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ACCUMULATED OTHER COMPREHENSIVE INCOME - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Net sales $ 2,918.8 $ 3,132.5 $ 2,998.1
Other non-operating expense (income), net (3.8) (14.7) 7.2
Income (loss) from discontinued operations, net of tax 2,035.6 149.7 174.3
Reclassification out of Accumulated Other Comprehensive Income      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Net sales 0.2 0.1 0.1
Cost of goods sold (12.4) 20.1 (9.3)
Other non-operating expense (income), net (0.8) (3.6) (4.8)
Income (loss) from discontinued operations, net of tax (2.2) 2.5 0.0
Defined Benefit Pension | Reclassification out of Accumulated Other Comprehensive Income      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Net sales 0.0 0.0 0.0
Cost of goods sold 0.0 0.0 0.0
Other non-operating expense (income), net (0.8) (3.6) (4.8)
Income (loss) from discontinued operations, net of tax 0.1 0.1 0.1
Derivative Instruments | Reclassification out of Accumulated Other Comprehensive Income      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Net sales 0.2 0.1 0.1
Cost of goods sold (12.4) 20.1 (9.3)
Other non-operating expense (income), net 0.0 0.0 0.0
Income (loss) from discontinued operations, net of tax $ (2.3) $ 2.4 $ (0.1)