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EQUITY METHOD INVESTMENTS - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2021
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
May 05, 2023
Schedule of Equity Method Investments [Line Items]                
Net loss in equity investees       $ (0.5) $ (3.1) $ (5.2) $ (0.5)  
Equity method investments         0.0 46.6    
Gross profit $ 33.1 $ 30.2 $ 108.4 $ 171.7 233.9 196.8 $ 230.2  
Fortress                
Schedule of Equity Method Investments [Line Items]                
Remaining interest acquired (as a percent)               55.00%
Fortress                
Schedule of Equity Method Investments [Line Items]                
Sales           0.3    
Gross profit           (0.3)    
Net loss           (5.9)    
Fortress                
Schedule of Equity Method Investments [Line Items]                
Investment in investee         $ 50.0      
Fair value of 45% equity investment         45.00%     45.00%
Net loss in equity investees         $ 1.8 3.9    
Basis difference           27.0    
Equity method investments           45.8    
Other Immaterial Investments                
Schedule of Equity Method Investments [Line Items]                
Net loss in equity investees         1.3      
Equity method investments         $ 0.0 $ 0.8