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IMPAIRMENT, RESTRUCTURING AND OTHER - Schedule of Impairment, Restructuring, and Other Charges (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Restructuring Cost and Reserve [Line Items]      
Restructuring and other charges (recoveries) $ 4.3 $ 0.8 $ 7.4
Impairment, restructuring and other charges from continuing operations 29.0 16.8 13.3
Restructuring and other charges (recoveries), net, from discontinued operations 0.0 (3.1) (35.8)
Total impairment, restructuring and other charges (recoveries) 29.0 13.7 (22.5)
Restructuring Reserve      
Amounts accrued for restructuring and other at beginning of year 3.9 11.6 112.2
Restructuring and other charges from continuing operations 29.0 20.0 13.4
Restructuring and other charges (recoveries) from discontinued operations 0.0 0.0 (22.4)
Payments and other (31.0) (27.7) (91.6)
Amounts accrued for restructuring and other at end of year 1.9 3.9 11.6
COVID-19 related costs | Cost of sales      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 25.0 15.5 0.0
COVID-19 related costs | Operating expenses      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 4.2 3.9 0.0
Restructuring and other charges (recoveries), net | Cost of sales      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other charges (recoveries) (0.3) (0.1) 5.1
Restructuring and other charges (recoveries), net | Operating expenses      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other charges (recoveries) 0.1 (3.1) 7.4
Intangible asset and property, plant and equipment impairments | Cost of sales      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other charges (recoveries) $ 0.0 $ 0.6 $ 0.8