Revenues from Contracts with Customers (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Total revenue	$ 2,125,151	$ 1,919,793	$ 1,991,037
United States
Disaggregation of Revenue [Line Items]
Total revenue	1,816,650	1,640,109	1,623,022
United Kingdom
Disaggregation of Revenue [Line Items]
Total revenue	162,744	147,800	242,071
Canada
Disaggregation of Revenue [Line Items]
Total revenue	46,320	45,626	48,419
Ireland
Disaggregation of Revenue [Line Items]
Total revenue	69,329	62,524	60,365
Luxembourg
Disaggregation of Revenue [Line Items]
Total revenue	30,108	23,734	16,898
Other
Disaggregation of Revenue [Line Items]
Total revenue			262
Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Total revenue	417,501	416,358	447,282
Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Total revenue	435,917	417,368	428,179
Investment operations fees
Disaggregation of Revenue [Line Items]
Total revenue	749,992	619,890	579,813
Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Total revenue	303,102	255,248	253,033
Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Total revenue	117,632	117,456	119,670
Professional services fees
Disaggregation of Revenue [Line Items]
Total revenue	26,618	31,375	107,029
Account fees and other
Disaggregation of Revenue [Line Items]
Total revenue	74,389	62,098	56,031
Investment Managers
Disaggregation of Revenue [Line Items]
Total revenue	728,390	645,254	599,661
Investment Managers | United States
Disaggregation of Revenue [Line Items]
Total revenue	655,051	583,107	545,297
Investment Managers | United Kingdom
Disaggregation of Revenue [Line Items]
Total revenue	0	94	0
Investment Managers | Canada
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Investment Managers | Ireland
Disaggregation of Revenue [Line Items]
Total revenue	43,231	38,319	37,466
Investment Managers | Luxembourg
Disaggregation of Revenue [Line Items]
Total revenue	30,108	23,734	16,898
Investment Managers | Other
Disaggregation of Revenue [Line Items]
Total revenue			0
Investment Managers | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Total revenue	363	401	396
Investment Managers | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Investment Managers | Investment operations fees
Disaggregation of Revenue [Line Items]
Total revenue	691,953	611,126	572,187
Investment Managers | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Total revenue	5,042	4,261	3,077
Investment Managers | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Total revenue	19	73	70
Investment Managers | Professional services fees
Disaggregation of Revenue [Line Items]
Total revenue	3,572	3,885	3,206
Investment Managers | Account fees and other
Disaggregation of Revenue [Line Items]
Total revenue	27,441	25,508	20,725
Private Banks
Disaggregation of Revenue [Line Items]
Total revenue	541,414	496,317	570,010
Private Banks | United States
Disaggregation of Revenue [Line Items]
Total revenue	355,887	325,543	311,784
Private Banks | United Kingdom
Disaggregation of Revenue [Line Items]
Total revenue	125,745	113,221	199,294
Private Banks | Canada
Disaggregation of Revenue [Line Items]
Total revenue	40,564	39,974	43,108
Private Banks | Ireland
Disaggregation of Revenue [Line Items]
Total revenue	19,218	17,579	15,824
Private Banks | Luxembourg
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Private Banks | Other
Disaggregation of Revenue [Line Items]
Total revenue			0
Private Banks | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Total revenue	133,210	127,388	125,430
Private Banks | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Total revenue	4,302	3,091	2,187
Private Banks | Investment operations fees
Disaggregation of Revenue [Line Items]
Total revenue	2,270	1,572	1,410
Private Banks | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Total revenue	290,825	244,910	242,916
Private Banks | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Total revenue	87,938	89,708	92,377
Private Banks | Professional services fees
Disaggregation of Revenue [Line Items]
Total revenue	19,747	26,291	102,012
Private Banks | Account fees and other
Disaggregation of Revenue [Line Items]
Total revenue	3,122	3,357	3,678
Private Banks | Professional services fees, one-time early termination fees
Disaggregation of Revenue [Line Items]
Total revenue		10,457	88,000
Investment Advisors
Disaggregation of Revenue [Line Items]
Total revenue	509,408	436,298	447,766
Investment Advisors | United States
Disaggregation of Revenue [Line Items]
Total revenue	509,408	436,298	447,766
Investment Advisors | United Kingdom
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Investment Advisors | Canada
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Investment Advisors | Ireland
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Investment Advisors | Luxembourg
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Investment Advisors | Other
Disaggregation of Revenue [Line Items]
Total revenue			0
Investment Advisors | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Total revenue	233,992	239,244	263,266
Investment Advisors | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Total revenue	197,638	174,418	162,762
Investment Advisors | Investment operations fees
Disaggregation of Revenue [Line Items]
Total revenue	51,550	1,490	0
Investment Advisors | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Total revenue	5,570	5,035	5,956
Investment Advisors | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Total revenue	335	0	0
Investment Advisors | Professional services fees
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Investment Advisors | Account fees and other
Disaggregation of Revenue [Line Items]
Total revenue	20,323	16,111	15,782
Institutional Investors
Disaggregation of Revenue [Line Items]
Total revenue	285,723	289,708	323,353
Institutional Investors | United States
Disaggregation of Revenue [Line Items]
Total revenue	236,088	242,945	267,928
Institutional Investors | United Kingdom
Disaggregation of Revenue [Line Items]
Total revenue	36,999	34,485	42,777
Institutional Investors | Canada
Disaggregation of Revenue [Line Items]
Total revenue	5,756	5,652	5,311
Institutional Investors | Ireland
Disaggregation of Revenue [Line Items]
Total revenue	6,880	6,626	7,075
Institutional Investors | Luxembourg
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Institutional Investors | Other
Disaggregation of Revenue [Line Items]
Total revenue			262
Institutional Investors | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Total revenue	48,215	47,943	56,714
Institutional Investors | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Total revenue	215,464	223,212	247,113
Institutional Investors | Investment operations fees
Disaggregation of Revenue [Line Items]
Total revenue	12	0	0
Institutional Investors | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Total revenue	1,631	1,000	1,044
Institutional Investors | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Total revenue	8,172	10,118	11,425
Institutional Investors | Professional services fees
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Institutional Investors | Account fees and other
Disaggregation of Revenue [Line Items]
Total revenue	12,229	7,435	7,057
Investments in New Businesses
Disaggregation of Revenue [Line Items]
Total revenue	60,216	52,216	50,247
Investments in New Businesses | United States
Disaggregation of Revenue [Line Items]
Total revenue	60,216	52,216	50,247
Investments in New Businesses | United Kingdom
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Investments in New Businesses | Canada
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Investments in New Businesses | Ireland
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Investments in New Businesses | Luxembourg
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Investments in New Businesses | Other
Disaggregation of Revenue [Line Items]
Total revenue			0
Investments in New Businesses | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Total revenue	1,721	1,382	1,476
Investments in New Businesses | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Total revenue	18,513	16,647	16,117
Investments in New Businesses | Investment operations fees
Disaggregation of Revenue [Line Items]
Total revenue	4,207	5,702	6,216
Investments in New Businesses | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Total revenue	34	42	40
Investments in New Businesses | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Total revenue	21,168	17,557	15,798
Investments in New Businesses | Professional services fees
Disaggregation of Revenue [Line Items]
Total revenue	3,299	1,199	1,811
Investments in New Businesses | Account fees and other
Disaggregation of Revenue [Line Items]
Total revenue	$ 11,274	$ 9,687	$ 8,789