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DIVESTITURES - Significant Non-cash Items and Capital Expenditures of Discontinued Operations (Details) - HHI Segment - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Depreciation and amortization $ 31.1 $ 33.9 $ 33.5
Share and incentive based compensation 0.8 6.0 5.0
Purchases of property, plant and equipment $ 22.8 $ 16.9 $ 18.0