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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jul. 31, 2020 | Jul. 31, 2019 | Jul. 31, 2020 | Jul. 31, 2019
Income Tax Disclosure [Abstract] |  |  |  |
Effective income tax rate (percent) | 29.90% | 18.90% | (444.60%) | 24.50%
Nondeductible impairment |  |  | $ 163.8 |
Effective income tax rate, excluding impairment (percent) |  |  | 28.00% |
Income tax provision | $ (24.0) | $ (8.5) | $ (43.2) | $ (25.8)
Income tax benefit related to deduction for energy efficiency | $ (0.8) |  | (1.2) |
Discrete tax benefit from expiring statute of limitations |  | (2.0) |  | (2.0)
Tax benefit from certain credits |  | $ (0.5) |  |
Increase (decrease) in tax credits, work opportunity tax credit |  |  | 1.9 | 1.3
Unrecognized tax benefits, increase resulting from current period tax positions |  |  |  | 1.4
Income tax benefit related to vesting of share-based compensation awards |  |  |  | $ (1.1)
Social security tax, employer, deferral, CARES Act |  |  | $ 58.0 |

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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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