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MARKETING AGREEMENT - Net Commission Earned Under the Marketing Agreement (Details) - USD ($) $ in Millions | 12 Months Ended
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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

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