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Performance Bonds and Guaranty Fund Contributions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Guarantor Obligations [Line Items]
Average Daily Clearing Settlement			$ 5,700.0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 89,497.4	$ 142,109.8	89,497.4	$ 142,109.8	$ 137,974.4	$ 160,789.9
Margin Deposits And Guaranty Funds Liabilities Current	87,192.1		87,192.1		$ 135,249.2
Other non-operating income (expense)	(1,155.6)	(581.1)	(3,733.7)	(845.1)
Investment income	1,272.5	686.2	4,198.4	1,046.2
Total Revenues	1,337.8	1,227.8	4,139.6	3,811.6
Interest from Performance Bonds [Member]
Guarantor Obligations [Line Items]
Total Revenues	1,246.5	676.8	4,042.9	1,045.9
Expense related to Performance Bonds
Guarantor Obligations [Line Items]
Other non-operating income (expense)	1,160.5	$ 589.7	3,756.8	$ 861.6
Federal Reserve Bank Advances
Guarantor Obligations [Line Items]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 77,800.0		$ 77,800.0

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