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Consolidated Statements Of Income - USD ($)
shares in Thousands, $ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Revenues    
Total Revenues $ 1,487.9 $ 1,441.6
Expenses    
Compensation and benefits 206.0 204.5
Technology 59.4 51.3
Professional fees and outside services 33.1 38.3
Amortization of purchased intangibles 55.2 56.8
Depreciation and amortization 30.1 31.9
Licensing and other fee agreements 87.9 84.7
Other 56.6 60.4
Total Expenses 528.3 527.9
Operating Income 959.6 913.7
Non-Operating Income (Expense)    
Investment income 1,071.3 1,357.7
Interest and other borrowing costs (39.9) (39.9)
Equity in net earnings of unconsolidated subsidiaries 87.2 78.2
Other non-operating income (expense) (964.8) (1,152.8)
Total Non-Operating Income (Expense) 153.8 243.2
Income before Income Taxes 1,113.4 1,156.9
Income tax provision 258.2 273.1
Net Income 855.2 883.8
Net Income Attributable to Common Shareholders of CME Group $ 844.4 $ 872.7
Earnings per Share Attributable to Common Shareholders of CME Group:    
Basic (in dollars per share) $ 2.35 $ 2.43
Diluted (in dollars per share) $ 2.35 $ 2.43
Weighted Average Number of Common Shares:    
Basic (in shares) 359,258 358,933
Diluted (in shares) 359,833 359,313
Clearing and transaction fees [Member]    
Revenues    
Total Revenues $ 1,208.9 $ 1,200.2
Market data and information services    
Revenues    
Total Revenues 175.4 165.8
Other    
Revenues    
Total Revenues $ 103.6 $ 75.6