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Acquisitions - GCA Consideration Transferred (Details) - GCA Holding Corp. $ / shares in Units, shares in Millions, $ in Millions | Sep. 01, 2017 USD ($) $ / shares shares
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Business Acquisition, Equity Interests Issued or Issuable [Line Items] |
Fair value of ABM common stock at closing | $ 421.3
Cash consideration | 839.9
Total consideration transferred | $ 1,261.3
Common Stock |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |
Shares of ABM common stock, net of shares withheld for taxes (in shares) | shares | 9.4
ABM common stock closing market price at acquisition date (usd per share) | $ / shares | $ 44.63

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