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Performance Bonds and Guaranty Fund Contributions (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	Dec. 31, 2023
Guarantor Obligations [Line Items]
Average Daily Clearing Settlement	$ 7,000.0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	122,106.1	$ 95,916.0	$ 101,794.1	$ 93,109.7
Margin Deposits And Guaranty Funds Liabilities Current	120,694.5		$ 98,895.4
Other non-operating income (expense)	(802.4)	(964.8)
Investment income	892.7	1,071.3
Total Revenues	1,642.3	1,487.9
Interest from Performance Bonds [Member]
Guarantor Obligations [Line Items]
Total Revenues	873.6	1,036.7
Expense related to Performance Bonds
Guarantor Obligations [Line Items]
Other non-operating income (expense)	804.8	$ 967.4
Federal Reserve Bank Advances
Guarantor Obligations [Line Items]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 108,000.0

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