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Revenue from Contracts with Customers - Disaggregation of Revenue by Performance Obligation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Total Revenue	$ 341,173	$ 359,183
Asset Management
Disaggregation of Revenue [Line Items]
Total Revenue	247,689	240,660
Administrative Services
Disaggregation of Revenue [Line Items]
Total Revenue	74,302	72,199
Distribution
Disaggregation of Revenue [Line Items]
Total Revenue	13,028	38,934
Other
Disaggregation of Revenue [Line Items]
Total Revenue	$ 6,154	$ 7,390

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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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