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Performance Bonds and Guaranty Fund Contributions (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Guarantor Obligations [Line Items]        
Average Daily Clearing Settlement $ 5,200.0      
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 95,916.0 $ 129,661.0 $ 93,109.7 $ 137,974.3
Margin Deposits And Guaranty Funds Liabilities Current 94,473.9   $ 90,192.5  
Other non-operating income (expense) (964.8) (1,152.8)    
Investment income 1,071.3 1,357.7    
Total Revenues 1,487.9 1,441.6    
Interest from Performance Bonds [Member]        
Guarantor Obligations [Line Items]        
Total Revenues 1,036.7 1,256.3    
Expense related to Performance Bonds        
Guarantor Obligations [Line Items]        
Other non-operating income (expense) 967.4 $ 1,163.5    
Federal Reserve Bank Advances        
Guarantor Obligations [Line Items]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 86,400.0