Insurance - Instruments Used to Collateralize Insurance Obligations (Details) - USD ($) $ in Millions |
Jan. 31, 2019 |
Oct. 31, 2018 |
|---|---|---|
| Letters Of Credit [Line Items] | ||
| Instruments used to collateralize insurance obligations | $ 233.5 | $ 233.9 |
| Standby letters of credit | ||
| Letters Of Credit [Line Items] | ||
| Instruments used to collateralize insurance obligations | 143.5 | 144.1 |
| Surety bonds | ||
| Letters Of Credit [Line Items] | ||
| Instruments used to collateralize insurance obligations | 89.2 | 89.2 |
| Restricted insurance deposits | ||
| Letters Of Credit [Line Items] | ||
| Instruments used to collateralize insurance obligations | $ 0.8 | $ 0.6 |