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IMPAIRMENT, RESTRUCTURING AND OTHER - Schedule of Impairment, Restructuring, and Other Charges (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Restructuring Cost and Reserve [Line Items]      
Restructuring and other charges, net $ 62.8 $ 280.5 $ 693.1
Total impairment, restructuring and other charges 146.3 466.1 853.2
Restructuring Reserve      
Amounts accrued at beginning of year 40.5 31.5 1.9
Restructuring charges 11.8 55.6 47.1
Payments (33.4) (46.6) (17.5)
Amounts accrued at end of year 18.9 40.5 31.5
Operating expenses      
Restructuring Cost and Reserve [Line Items]      
Goodwill and intangible asset impairments 2.5 127.9 668.3
Convertible debt other-than-temporary impairments 64.6 101.3 0.0
Gains on sale of property, plant and equipment 0.0 0.0 (16.2)
Restructuring and other charges (recoveries), net | Cost of sales      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other charges, net 72.9 148.5 143.6
Restructuring and other charges (recoveries), net | Operating expenses      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other charges, net (4.3) 51.2 40.9
Property, plant and equipment impairments | Cost of sales      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other charges, net 5.3 11.4 16.6
Right-of-use Asset Impairment | Cost of Sales, Impairment, Restructuring and Other Charges      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other charges, net $ 5.3 $ 25.8 $ 0.0