INDENTURE CONVENANTS (Details)	3 Months Ended			6 Months Ended						3 Months Ended			6 Months Ended						3 Months Ended			6 Months Ended				3 Months Ended			6 Months Ended
	Jun. 30, 2011 USD ($)		Jun. 30, 2010 USD ($)	Jun. 30, 2011 USD ($)		Jun. 30, 2010 USD ($)	Jun. 30, 2011 EUR (€)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Jun. 30, 2011 Issuer and Restricted Subsidiary [Member] USD ($)		Jun. 30, 2010 Issuer and Restricted Subsidiary [Member] USD ($)	Jun. 30, 2011 Issuer and Restricted Subsidiary [Member] USD ($)		Jun. 30, 2010 Issuer and Restricted Subsidiary [Member] USD ($)	Dec. 31, 2010 Issuer and Restricted Subsidiary [Member] USD ($)	Jun. 30, 2011 Issuer and Restricted Subsidiary [Member] Less than [Member] times	Jun. 30, 2011 Issuer and Restricted Subsidiary [Member] Greater than [Member] times	Jun. 30, 2011 Unrestricted Subsidiary [Member] USD ($)		Jun. 30, 2010 Unrestricted Subsidiary [Member] USD ($)	Jun. 30, 2011 Unrestricted Subsidiary [Member] USD ($)		Jun. 30, 2010 Unrestricted Subsidiary [Member] USD ($)	Dec. 31, 2010 Unrestricted Subsidiary [Member] USD ($)	Jun. 30, 2011 Intergroup Elimination [Member] USD ($)		Jun. 30, 2010 Intergroup Elimination [Member] USD ($)	Jun. 30, 2011 Intergroup Elimination [Member] USD ($)		Jun. 30, 2010 Intergroup Elimination [Member] USD ($)	Dec. 31, 2010 Intergroup Elimination [Member] USD ($)
Indenture Convenants [Line Items]
Coverage Ratio																	2.0	2.25
Restricted Payment amount	$ 115,600,000			$ 115,600,000			€ 80,000,000
Cash Transferred Amount	162,900,000			162,900,000
Cash Remaining Balance Amount	21,500,000			21,500,000
Net revenues	249,656,000		201,726,000	422,428,000		345,367,000				247,754,000		201,965,000	419,377,000		345,088,000				1,943,000		990,000	3,092,000		1,944,000		(41,000)		(1,229,000)	(41,000)		(1,665,000)
Depreciation of property, plant and equipment	14,493,000		13,075,000	27,910,000		27,189,000				13,960,000		12,151,000	26,595,000		25,371,000				533,000		924,000	1,315,000		1,818,000		0		0	0		0
Amortization of Intangible Assets	7,809,000		6,545,000	15,436,000		11,694,000				7,809,000		6,545,000	15,436,000		11,694,000				0		0	0		0		0		0	0		0
Operating Income (Loss)	39,473,000		25,452,000	31,808,000		6,319,000				41,158,000		31,876,000	37,042,000		22,793,000				(1,685,000)		(6,403,000)	(5,234,000)		(16,438,000)		0		(21,000)	0		(36,000)
Net (loss) / income attributable to CME Ltd.	968,000		165,169,000	(20,146,000)		122,875,000				4,859,000		(107,789,000)	(9,800,000)		(134,726,000)				(3,891,000)		272,979,000	(10,346,000)		257,637,000		0		(21,000)	0		(36,000)
Cash and cash equivalents	197,505,000		315,257,000	197,505,000		315,257,000		244,050,000	445,954,000	175,873,000			175,873,000			219,789,000			21,632,000			21,632,000			24,261,000	0			0			0
Third Party Debt	1,406,422,000	[1]		1,406,422,000	[1]			1,359,784,000		1,406,422,000	[1]		1,406,422,000	[1]		1,359,330,000			0	[1]		0	[1]		454,000	0	[1]		0	[1]		0
Total assets	3,173,427,000			3,173,427,000				2,940,550,000		3,460,292,000			3,460,292,000			3,212,077,000			26,498,000			26,498,000			37,942,000	(313,363,000)			(313,363,000)			(309,469,000)
Total CME Ltd. shareholders' equity	$ 1,345,520,000			$ 1,345,520,000				$ 1,226,879,000		$ 1,525,534,000			$ 1,525,534,000			$ 1,493,511,000			$ 22,108,000			$ 22,108,000			$ (36,981,000)	$ (202,122,000)			$ (202,122,000)			$ (229,651,000)

[1] Third party debt is defined as credit facilities and capital leases or debt with entities that are not part of the CME Ltd. consolidated group.