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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
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
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