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IMPAIRMENT, RESTRUCTURING AND OTHER - Schedule of Impairment, Restructuring, and Other Charges (Details) - USD ($) $ in Millions | 12 Months Ended
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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

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