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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Apr. 30, 2019 | Apr. 30, 2018 | Jan. 31, 2018 | Apr. 30, 2019 | Apr. 30, 2018 | Oct. 31, 2018
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |  |  |  |
Income tax expense (benefit) to finalize tax effects of 2017 Act | $ (4.4) |  |  |  |  |
Effective income tax rate expense (benefit) | 4.50% | (12.90%) |  | (1.70%) | 147.80% |
Change of provisional tax expenses related to 2017 Act |  |  | $ 202.0 |  |  |
Discrete tax benefits | $ 23.1 |  |  |  |  |
Unrecognized tax benefits | 49.1 |  |  | $ 49.1 |  | $ 68.9
Unrecognized tax benefits that could be settled | $ 3.1 |  |  | $ 3.1 |  |

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- Definition Effective Income Tax Rate Reconciliation, Tax Audit Settlement, Tax Cuts And Jobs Act, And Share-Based Compensation Excess Tax Benefit + References No definition available. + Details
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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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