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GOODWILL AND OTHER INTANGIBLE ASSETS - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Jul. 31, 2019
Jul. 31, 2018
Feb. 11, 2019
Goodwill [Line Items]          
Goodwill acquired     $ 791.7    
Amortization of intangible assets $ 17.1 $ 3.8 35.5 $ 11.5  
Amortization expense, 2019 52.9   52.9    
Future amortization expense, 2020 69.1   69.1    
Future amortization expense, 2021 66.8   66.8    
Future amortization expense, 2022 59.2   59.2    
Future amortization expense, 2023 56.4   56.4    
Paper Packaging & Services          
Goodwill [Line Items]          
Goodwill, Gross 769.4   769.4    
Goodwill acquired     769.4    
Rigid Industrial Packaging & Services          
Goodwill [Line Items]          
Goodwill acquired     22.3    
Caraustar          
Goodwill [Line Items]          
Goodwill, Gross 769.4   769.4   $ 752.5
Intangibles 725.5   725.5   $ 717.1
Caraustar | Paper Packaging & Services          
Goodwill [Line Items]          
Intangibles 725.5   725.5    
Caraustar | Rigid Industrial Packaging & Services          
Goodwill [Line Items]          
Intangibles $ 24.6   $ 24.6