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RESTRUCTURING CHARGES - Reconciliation of Beginning and Ending Restructuring Reserve Balances (Details) - USD ($)
$ in Millions
 3 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Restructuring Reserve [Roll Forward]    
Restructuring reserve, beginning balance $ 21.6  
Costs incurred and charged to expense 3.1 $ 3.3
Costs paid or otherwise settled (5.3)  
Restructuring reserve, ending balance 19.4  
Employee Separation Costs    
Restructuring Reserve [Roll Forward]    
Restructuring reserve, beginning balance 17.9  
Costs incurred and charged to expense 1.5  
Costs paid or otherwise settled (3.5)  
Restructuring reserve, ending balance 15.9  
Other Costs    
Restructuring Reserve [Roll Forward]    
Restructuring reserve, beginning balance 3.7  
Costs incurred and charged to expense 1.6  
Costs paid or otherwise settled (1.8)  
Restructuring reserve, ending balance $ 3.5