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Acquisitions - GCA Consideration Transferred (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  | 12 Months Ended
--- | --- | ---
Sep. 01, 2017 | Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2017
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |
Fair value of ABM common stock at closing |  | $ 0.0 | $ 0.0 | $ 421.3
GCA Holding Corp. |  |  |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |
Fair value of ABM common stock at closing | $ 421.3 |  |  |
Cash consideration | 837.5 |  |  |
Total consideration transferred | $ 1,258.8 |  |  |
GCA Holding Corp. | Common Stock |  |  |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |
Shares of ABM common stock, net of shares withheld for taxes (in shares) | 9.4 |  |  |
ABM common stock closing market price at acquisition date (usd per share) | $ 44.63 |  |  |

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