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LONG-TERM DEBT AND OTHER FINANCING ARRANGEMENTS Guarantee Fees (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Line of Credit Facility [Line Items]      
Loss on extinguishment of debt (Note 5) $ (109) $ 0  
Interest on long-term debt and other financing arrangements $ 13,455 17,629  
CME NV and CME BV [Member]      
Line of Credit Facility [Line Items]      
Outstanding Shares Pledged, Percentage 100.00%    
2018 Euro Term Loan [Member]      
Line of Credit Facility [Line Items]      
Percentage of Debt Hedged by Interest Rate Derivatives [1] 0.14%    
Debt Instrument, Guarantee Fee, Stated Percentage 4.36%    
Debt Instrument, Interest Rate, All-In Rate [1] 6.00%    
Debt Instrument, Interest Rate, Stated Percentage 1.50%    
2019 Euro Term Loan [Member]      
Line of Credit Facility [Line Items]      
Percentage of Debt Hedged by Interest Rate Derivatives 0.31%    
Debt Instrument, Guarantee Fee, Stated Percentage 4.19%    
Debt Instrument, Interest Rate, All-In Rate 6.00%    
Debt Instrument, Interest Rate, Stated Percentage 1.50%    
2021 Euro Term Loan [Member]      
Line of Credit Facility [Line Items]      
Percentage of Debt Hedged by Interest Rate Derivatives 0.28%    
Debt Instrument, Guarantee Fee, Stated Percentage 4.22%    
Debt Instrument, Interest Rate, All-In Rate 6.00%    
Debt Instrument, Interest Rate, Stated Percentage 1.50%    
Guarantee Fee [Member]      
Line of Credit Facility [Line Items]      
Interest on long-term debt and other financing arrangements $ 8,700 $ 13,000  
2021 Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Debt Instrument, Interest Rate, All-In Rate [2],[3] 9.31%    
Debt Instrument, Interest Rate, Stated Percentage [2],[3] 9.31%    
2021 Revolving Credit Facility [Member] | CME NV and CME BV [Member]      
Line of Credit Facility [Line Items]      
Outstanding Shares Pledged, Percentage     100.00%
Minimum [Member] | 2021 Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 6.00%    
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%    
Minimum Required Cash Portion [Member] | 2021 Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 5.00%    
[1] (1) As at March 31, 2018, the 2021 Revolving Credit Facility was undrawn.
[2] As at March 31, 2018, the 2021 Revolving Credit Facility was undrawn.
[3] Based on the three month LIBOR of 2.31% as at March 31, 2018.