CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) (USD $)	Jun. 30, 2012	Dec. 31, 2011
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)	76,310,310	56,892,114
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)	0	7,500,936
Common stock, par value (in dollars per share)	$ 0.08	$ 0.08