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RESTRUCTURING AND RELATED CHARGES - Summary of Costs Incurred by Reporting Segment (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Restructuring Cost and Reserve [Line Items]      
Restructuring and related charges $ 40.3 $ 71.6 $ 61.0
Cumulative costs 152.2    
Future costs to be incurred 27.7    
Corporate      
Restructuring Cost and Reserve [Line Items]      
Restructuring and related charges 15.6 45.7 43.5
Cumulative costs 98.6    
Future costs to be incurred 13.9    
HPC | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Restructuring and related charges 9.1 4.6 8.1
Cumulative costs 20.6    
Future costs to be incurred 1.3    
GPC | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Restructuring and related charges 15.2 20.8 7.6
Cumulative costs 30.3    
Future costs to be incurred 12.5    
H&G | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Restructuring and related charges 0.4 $ 0.5 $ 1.8
Cumulative costs 2.7    
Future costs to be incurred $ 0.0