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Performance Bonds and Guaranty Fund Contributions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024	Dec. 31, 2023
Guarantor Obligations [Line Items]
Average Daily Clearing Settlement			$ 7,300.0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 144,145.8	$ 87,465.1	144,145.8	$ 87,465.1	$ 101,794.1	$ 93,109.7
Margin Deposits And Guaranty Funds Liabilities Current	142,158.0		142,158.0		$ 98,895.4
Other non-operating income (expense)	(1,372.4)	(936.9)	(2,174.8)	(1,901.7)
Investment income	1,518.4	1,044.5	2,411.1	2,115.8
Total Revenues	1,692.0	1,532.5	3,334.3	3,020.4
Interest from Performance Bonds [Member]
Guarantor Obligations [Line Items]
Total Revenues	2,361.2	1,007.6	1,487.6	2,044.3
Expense related to Performance Bonds
Guarantor Obligations [Line Items]
Other non-operating income (expense)	1,374.5	$ 939.4	2,179.3	$ 1,906.9
Federal Reserve Bank Advances
Guarantor Obligations [Line Items]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 131,400.0		$ 131,400.0

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