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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

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