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CLEARING OPERATIONS - Clearing participant (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Clearing Operations
Cash Contributions	$ 2,598.9	$ 1,169.2
Non-Cash Contributions	629.9	421.5
Total Contributions	3,228.8	1,590.7
Margin deposits
Clearing Operations
Cash Contributions	1,666.8	600.0
Non-Cash Contributions	495.8	287.0
Total Contributions	2,162.6	887.0
Clearing funds
Clearing Operations
Cash Contributions	143.5	145.9
Non-Cash Contributions	38.3	41.9
Total Contributions	181.8	187.8
Interoperability funds
Clearing Operations
Cash Contributions	788.6	423.3
Non-Cash Contributions	95.8	92.6
Total Contributions	$ 884.4	$ 515.9

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