CLEARING OPERATIONS - Clearing participant (Details) $ in Millions	Sep. 30, 2020 USD ($)
Clearing Operations
Cash Contributions	$ 1,246.2
Non-Cash Contributions	547.1
Total Contributions	1,793.3
Margin deposits
Clearing Operations
Cash Contributions	461.3
Non-Cash Contributions	353.8
Total Contributions	815.1
Clearing funds
Clearing Operations
Cash Contributions	310.6
Non-Cash Contributions	62.4
Total Contributions	373.0
Interoperability funds
Clearing Operations
Cash Contributions	474.3
Non-Cash Contributions	130.9
Total Contributions	$ 605.2