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CONSOLIDATED STATEMENTS OF INCOME - USD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Revenues      
Total Revenues $ 6,130.1 $ 5,578.9 $ 5,019.4
Expenses      
Compensation and benefits 850.3 828.6 753.1
Technology 255.8 218.7 188.6
Professional fees and outside services 132.7 144.4 137.4
Amortization of purchased intangibles 221.7 226.6 227.7
Depreciation and amortization 115.1 126.0 134.9
Licensing and other fee agreements 355.4 322.8 320.0
Other 267.6 276.1 241.8
Total Expenses 2,198.6 2,143.2 2,003.5
Operating Income 3,931.5 3,435.7 3,015.9
Non-Operating Income (Expense)      
Investment income 4,079.1 5,275.3 2,198.4
Interest and other borrowing costs (160.9) (159.4) (162.7)
Equity in net earnings (losses) of unconsolidated subsidiaries 350.9 296.9 301.1
Other income (expense) (3,659.2) (4,694.9) (1,862.4)
Total Non-Operating 609.9 717.9 474.4
Income before Income Taxes 4,541.4 4,153.6 3,490.3
Income tax provision 1,015.6 927.4 799.3
Net income 3,525.8 3,226.2 2,691.0
Net income attributable to CME Group 3,525.8 3,226.2  
Net Income Attributable to Common Shareholders of CME Group $ 3,481.5 $ 3,185.6 $ 2,657.2
Earnings per Common Share Attributable to CME Group:      
Basic $ 9.69 $ 8.87 $ 7.41
Diluted $ 9.67 $ 8.86 $ 7.40
Weighted Average Number of Common Shares:      
Basic 359,389 359,023 358,713
Diluted 359,944 359,500 359,181
Clearing and Transaction Fees [Member]      
Revenues      
Total Revenues $ 4,988.2 $ 4,588.5 $ 4,142.7
MarketData [Member]      
Revenues      
Total Revenues 710.2 663.7 610.9
OtherRevenue [Member]      
Revenues      
Total Revenues $ 431.7 $ 326.7 $ 265.8