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IMPAIRMENT, RESTRUCTURING AND OTHER - Schedule of Impairment, Restructuring, and Other Charges (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges (recoveries) | $ 693.1 | $ 4.3 | $ 0.8
Impairment, restructuring and other charges from continuing operations | 853.2 | 29.0 | 16.8
Restructuring and other charges (recoveries), net, from discontinued operations | 0.0 | 0.0 | (3.1)
Total impairment, restructuring and other charges | 853.2 | 29.0 | 13.7
Restructuring Reserve |  |  |
Amounts accrued for restructuring activities at beginning of year | 1.9 | 3.9 | 11.6
Restructuring and other charges from continuing operations | 47.1 | 29.0 | 20.0
Payments and other | (17.5) | (31.0) | (27.7)
Amounts accrued for restructuring activities at end of year | 31.5 | 1.9 | 3.9
Operating expenses |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Gains on sale of property, plant and equipment | (16.2) | 0.0 | 0.0
COVID-19 related costs | Cost of sales |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 0.0 | 25.0 | 15.5
COVID-19 related costs | Operating expenses |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 0.0 | 4.2 | 3.9
Restructuring and other charges (recoveries), net | Cost of sales |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges (recoveries) | 143.6 | (0.3) | (0.1)
Restructuring and other charges (recoveries), net | Operating expenses |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges (recoveries) | 40.9 | 0.1 | (3.1)
Property, plant and equipment impairments | Cost of sales |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges (recoveries) | 16.6 | 0.0 | 0.6
Goodwill and intangible asset impairments | Operating expenses |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and other charges (recoveries) | $ 668.3 | $ 0.0 | $ 0.0

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