Abstract]              
Number of collective bargaining agreements (in agreements) | agreement           12  
Number of collective bargaining agreements expiring in 2020 (in agreements)           4  
Number of collective bargaining agreements expiring in 2021 (in agreements)           2  
Number of collective bargaining agreements expiring in 2022 (in agreements)           5  
Number of collective bargaining agreements expiring in 2027 (in agreements)           1  
Workforce subject to collective bargaining arrangements | Labor force concentration risk | Brazil              
Unions [Abstract]              
Percentage of concentration risk     40.00%        
Compass Minerals South America              
Loss Contingencies [Line Items]              
Contingent liabilities assumed     $ 5.6 7.8      
Cote Blanche              
Loss Contingencies [Line Items]              
Reserve for expected payments required to resolve the dispute             $ 7.4
Settlement amount   $ 7.7          
Brazilian Tax Litigation And Assessments              
Loss Contingencies [Line Items]              
Possible tax proceedings and claims     $ 15.8 $ 15.9