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Performance Bonds and Guaranty Fund Contributions (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Guarantor Obligations [Line Items]            
Average Daily Clearing Settlement     $ 5,400.0      
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 87,465.1 $ 115,126.9 87,465.1 $ 115,126.9 $ 93,109.7 $ 137,974.3
Margin Deposits And Guaranty Funds Liabilities Current 85,670.0   85,670.0   $ 90,192.5  
Other non-operating income (expense) (936.9) (1,425.3) (1,901.7) (2,578.1)    
Investment income 1,044.5 1,568.2 2,115.8 2,925.9    
Total Revenues 1,532.5 1,360.2 3,020.4 2,801.8    
Interest from Performance Bonds [Member]            
Guarantor Obligations [Line Items]            
Total Revenues 1,007.6 1,540.1 2,044.3 2,796.4    
Expense related to Performance Bonds            
Guarantor Obligations [Line Items]            
Other non-operating income (expense) 939.4 $ 1,432.8 1,906.9 $ 2,596.3    
Federal Reserve Bank Advances            
Guarantor Obligations [Line Items]            
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 76,300.0   $ 76,300.0