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Concentration Risk - Schedule of Revenue Concentration by Asset Class (Details) - Product Concentration Risk	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Money Market Assets
Concentration Risk [Line Items]
Concentration risk	40.00%	40.00%	37.00%
Equity Assets
Concentration Risk [Line Items]
Concentration risk	38.00%	40.00%	41.00%
Fixed-Income Assets
Concentration Risk [Line Items]
Concentration risk	13.00%	14.00%	16.00%

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- Definition

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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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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