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Significant Accounting Policies (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Accounting Policies [Abstract]      
Net sales $ 11,122.8 $ 13,696.1 $ 19,125.2
Sales And Receivables [Line Items]      
Canadian resources taxes and royalties included in cost of goods sold 272.7 457.0 1,000.0
Assets related to PIS and Cofins and income tax credits in Brazil $ 96.2 136.5  
Minimum | Machinery and equipment      
Sales And Receivables [Line Items]      
Useful life 3 years    
Minimum | Buildings and Leashold Improvements      
Sales And Receivables [Line Items]      
Useful life 3 years    
Maximum      
Sales And Receivables [Line Items]      
Duration of short term investments in number of days 90 days    
Maximum | Machinery and equipment      
Sales And Receivables [Line Items]      
Useful life 25 years    
Maximum | Buildings and Leashold Improvements      
Sales And Receivables [Line Items]      
Useful life 40 years    
Canpotex      
Sales And Receivables [Line Items]      
Accounts Receivable, Related Parties, Current $ 65.1 193.1  
Canpotex      
Accounting Policies [Abstract]      
Net sales [1],[2]   $ 1,300.0 $ 3,000.0
[1] Canpotex sales to the ultimate third-party customers are made to customers in various countries. The countries with the largest portion of third-party customer sales are Brazil, China, India, and Indonesia.
[2] Revenues are attributed to countries based on location of customer.