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Share-Based Payments - Narratives (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation	$ 0.6	$ 0.5	$ 0.4
Director \| Common Class A
Share-based Compensation Arrangement by Share-based Payment Award
Granted (shares)	18,475	15,384	15,384
Shares issued (usd per share)		$ 11.11	$ 10.74
Director \| Common Class A \| Share-based Payment Arrangement, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award
Granted (shares)	2,700
Shares issued (usd per share)	$ 11.11
Director \| Common Class A \| Share-based Payment Arrangement, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award
Granted (shares)	15,775
Shares issued (usd per share)	$ 11.41
RSU
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period	3 years
Fair value of vested stock	$ 0.3	$ 0.3	$ 0.2
Granted (shares)	42,541	34,295	49,344
Shares issued (usd per share)	$ 11.41	$ 11.11	$ 10.74
RSU \| Subadvisors
Share-based Compensation Arrangement by Share-based Payment Award
Weighted-average remaining contractual term	1 year 8 months 8 days
2015 Equity Investment Plan \| Subadvisors
Share-based Compensation Arrangement by Share-based Payment Award
Stock based compensation not yet recognized	$ 0.5
2015 Equity Investment Plan \| RSU
Share-based Compensation Arrangement by Share-based Payment Award
Maximum shares authorized for share based compensation (shares)	2,000,000
Shares available for grant (shares)	1,838,894