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LONG-TERM DEBT AND OTHER FINANCING ARRANGEMENTS Long-term Debt Additional Information (Details)
$ in Thousands, € in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
EUR (€)
Debt Instrument [Line Items]    
Noncontrolling Interest, Ownership Percentage by Parent 100.00% 100.00%
Minimum [Member]    
Debt Instrument [Line Items]    
Debt instrument basis spread on variable rate 1.10%  
Maximum [Member]    
Debt Instrument [Line Items]    
Debt instrument basis spread on variable rate 1.90%  
2021 Euro Loan [Member]    
Debt Instrument [Line Items]    
Principal Amount of Liability Component $ 240,834 € 210.3
Debt Instrument, Interest Rate, All-In Rate 3.25% 3.25%
2023 Euro Loan [Member]    
Debt Instrument [Line Items]    
Principal Amount of Liability Component $ 536,776 € 468.8
Debt Instrument, Interest Rate, All-In Rate 3.75% 3.75%
CME NV and CME BV [Member]    
Debt Instrument [Line Items]    
Outstanding Shares Pledged, Percentage 100.00% 100.00%