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GOODWILL AND INTANGIBLE ASSETS, NET - Schedule of Intangible Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Sep. 30, 2024
Indefinite-lived Intangible Assets [Line Items]    
Total indefinite-lived intangible assets $ 323.9 $ 323.9
Total intangible assets, net 401.8 418.8
Intangible Assets [Line Items]    
Total finite-lived intangible assets, net 77.9 94.9
Trade names    
Indefinite-lived Intangible Assets [Line Items]    
Total indefinite-lived intangible assets 168.2 168.2
Roundup® marketing agreement amendment    
Indefinite-lived Intangible Assets [Line Items]    
Total indefinite-lived intangible assets 155.7 155.7
Trade names    
Intangible Assets [Line Items]    
Gross Carrying Amount 320.5 325.8
Accumulated Amortization/ Impairment Charges (275.7) (272.8)
Total finite-lived intangible assets, net 44.8 53.0
Customer relationships    
Intangible Assets [Line Items]    
Gross Carrying Amount 246.3 253.1
Accumulated Amortization/ Impairment Charges (223.8) (223.9)
Total finite-lived intangible assets, net 22.5 29.2
Technology    
Intangible Assets [Line Items]    
Gross Carrying Amount 50.1 50.2
Accumulated Amortization/ Impairment Charges (46.4) (45.5)
Total finite-lived intangible assets, net 3.7 4.7
Other    
Intangible Assets [Line Items]    
Gross Carrying Amount 34.5 35.0
Accumulated Amortization/ Impairment Charges (27.6) (27.0)
Total finite-lived intangible assets, net $ 6.9 $ 8.0