MARKETING AGREEMENT - Net Commission Earned Under the Marketing Agreement (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Sep. 30, 2022 |
Sep. 30, 2021 |
Sep. 30, 2020 |
|
| Marketing Agreement [Line Items] | |||
| Contribution expenses | $ (2,891.1) | $ (3,431.3) | $ (2,768.6) |
| Monsanto Marketing Agreement | |||
| Marketing Agreement [Line Items] | |||
| Gross commission | 83.4 | 94.0 | 90.4 |
| Contribution expenses | (18.0) | (18.0) | (18.0) |
| Net commission | 65.4 | 76.0 | 72.4 |
| Reimbursements associated with Roundup® marketing agreement | 67.9 | 70.8 | 61.6 |
| Total net sales associated with Roundup® marketing agreement | $ 133.3 | $ 146.8 | $ 134.0 |