Business Held for Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Oct. 31, 2017
Assets and liabilities of businesses held for sale
Total assets	$ 55,070
Held for Sale
Assets and liabilities of businesses held for sale
Receivables from broker dealers and clearing organizations	3,383
Capitalized software	518
Other assets	413
Total assets	55,070
Payable to brokers, dealers and clearing organizations	50
Accrued expenses and other liabilities	678
Total liabilities	728
Technology \| Held for Sale
Assets and liabilities of businesses held for sale
Intangibles	5,982
Customer relationships \| Held for Sale
Assets and liabilities of businesses held for sale
Intangibles	43,819
Trade names \| Held for Sale
Assets and liabilities of businesses held for sale
Intangibles	$ 955
BondPoint \| ICE
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase price payable		$ 400,000

Amount classified as assets attributable to disposal group held for sale or disposed of.

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