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Capital Stock (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2013
Dec. 31, 2013
Class A Common Stock (Shares) [Member]
Dec. 31, 2012
Class A Common Stock (Shares) [Member]
Dec. 31, 2013
Class B Common Stock (Shares)
Dec. 31, 2012
Class B Common Stock (Shares)
Dec. 31, 2013
Class B Common Stock, Class B1 [Member]
directors
Dec. 31, 2013
Class B Common Stock, Class B2 [Member]
directors
Dec. 31, 2013
Class B Common Stock, Class B3 [Member]
directors
Dec. 31, 2013
Class B common stock, Class B1, B2, B3 [Member]
directors
Dec. 31, 2013
Core Rights [Member]
Class B Common Stock, Class B1 [Member]
Dec. 31, 2013
Core Rights [Member]
Class B Common Stock, Class B2 [Member]
Dec. 31, 2013
Core Rights [Member]
Class B Common Stock, Class B3 [Member]
Dec. 31, 2013
Core Rights [Member]
Class B Common Stock, Class B4 [Member]
Dec. 31, 2013
Other Voting Rights [Member]
Class B Common Stock (Shares)
Dec. 31, 2013
CME Group Omnibus Stock Plan [Member]
Dec. 31, 2013
CBOT Holdings Long-Term Equity Plan [Member]
Dec. 31, 2013
NYMEX Holdings Omnibus Long-Term Incentive Plan [Member]
Dec. 31, 2013
Director Stock Plan; Class A Shares [Member]
Dec. 31, 2013
Employee Stock Purchase Plan; Class A Shares [Member]
May 31, 2011
Share Repurchases; Class A Common Stock [Member]
Common Stock, Par or Stated Value Per Share   $ 0.01 $ 0.01 $ 0.01 $ 0.01                              
Common stock, voting rights                   6 2 1 1/6 1            
Number of directors 29         3 2 1 6                      
Shares granted, outstanding and exercised                             22,800,000          
Number of shares reserved for awards under the plan                             40,200,000 2,300,000 5,000,000 625,000 500,000  
Shares authorized for future awards, frozen awards                               1,600,000 3,500,000      
Class A shares awarded under Director Stock Plan                                   261,000    
Market value of the shares an Employee Stock Purchase Plan                                     90.00%  
Class A shares Purchased under Employee Stock Purchase Plan                                     177,000  
Share Buyback Program                                       $ 750.0
Number of Shares Company Repurchased                                       4,000,000
Average Purchase Price Per Share                                       $ 54
Total Cost of Repurchased Shares                                       $ 220.4