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Income Taxes (Narrative) (Details) £ in Millions, $ in Millions |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jan. 19, 2018 GBP (£) | Dec. 20, 2017 GBP (£) | Jul. 31, 2018 USD ($) | Jan. 31, 2018 USD ($) | Jul. 31, 2017 | Jul. 31, 2018 USD ($) | Jul. 31, 2017 | Oct. 31, 2018 | Oct. 31, 2017 USD ($)
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |
Repatriation tax |  |  | $ 174.1 | $ 177.9 |  |  |  |  |
Repatriation tax, payment periods |  |  |  |  |  | 8 years |  |  |
Transition tax rate for foreign cash and certain other net current assets |  |  |  | 15.50% |  |  |  |  |
Transition tax rate on remaining deferred foreign income |  |  |  | 8.00% |  |  |  |  |
Provisional tax expense |  |  |  | $ 13.2 |  |  |  |  |
Current state and local tax expense (benefit) |  |  | 7.5 | 8.1 |  |  |  |  |
Withholding taxes relating to the unremitted foreign earnings |  |  | $ 1.9 | $ 2.8 |  | $ 1.9 |  |  |
Effective income tax rate |  |  | 11.50% |  | 3.80% | 82.10% | 4.40% |  |
Change of provisional tax expenses related to 2017 Act |  |  | $ (5.3) |  |  | $ 196.7 |  |  |
Unrecognized tax benefits |  |  | 65.3 |  |  | 65.3 |  |  | $ 59.9
Unrecognized tax benefits that could be settled |  |  | $ 25.3 |  |  | $ 25.3 |  |  |
UNITED KINGDOM |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |
Diverted profit tax | £ |  | £ 31.0 |  |  |  |  |  |  |
Payment for DPT | £ | £ 31.0 |  |  |  |  |  |  |  |
Scenario, Forecast |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |
Blended tax rate |  |  |  |  |  |  |  | 23.34% |

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