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Business Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Disaggregation of Revenue [Line Items]        
Net Sales $ 3,452.1 $ 2,810.9 $ 9,078.7 $ 8,306.9
Cost of goods sold 2,899.8 2,394.1 7,519.4 7,096.9
Gross margin 552.3 416.8 1,559.3 1,210.0
Selling, general and administrative expenses 125.5 148.2 415.3 383.4
Other operating expense 87.0 153.2 221.3 305.0
Corporate, other and intersegment eliminations        
Disaggregation of Revenue [Line Items]        
Gross margin     60.1 (70.3)
Phosphates segment        
Disaggregation of Revenue [Line Items]        
Gross margin     414.2 455.4
Potash segment        
Disaggregation of Revenue [Line Items]        
Gross margin     613.9 520.0
Mosaic Fertilizantes segment        
Disaggregation of Revenue [Line Items]        
Gross margin     471.1 304.9
Product        
Disaggregation of Revenue [Line Items]        
Net Sales [1] 3,452.1 2,810.9 9,078.7 8,306.9
Revenues 3,452.1 2,810.9 9,078.7 8,306.9
Cost of goods sold [2] 2,899.8 2,394.1 7,519.4 7,096.9
Gross margin 552.3 416.8    
Selling, general and administrative expenses [3] 125.5 148.2 415.3 383.4
Other operating expense [4] 87.0 153.2 221.3 305.0
Product | Corporate, other and intersegment eliminations        
Disaggregation of Revenue [Line Items]        
Net Sales 114.4 113.3 401.0 372.0
Revenues (125.1) (119.3) (159.5) (213.0)
Cost of goods sold [2] (115.2) (144.1) (219.6) (142.8)
Gross margin (9.9) 24.7    
Selling, general and administrative expenses [3] 77.4 67.9 242.2 207.3
Other operating expense [4] 0.0 (14.5) (12.2) (22.7)
Product | Corporate, other and intersegment eliminations | China and India distribution operations        
Disaggregation of Revenue [Line Items]        
Revenues 112.4 111.1 392.3 361.2
Gross margin 13.2 15.9 53.2 25.9
Product | Phosphates segment        
Disaggregation of Revenue [Line Items]        
Net Sales 1,046.7 776.7 2,996.1 2,788.9
Revenues 1,290.2 1,005.3 3,561.8 3,353.5
Cost of goods sold [2] 1,146.3 863.0 3,147.6 2,898.1
Gross margin 143.9 142.3    
Selling, general and administrative expenses [3] 9.6 11.6 34.1 34.7
Other operating expense [4] (32.0) (123.1) (146.3) (239.9)
Product | Potash segment        
Disaggregation of Revenue [Line Items]        
Net Sales 698.8 521.7 1,980.7 1,811.5
Revenues 694.8 525.7 1,975.5 1,831.9
Cost of goods sold [2] 458.9 403.8 1,361.6 1,311.9
Gross margin 235.9 121.9    
Selling, general and administrative expenses [3] 6.5 7.2 22.6 22.8
Other operating expense [4] (0.7) (5.4) (11.7) (15.5)
Product | Mosaic Fertilizantes segment        
Disaggregation of Revenue [Line Items]        
Net Sales 1,592.2 1,399.2 3,700.9 3,334.5
Revenues 1,592.2 1,399.2 3,700.9 3,334.5
Cost of goods sold [2] 1,409.8 1,271.4 3,229.8 3,029.7
Gross margin 182.4 127.9    
Selling, general and administrative expenses [3] 32.0 61.5 116.4 118.6
Other operating expense [4] (54.3) (10.2) (51.1) (26.9)
Product | Canada | Transferred at Point in Time        
Disaggregation of Revenue [Line Items]        
Net Sales [1] $ 63.3 $ 68.2 $ 269.2 $ 357.4
[1] Revenues are attributed to countries based on location of customer.
[2] The primary components of cost of goods sold are raw material purchases, including sulfur and ammonia, conversion costs and transportation costs.
[3] Selling, general and administrative expenses include nonmanufacturing payroll expense and professional services expense.
[4] Other operating expenses typically relate to five major categories: (1) AROs, (2) environmental and legal reserves, (3) idle facility costs, (4) insurance reimbursements, and (5) gain/loss on sale or disposal of fixed assets.