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RESTRUCTURING CHARGES - Reconciliation of Beginning and Ending Restructuring Reserve Balances (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Apr. 30, 2024
Apr. 30, 2023
Apr. 30, 2024
Apr. 30, 2023
Restructuring Reserve [Roll Forward]        
Restructuring reserve, beginning balance     $ 16.8  
Costs incurred and charged to expense $ (6.8) $ 2.4 (1.1) $ 4.8
Costs paid or otherwise settled     (9.5)  
Restructuring reserve, ending balance 6.2   6.2  
Employee Separation Costs        
Restructuring Reserve [Roll Forward]        
Restructuring reserve, beginning balance     16.4  
Costs incurred and charged to expense 0.4   3.3  
Costs paid or otherwise settled     (4.9)  
Restructuring reserve, ending balance 5.8   5.8  
Restructuring costs     (5.7)  
Other Costs        
Restructuring Reserve [Roll Forward]        
Restructuring reserve, beginning balance     0.4  
Costs incurred and charged to expense 1.8   4.6  
Costs paid or otherwise settled     (4.6)  
Restructuring reserve, ending balance $ 0.4   $ 0.4