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Long-Term Investments (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Fair value of investment   $ 721.7
BM&F [Member]
   
Equity Method Investment, Ownership Percentage 5.00%  
Fair value of investment 473.1 690.6
Cost-basis value of investment 356.9  
Bolsa Mexicana De Valores, S A B De C V [Member]
   
Equity Method Investment, Ownership Percentage 2.00%  
Fair value of investment 26.8 29.3
Cost-basis value of investment 17.3  
Bursa Malaysia Derivatives Berhad [Member]
   
Equity Method Investment, Ownership Percentage 25.00%  
Fair value of investment 28.4  
DME Holdings [Member]
   
Equity Method Investment, Ownership Percentage 50.00%  
Fair value of investment 14.1  
S&P/DJI [Member]
   
Equity Method Investment, Ownership Percentage 27.00%  
Fair value of investment $ 948.7