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Stock-Based Payments (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Vesting percentage after one year 25.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 106,300,000    
Employee service share-based compensation, unrecognized compensation costs on nonvested awards, Weighted Average Period of Recognition, years 2 years 4 months    
Share-based compensation arrangement by share-based payment award, options, exercises in period, total intrinsic value $ 19,900,000 $ 29,500,000 $ 29,500,000
Granted performance shares 811,436    
Restricted Class A common stock, fair value $ 59,800,000 43,300,000 40,500,000
Total expense for stock payments $ 66,400,000 $ 61,000,000 $ 55,000,000
Share-based compensation arrangement by share-based payment award, discount from market price 90.00%    
Class A common stock issued to participating employees 19,858 19,756 23,678
Director Stock Plan; Class A Shares [Member]      
Total expense for stock payments $ 2,400,000 $ 2,500,000 $ 2,100,000
Annual award of class A common stock value 100,000    
Annual stipend allowance in shares of stock $ 60,000    
Annual stipend allowance in shares of stock (in shares) 26,439 25,853 33,735
Employee Stock Purchase Plan; Class A Shares [Member]      
Total expense for stock payments $ 200,000    
Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 2 years    
Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years    
Performance Shares [Member]      
Granted performance shares 263,626    
Restricted Class A common stock, fair value $ 25,900,000    
Restricted Stock Units (RSUs) [Member]      
Stock options, granted, shares 8,402    
Class A Common Stock (Shares) [Member]      
Stock options, granted, shares 539,408    
Restricted Class A common stock, fair value $ 59,600,000    
CME Group Omnibus Stock Plan [Member]      
Share-based compensation arrangement by share-based payment award, number of shares reserved 40,200,000    
Share-based compensation arrangement by share-based payment award, number of shares authorized 23,700,000