LONG-TERM DEBT AND OTHER FINANCING ARRANGEMENTS Fixed Rate Notes (Details) - USD ($) $ in Thousands		Mar. 31, 2016		Dec. 31, 2015
Debt Instrument [Line Items]
Senior debt		$ 943,210		$ 906,028
Fair Value		$ 1,094,164		1,123,119
2017 PIK Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[1]	15.00%
Senior debt		$ 371,178	[2]	359,789
Fair Value		502,504		$ 552,338
Principal Amount of Liability Component	[2]	$ 502,504
CME NV and CME BV [Member]
Debt Instrument [Line Items]
Outstanding Shares Pledged, Percentage		100.00%

[1] The 2017 PIK Notes were redeemed on April 8, 2016 and the 2017 Term Loan was repaid on April 7, 2016 with the proceeds from the 2021 Euro Term Loan and cash on hand.

[2] 1) The principal amount represents the original principal amount of US$ 400.0 million plus interest paid in kind by adding such amount to the original principal amount. The 2017 PIK Notes were redeemed on April 8, 2016. See Note 21, "Subsequent Events".