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Revenue from Contracts with Customers - Disaggregation of Revenue by Asset Class (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Total Revenue	$ 311,040	$ 360,712	$ 652,213	$ 719,895
Equity
Disaggregation of Revenue [Line Items]
Total Revenue	171,595	123,328	337,953	260,618
Fixed-income
Disaggregation of Revenue [Line Items]
Total Revenue	57,716	43,691	114,493	90,297
Money market
Disaggregation of Revenue [Line Items]
Total Revenue	49,286	157,430	129,978	308,850
Other
Disaggregation of Revenue [Line Items]
Total Revenue	$ 32,443	$ 36,263	$ 69,789	$ 60,130

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

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