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CLEARING OPERATIONS - Clearing participant (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Clearing Operations
Cash Contributions	$ 2,437.5	$ 1,190.6
Non-Cash Contributions	936.9	645.9
Total Contributions	3,374.4	1,836.5
Margin deposits
Clearing Operations
Cash Contributions	1,041.7	319.5
Non-Cash Contributions	744.7	401.0
Total Contributions	1,786.4	720.5
Clearing funds
Clearing Operations
Cash Contributions	146.5	492.6
Non-Cash Contributions	49.1	69.7
Total Contributions	195.6	562.3
Interoperability funds
Clearing Operations
Cash Contributions	1,249.3	378.5
Non-Cash Contributions	143.1	175.2
Total Contributions	$ 1,392.4	$ 553.7

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