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Business Transactions (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Jun. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Business Acquisition [Line Items]          
Gain on contribution of Dow Jones Index Asset Group       $ 79.8 $ 0
Proceeds from Divestiture of Businesses 45.9        
Valuation model discount rate       20.00%  
Loss on sale of Credit Market Analysis Ltd.       19.9 0
Reclassification adjustment for loss included in net income 0 18.4 0 18.4 0
S&P/Dow Jones Indices LLC [Member]
         
Business Acquisition [Line Items]          
Equity Method Investments $ 940.8     $ 940.8  
CME Group net of non-controlling interest [Member]
         
Business Acquisition [Line Items]          
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 24.40%     24.40%  
Total CME Group [Member]
         
Business Acquisition [Line Items]          
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 27.00%     27.00%  
Dow Jones [Member]
         
Business Acquisition [Line Items]          
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 10.00%     10.00%