RESTRUCTURING CHARGES - Reconciliation of Beginning and Ending Restructuring Reserve Balances (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Apr. 30, 2019 |
Apr. 30, 2018 |
Apr. 30, 2019 |
Apr. 30, 2018 |
|
| Restructuring Reserve [Roll Forward] | ||||
| October 31, 2018 | $ 4.4 | |||
| Costs incurred and charged to expense | $ 7.5 | $ 6.0 | 11.2 | $ 10.1 |
| Costs paid or otherwise settled | (8.6) | |||
| April 30, 2019 | 7.0 | 7.0 | ||
| Employee Separation Costs | ||||
| Restructuring Reserve [Roll Forward] | ||||
| October 31, 2018 | 4.2 | |||
| Costs incurred and charged to expense | 7.0 | 10.5 | ||
| Costs paid or otherwise settled | (8.2) | |||
| April 30, 2019 | 6.5 | 6.5 | ||
| Other Costs | ||||
| Restructuring Reserve [Roll Forward] | ||||
| October 31, 2018 | 0.2 | |||
| Costs incurred and charged to expense | 0.5 | 0.7 | ||
| Costs paid or otherwise settled | (0.4) | |||
| April 30, 2019 | $ 0.5 | $ 0.5 | ||