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Income Taxes - Narrative (Details) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) | Oct. 31, 2021 USD ($) state | Oct. 31, 2020 USD ($) | Oct. 31, 2019 USD ($)
Income Taxes [Line Items] |  |  |  |
Effective tax rate |  | 29.80% | 99.60% | 20.40%
Income tax provision |  | $ 53.5 | $ 53.1 | $ 32.7
Income tax expense related to nonreductive transaction costs |  | 3.0 |  |
Income tax provision (benefit) related to change in tax reserves |  | 2.6 | (1.1) |
State true-ups |  | 1.4 | (5.7) |
Income tax benefit related to deduction for energy efficiency |  | 1.2 | 2.1 |
Work opportunity tax credit, adjustment |  |  | 2.3 |
Nondeductible impairment loss |  |  | $ 163.8 |
Effective tax rate , excluding nondeductible impairment loss |  |  | 24.40% |
Social security tax, employer, deferral, CARES Act | $ 132.0 |  |  |
Tax credits |  | 3.4 |  |
Unrecognized tax benefits that would impact effective tax rate |  | 30.4 | $ 35.5 | 35.3
Maximum decrease in unrecognized tax benefits that is reasonably possible |  | 8.3 |  |
Uncertain tax positions, interest and penalties accrued |  | 1.6 | 1.5 |
Unrecognized tax benefits, interest and penalties expense |  | $ 0.1 | $ 0.4 |
Unrecognized tax benefits, interest and penalties benefit |  |  |  | $ 0.2
Number of states in which entity operates | state |  | 50 |  |
State and Local Jurisdiction |  |  |  |
Income Taxes [Line Items] |  |  |  |
Operating loss carryforwards |  | $ 74.2 |  |

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