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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jul. 31, 2021 | Jul. 31, 2020 | Jul. 31, 2021 | Dec. 31, 2020 | Jul. 31, 2020
Income Tax Disclosure [Abstract] |  |  |  |  |
Effective income tax rate (percent) | 9.70% | 29.90% | 28.90% |  | (444.60%)
Provisions for taxes | $ (1.5) | $ 24.0 | $ 37.4 |  | $ 43.2
Nondeductible impairment |  |  |  |  | $ 163.8
Effective income tax rate, excluding impairment |  |  |  |  | 28.00%
Effected tax rate, provision from change of tax reserve | $ 2.9 |  | 3.1 |  |
Effected tax rate, benefit related energy efficiency |  | $ 0.8 | $ 1.1 |  | $ 1.2
Effected tax rate, nondeductible impairment loss, work opportunity tax provision |  |  |  |  | $ 1.9
Social security tax, employer, deferral, CARES Act |  |  |  | $ 132.0 |

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