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Description of Business	9 Months Ended
Description of Business	Sep. 30, 2011
Description of Business [Abstract]
Nature of Operations [Text Block]	DESCRIPTION OF BUSINESS Duff & Phelps Corporation (the “Company”) is a leading provider of independent financial advisory and investment banking services. Its mission is to help its clients protect, maximize and recover value by providing independent advice on issues involving highly technical and complex assessments in the areas of valuation, transactions, financial restructuring, disputes and taxation. The Company believes that the Duff & Phelps brand is associated with experienced professionals who give trusted guidance in a responsive manner. The Company serves a global client base through offices in 24 cities, comprised of offices in 17 U.S. cities, including New York, Chicago, Houston and Los Angeles, and seven international offices located in Amsterdam, London, Munich, Paris, Shanghai, Tokyo and Toronto.