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IMPAIRMENT, RESTRUCTURING AND OTHER - Schedule of Impairment, Restructuring, and Other Charges (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Restructuring Cost and Reserve [Line Items]      
Restructuring and other charges, net $ 63.4 $ 62.8 $ 280.5
Loss on sale of business 17.7 0.0 0.0
Impairment, restructuring and other charges from continuing operations 83.8 146.3 466.1
Restructuring Reserve      
Amounts accrued at beginning of year 18.9 40.5 31.5
Restructuring charges 36.2 11.8 55.6
Payments (36.0) (33.4) (46.6)
Amounts accrued at end of year 19.1 18.9 40.5
Operating expenses      
Restructuring Cost and Reserve [Line Items]      
Goodwill and intangible asset impairments 3.6 2.5 127.9
Restructuring and other charges (recoveries), net | Cost of sales      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other charges, net 11.9 72.9 148.5
Restructuring and other charges (recoveries), net | Operating expenses      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other charges, net 35.2 (4.3) 51.2
Loss on sale of business 17.7 0.0 0.0
Loss on exchange of convertible debt investment 7.0 0.0 0.0
Convertible debt other-than-temporary impairments 0.0 64.6 101.3
Property, plant and equipment impairments | Cost of sales      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other charges, net 3.9 5.3 11.4
Right-of-use Asset Impairment | Cost of Sales, Impairment, Restructuring and Other Charges      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other charges, net $ 4.5 $ 5.3 $ 25.8