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Performance Bonds and Guaranty Fund Contributions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022
Guarantor Obligations [Line Items]
Average Daily Clearing Settlement			$ 5,700.0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 101,785.6	$ 89,497.4	101,785.6	$ 89,497.4	$ 93,109.7	$ 137,974.4
Margin Deposits And Guaranty Funds Liabilities Current	99,457.0		99,457.0		$ 90,192.5
Other non-operating income (expense)	(920.0)	(1,155.6)	(2,821.7)	(3,733.7)
Investment income	1,026.8	1,272.5	3,142.6	4,198.4
Total Revenues	1,584.4	1,337.8	4,604.8	4,139.6
Interest from Performance Bonds [Member]
Guarantor Obligations [Line Items]
Total Revenues	991.3	1,246.5	3,035.6	4,042.9
Expense related to Performance Bonds
Guarantor Obligations [Line Items]
Other non-operating income (expense)	922.6	$ 1,160.5	2,829.4	$ 3,756.8
Federal Reserve Bank Advances
Guarantor Obligations [Line Items]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 87,700.0		$ 87,700.0

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