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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) (USD $)
Jun. 30, 2011
Dec. 31, 2010
CME Ltd. shareholders' equity:    
Preferred stock, shares outstanding (in shares) 0 0
Preferred stock, par value (in dollars per share) $ 0.08 $ 0.08
Common Class A [Member]
   
CME Ltd. shareholders' equity:    
Common stock, shares issued (in shares) 56,892,114 56,878,489
Common stock, par value (in dollars per share) $ 0.08 $ 0.08
Common Class B [Member]
   
CME Ltd. shareholders' equity:    
Common stock, shares issued (in shares) 7,500,936 7,490,936
Common stock, par value (in dollars per share) $ 0.08 $ 0.08