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GOODWILL AND INTANGIBLE ASSETS - Schedule of Carrying Value and Accumulated Amortization for Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Amortizable intangible assets      
Gross Carrying Amount $ 741.0 $ 745.0  
Accumulated Amortization (524.9) (504.2)  
Net 216.1 240.8  
Total intangible assets, Gross Carrying Amount 1,462.5 1,494.6  
Total intangible assets, Net 937.6 990.4  
Amortization expense 41.6 44.5 $ 42.3
Tradenames      
Amortizable intangible assets      
Indefinite-lived intangible assets 721.5 749.6  
Customer relationships      
Amortizable intangible assets      
Gross Carrying Amount 621.3 641.8  
Accumulated Amortization (465.9) (452.3)  
Net 155.4 189.5  
Technology assets      
Amortizable intangible assets      
Gross Carrying Amount 75.3 75.3  
Accumulated Amortization (46.1) (41.0)  
Net 29.2 34.3  
Tradenames      
Amortizable intangible assets      
Gross Carrying Amount 44.4 27.9  
Accumulated Amortization (12.9) (10.9)  
Net $ 31.5 $ 17.0