LONG-TERM DEBT AND OTHER FINANCING ARRANGEMENTS Guarantee Fees (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Nov. 01, 2017	Oct. 27, 2016	Apr. 07, 2016	Dec. 31, 2015
Line of Credit Facility [Line Items]
Interest Expense, Debt		$ 26,139	$ 28,561	$ 85,692	$ 84,251
CME NV and CME BV [Member]
Line of Credit Facility [Line Items]
Outstanding Shares Pledged, Percentage		100.00%		100.00%
2017 PIK Notes [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[1]							15.00%
2017 Term Loan [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[1]							15.00%
2018 Euro Term Loan [Member]
Line of Credit Facility [Line Items]
Percentage of Debt Hedged by Interest Rate Derivatives	[1]	0.21%		0.21%
Debt Instrument, Guarantee Fee, Stated Percentage		6.79%		6.79%
Debt Instrument, Interest Rate, All-In Rate	[1],[2]	8.50%		8.50%
Debt Instrument, Interest Rate, Stated Percentage		1.50%		1.50%
2019 Euro Term Loan [Member]
Line of Credit Facility [Line Items]
Percentage of Debt Hedged by Interest Rate Derivatives		0.31%		0.31%
Debt Instrument, Guarantee Fee, Stated Percentage		6.69%		6.69%
Debt Instrument, Interest Rate, All-In Rate		8.50%		8.50%
Debt Instrument, Interest Rate, Stated Percentage		1.50%		1.50%
2021 Euro Term Loan [Member]
Line of Credit Facility [Line Items]
Percentage of Debt Hedged by Interest Rate Derivatives		0.28%		0.28%
Debt Instrument, Guarantee Fee, Stated Percentage	[2]	8.22%		8.22%
Debt Instrument, Interest Rate, All-In Rate	[2]	10.00%		10.00%
Debt Instrument, Interest Rate, Stated Percentage		1.50%		1.50%
Guarantee Fee [Member]
Line of Credit Facility [Line Items]
Interest Expense, Debt		$ 20,400	$ 4,800	$ 49,300	$ 14,400
2021 Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Interest Rate, All-In Rate	[3]	10.00%		10.00%
Debt Instrument, Interest Rate, Stated Percentage	[3]	10.00%		10.00%
2021 Revolving Credit Facility [Member] | CME NV and CME BV [Member]
Line of Credit Facility [Line Items]
Outstanding Shares Pledged, Percentage									100.00%
Scenario, Forecast [Member] | 2018 Euro Term Loan [Member]
Line of Credit Facility [Line Items]
Percentage of Debt Hedged by Interest Rate Derivatives						0.14%
Scenario, Forecast [Member] | 2021 Euro Term Loan [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Guarantee Fee, Stated Percentage	[3]						7.22%
Debt Instrument, Interest Rate, All-In Rate	[3]						9.00%
Minimum [Member] | 2021 Euro Term Loan [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Interest Rate, All-In Rate		7.00%		7.00%
Minimum [Member] | 2021 Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		7.00%		7.00%
Minimum Required Cash Portion [Member] | 2021 Euro Term Loan [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Interest Rate, All-In Rate		5.00%		5.00%
Minimum Required Cash Portion [Member] | 2021 Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.00%		5.00%

[1] (1) Effective until November 1, 2017. From November 1, 2017 through maturity on November 1, 2018, the rate fixed pursuant to interest rate hedges will decrease to 0.14%, with a corresponding increase in the guarantee fee rate, such that the all-in borrowing rate remains 8.50%.

[2] (2) As at September 30, 2016. With effect from October 27, 2016 the guarantee fee rate and the all-in borrowing rate will decrease to 7.22% and 9.00%, respectively.

[3] (3) As at September 30, 2016, the aggregate principal amount available under the 2021 Revolving Credit Facility was undrawn.