Significant Accounting Policies and Recently Issued Accounting Pronouncement - Fulfillment Fees and Management Fees (Details)	12 Months Ended
	Dec. 31, 2019
Significant Accounting Policies and Recently Issued Accounting Pronouncement
Number of days fees are collected from Advised Entities	30 days
Fulfillment Fees
Number of days from purchase fulfillment fees are collected	30 days
Management fees
The period from quarter end that management fees are collected	30 days