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Basis of Presentation and Significant Accounting Policies - Government Services (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 31, 2017 | Apr. 30, 2017 | Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Impairment loss (recovery) |  |  | $ 0.0 | $ 26.5 | $ (18.5) | $ 22.5
Government Services | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Impairment loss (recovery) |  | $ (17.4) |  |  |  |
Business combination contingent consideration offer |  | $ 35.0 |  |  |  |
Government Services | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
(Adjustments to) and proceeds from sale of business | $ 35.5 |  |  |  |  |
Gain on sale of government services business | $ 1.2 |  |  |  |  |

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