Insurance - Insurance Related Balances and Activity (Details) - USD ($) $ in Millions |
Apr. 30, 2018 |
Oct. 31, 2017 |
|---|---|---|
| Liability for Claims and Claims Adjustment Expense [Line Items] | ||
| Insurance recoverables | $ 74.9 | $ 73.1 |
| Claim Types Excluding Medical and Dental | ||
| Liability for Claims and Claims Adjustment Expense [Line Items] | ||
| Insurance claim reserves | 495.7 | 485.6 |
| Medical and Dental Claims | ||
| Liability for Claims and Claims Adjustment Expense [Line Items] | ||
| Insurance claim reserves | $ 10.0 | $ 9.8 |