Equity Method Investments	3 Months Ended
Equity Method Investments	Mar. 31, 2012
Equity Method Investments [Abstract]
Equity Method Investments [Text Block]	Equity Method Investments Effective February 1, 2011, we acquired a controlling interest in the Clemenger Group, our affiliate in Australia and New Zealand, increasing our equity ownership to 73.7% from 46.7%. In connection with this transaction we recorded a remeasurement gain of $123.4 million. The difference between the fair value of our shares at the acquisition date and the carrying value of our investment prior to the acquisition resulted in the remeasurement gain. The remeasurement gain was included in office and general expenses for the quarter ended March 31, 2011.

The entire disclosure for equity investment, or group of investments, for which combined disclosure is appropriate, including: (a) the name of each investee and percentage of ownership of common stock, (b) accounting policies for investments in common stock, (c) difference between the amount at which the investment is carried and the amount of underlying equity in net assets and the accounting treatment of the difference, (d) the total fair value of each identified investment for which a market value is available, (e) summarized information as to assets, liabilities, and results of operations of the investees (for investments in unconsolidated subsidiaries, common stock of joint ventures, or other investments using the equity method), and (f) material effects of possible conversions, exercises, or contingent issuances of the investee. Other disclosures include (a) the names of any investee in which the investor owns 20 percent or more of the voting stock and investment is not accounted for using the equity method, and the reasons why not, and (b) the names of any investee in which the investor owns less than 20 percent of the voting stock and the investment is accounted for using the equity method, and the reasons why it is.

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