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Contingencies and restrictions - Tax Contingencies (Details)
 12 Months Ended
Dec. 19, 2024
USD ($)
Aug. 14, 2024
USD ($)
Apr. 05, 2024
USD ($)
Jan. 19, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jul. 15, 2021
USD ($)
Apr. 30, 2019
USD ($)
Mar. 24, 2017
USD ($)
Aug. 26, 2016
USD ($)
Dec. 31, 2024
USD ($)
tax_claim
Dec. 31, 2023
USD ($)
Disclosure of contingent liabilities [line items]                      
Mining assets                   $ 162,074,000 $ 154,715,000
SQM Salar | Non-current tax assets                      
Disclosure of contingent liabilities [line items]                      
Mining assets                   59,500,000 59,500,000
Chilean Internal Revenue Service (IRS) | SQM Salar | Pending Litigation Claims                      
Disclosure of contingent liabilities [line items]                      
Adjustment to tax expense (income)     $ 1,106,200,000                
First Tax And Customs Court | SQM Salar | Disallowed Donation Expense Under Article 21                      
Disclosure of contingent liabilities [line items]                      
Tax contingencies, dispute amount                   319,400  
Fourth Tax And Customs Court | SQM Salar | Disallowed Donation Expense Under Article 21                      
Disclosure of contingent liabilities [line items]                      
Tax contingencies, dispute amount                   209,100  
Santiago Metropolitan Region First Tax And Customs Court | Disallowed Donation Expense Under Article 21                      
Disclosure of contingent liabilities [line items]                      
Tax contingencies, dispute amount                   511,000  
Santiago Metropolitan Region First Tax And Customs Court | SQM Nitratos | Disallowed Donation Expense Under Article 21                      
Disclosure of contingent liabilities [line items]                      
Tax contingencies, dispute amount                   $ 319,400,000  
Tax Periods 2012 to 2023 | Chilean Internal Revenue Service (IRS) | SQM Salar                      
Disclosure of contingent liabilities [line items]                      
Tax contingencies, dispute amount                     986,300,000
Number of tax claims | tax_claim                   7  
Tax contingencies, assessed excess tax amount                     59,500,000
Tax contingencies, contested tax                     818,000,000
Interest and associated fines                     $ 108,800,000
Tax Periods 2011 To 2022 | Chilean Internal Revenue Service (IRS) | SQM Salar | Pending Litigation Claims                      
Disclosure of contingent liabilities [line items]                      
Adjustment to tax expense (income)     926,700,000                
Tax Period 2023 | Chilean Internal Revenue Service (IRS)                      
Disclosure of contingent liabilities [line items]                      
Tax contingencies, dispute amount   $ 785,000                  
Tax contingencies, assessed excess tax amount   10,900,000                  
Tax contingencies, contested tax   691,100                  
Interest and associated fines   $ 83,000                  
Tax Period 2023 | Chilean Internal Revenue Service (IRS) | SQM Salar | Pending Litigation Claims                      
Disclosure of contingent liabilities [line items]                      
Adjustment to tax expense (income)     162,800,000                
Tax Period 2024 | Chilean Internal Revenue Service (IRS) | SQM Salar | Pending Litigation Claims                      
Disclosure of contingent liabilities [line items]                      
Adjustment to tax expense (income)     $ 16,700,000                
Tax Period 2012 to 2014 | Third tax and customs court                      
Disclosure of contingent liabilities [line items]                      
Tax contingencies, dispute amount                 $ 17,800,000    
Tax contingencies, contested tax                 11,500,000    
Interest and associated fines                 $ 6,300,000    
Tax Period 2015 | Third tax and customs court                      
Disclosure of contingent liabilities [line items]                      
Tax contingencies, dispute amount               $ 3,200,000      
Tax Period 2016 | Third tax and customs court                      
Disclosure of contingent liabilities [line items]                      
Tax contingencies, dispute amount               5,500      
Tax Period 2016 | First Tax And Customs Court                      
Disclosure of contingent liabilities [line items]                      
Tax contingencies, dispute amount             $ 3,800,000        
Tax Period 2015 to 2016 | Third tax and customs court                      
Disclosure of contingent liabilities [line items]                      
Tax contingencies, assessed excess tax amount               1,200      
Tax contingencies, contested tax               3,800      
Interest and associated fines               $ 500      
Tax Period 2017 to 2018 | Third tax and customs court                      
Disclosure of contingent liabilities [line items]                      
Tax contingencies, dispute amount           $ 63,900,000          
Tax contingencies, assessed excess tax amount           17,600,000          
Tax contingencies, contested tax           30,200,000          
Interest and associated fines           $ 16,100,000          
Tax Period 2019 | First Tax And Customs Court                      
Disclosure of contingent liabilities [line items]                      
Tax contingencies, dispute amount         $ 36,700,000            
Tax contingencies, assessed excess tax amount         9,700,000            
Tax contingencies, contested tax         $ 27,000,000            
Tax Periods 2020 And 2021 | First Tax And Customs Court | Entering into significant commitments or contingent liabilities                      
Disclosure of contingent liabilities [line items]                      
Tax contingencies, dispute amount       $ 20,700,000              
Tax contingencies, assessed excess tax amount       5,600,000              
Tax contingencies, contested tax       15,100,000              
Tax Period 2022 | Third tax and customs court | Entering into significant commitments or contingent liabilities                      
Disclosure of contingent liabilities [line items]                      
Tax contingencies, dispute amount       53,500,000              
Tax contingencies, assessed excess tax amount       14,400,000              
Tax contingencies, contested tax       36,100,000              
Interest and associated fines       $ 3,000,000              
Tax Periods 2023 And 2024 | Chilean Internal Revenue Service (IRS) | Tax contingent liability                      
Disclosure of contingent liabilities [line items]                      
Law suits fines penalties and damages payable                   $ 179,400,000  
Tax Period January To September 2024 | Chilean Internal Revenue Service (IRS)                      
Disclosure of contingent liabilities [line items]                      
Tax contingencies, dispute amount $ 78,300                    
Interest and associated fines $ 25,300