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MARKETING AGREEMENT - Net Commission Earned Under the Marketing Agreement (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Marketing Agreement [Line Items]      
Contribution expenses $ (2,348.6) $ (2,618.7) $ (2,708.3)
Monsanto Marketing Agreement      
Marketing Agreement [Line Items]      
Gross commission 91.8 90.8 75.7
Contribution expenses (18.0) (18.0) (18.0)
Net commission 73.8 72.8 57.7
Reimbursements associated with Roundup® marketing agreement 87.0 91.2 82.5
Total net sales associated with Roundup® marketing agreement $ 160.8 $ 164.0 $ 140.2