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Description of Business	12 Months Ended
Description of Business	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	Description of Business Nature of Business and Organization We are a provider of marketplace infrastructure, data services and technology solutions to a broad range of customers including financial institutions, corporations and government entities. These products, which span major asset classes including futures, equities, fixed income and United States, or U.S., residential mortgages, provide our customers with access to mission critical workflow tools that are designed to increase asset class transparency and workflow efficiency. •In our Exchanges segment, we operate regulated marketplaces for the listing, trading and clearing of a broad array of derivatives contracts and financial securities. •In our Fixed Income and Data Services segment, we provide fixed income pricing, reference data, indices and execution services as well as global credit default swap, or CDS, clearing and multi-asset class data delivery solutions. •In our Mortgage Technology segment, we provide an end-to-end technology platform that offers customers comprehensive, digital workflow tools that aim to address the inefficiencies that exist in the U.S. residential mortgage market. We operate marketplaces and provide data services in the U.S., United Kingdom, or U.K., European Union or EU, Canada and Singapore, and offer technology and data solutions to the U.S. mortgage industry.