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IMPAIRMENT, RESTRUCTURING AND OTHER - Schedule of Impairment, Restructuring, and Other Charges (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Restructuring Cost and Reserve [Line Items]      
Restructuring and other charges (recoveries), net $ 280.5 $ 693.1 $ 4.3
Total impairment, restructuring and other charges 466.1 853.2 29.0
Restructuring Reserve      
Amounts accrued at beginning of year 31.5 1.9 3.9
Restructuring charges 55.6 47.1 29.0
Payments (46.6) (17.5) (31.0)
Amounts accrued at end of year 40.5 31.5 1.9
Operating expenses      
Restructuring Cost and Reserve [Line Items]      
Goodwill and intangible asset impairments 127.9 668.3 0.0
Convertible debt other-than-temporary impairments 101.3 0.0 0.0
Gains on sale of property, plant and equipment 0.0 (16.2) 0.0
COVID-19 related costs | Cost of sales      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 0.0 0.0 25.0
COVID-19 related costs | Operating expenses      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 0.0 0.0 4.2
Restructuring and other charges, net | Cost of sales      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other charges (recoveries), net 148.5 143.6 (0.3)
Restructuring and other charges, net | Operating expenses      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other charges (recoveries), net 51.2 40.9 0.1
Property, plant and equipment impairments | Cost of sales      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other charges (recoveries), net 11.4 16.6 0.0
Right-of-use Asset Impairment | Cost of Sales, Impairment, Restructuring and Other Charges      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other charges (recoveries), net $ 25.8 $ 0.0 $ 0.0