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Performance Bonds and Guaranty Fund Contributions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 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	$ 115,126.9	$ 140,315.0	115,126.9	$ 140,315.0	$ 137,974.3	$ 160,789.9
Margin Deposits And Guaranty Funds Liabilities Current	113,241.6		113,241.6		$ 135,249.2
Other non-operating income (expense)	(1,425.3)	(217.3)	(2,578.1)	(264.0)
Investment income	1,568.2	286.9	2,925.9	360.0
Total Revenues	1,360.2	1,237.2	2,801.8	2,583.8
Interest from Performance Bonds [Member]
Guarantor Obligations [Line Items]
Total Revenues	1,540.1	295.5	2,796.4	369.1
Expense related to Performance Bonds
Guarantor Obligations [Line Items]
Other non-operating income (expense)	1,432.8	$ 223.5	2,596.3	$ 271.9
Federal Reserve Bank Advances
Guarantor Obligations [Line Items]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 100,300.0		$ 100,300.0

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