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Revenue from Contracts with Customers - Disaggregation of Revenue by Asset Class (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Total Revenue	$ 363,918	$ 364,455	$ 360,712	$ 359,183	$ 358,025	$ 340,340	$ 321,479	$ 307,050	$ 1,448,268	$ 1,326,894	$ 1,135,677
Money Market
Disaggregation of Revenue [Line Items]
Total Revenue									570,815	529,340	414,746
Equity
Disaggregation of Revenue [Line Items]
Total Revenue									551,028	533,749	470,436
Fixed-Income
Disaggregation of Revenue [Line Items]
Total Revenue									193,649	179,102	180,152
Other
Disaggregation of Revenue [Line Items]
Total Revenue									$ 132,776	$ 84,703	$ 70,343

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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.

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