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Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2012 item	Sep. 30, 2006
Standby letters of credit
Commitments and Contingencies
Contingency liability of general and professional insurance program	237.1
Global Linguists Solutions Joint Venture
Commitments and Contingencies
Amount withheld by the U.S. Government for payments due under a contract because of a dispute	19
AECOM Australia
Commitments and Contingencies
Proceeds from initial public offering (IPO)		700
Bank loan		$ 1,400.0
Number of initial public offering investors	770

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Amount billed to customers under long-term contracts or programs but not paid. Excludes amounts due that have been withheld because of retainage provisions in a contract.

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Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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The cash inflow associated with the amount received from entity's first offering of stock to the public.

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