Revenue (Major Customers) (Details) - Revenues - Customer concentration risk - Fidelity	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Major Customers
Revenue as a percentage of the company's total	15.00%	17.00%	17.00%
Envestnet Wealth Solutions
Major Customers
Revenue as a percentage of the company's total	19.00%	21.00%	22.00%

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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