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Revenues from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Revenues	$ 581,443	$ 455,686
United States
Disaggregation of Revenue [Line Items]
Revenues	419,629	385,991
United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	129,412	40,394
Canada
Disaggregation of Revenue [Line Items]
Revenues	13,042	12,784
Ireland
Disaggregation of Revenue [Line Items]
Revenues	16,188	16,388
Luxembourg
Disaggregation of Revenue [Line Items]
Revenues	3,054
Other
Disaggregation of Revenue [Line Items]
Revenues	118	129
Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	119,428	119,694
Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	114,849	108,516
Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	145,739	125,530
Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	56,455	50,876
Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	36,327	31,516
Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	93,118	5,554
Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	15,527	14,000
Private Banks
Disaggregation of Revenue [Line Items]
Revenues	213,548	117,608
Private Banks | United States
Disaggregation of Revenue [Line Items]
Revenues	80,886	75,095
Private Banks | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	116,663	26,665
Private Banks | Canada
Disaggregation of Revenue [Line Items]
Revenues	11,800	11,482
Private Banks | Ireland
Disaggregation of Revenue [Line Items]
Revenues	4,199	4,366
Private Banks | Luxembourg
Disaggregation of Revenue [Line Items]
Revenues	0
Private Banks | Other
Disaggregation of Revenue [Line Items]
Revenues	0	0
Private Banks | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	33,118	32,564
Private Banks | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	255	473
Private Banks | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	360	369
Private Banks | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	56,455	50,876
Private Banks | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	29,559	27,810
Private Banks | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	92,729	4,407
Private Banks | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	1,072	1,109
Private Banks | Professional services fees, one-time early termination fees
Disaggregation of Revenue [Line Items]
Revenues	88,000
Investment Advisors
Disaggregation of Revenue [Line Items]
Revenues	119,230	113,294
Investment Advisors | United States
Disaggregation of Revenue [Line Items]
Revenues	119,230	113,294
Investment Advisors | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Advisors | Canada
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Advisors | Ireland
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Advisors | Luxembourg
Disaggregation of Revenue [Line Items]
Revenues	0
Investment Advisors | Other
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Advisors | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	71,993	72,654
Investment Advisors | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	42,008	34,714
Investment Advisors | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Advisors | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Advisors | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Advisors | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Advisors | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	5,229	5,926
Institutional Investors
Disaggregation of Revenue [Line Items]
Revenues	86,839	84,499
Institutional Investors | United States
Disaggregation of Revenue [Line Items]
Revenues	70,563	66,720
Institutional Investors | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	12,749	13,729
Institutional Investors | Canada
Disaggregation of Revenue [Line Items]
Revenues	1,242	1,302
Institutional Investors | Ireland
Disaggregation of Revenue [Line Items]
Revenues	2,167	2,619
Institutional Investors | Luxembourg
Disaggregation of Revenue [Line Items]
Revenues	0
Institutional Investors | Other
Disaggregation of Revenue [Line Items]
Revenues	118	129
Institutional Investors | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	13,866	14,088
Institutional Investors | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	68,460	69,943
Institutional Investors | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	0	0
Institutional Investors | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0
Institutional Investors | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	3,110	0
Institutional Investors | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	0	0
Institutional Investors | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	1,403	468
Investment Managers
Disaggregation of Revenue [Line Items]
Revenues	156,901	136,419
Investment Managers | United States
Disaggregation of Revenue [Line Items]
Revenues	144,025	127,016
Investment Managers | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Managers | Canada
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Managers | Ireland
Disaggregation of Revenue [Line Items]
Revenues	9,822	9,403
Investment Managers | Luxembourg
Disaggregation of Revenue [Line Items]
Revenues	3,054
Investment Managers | Other
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Managers | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	84	59
Investment Managers | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Managers | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	145,379	125,161
Investment Managers | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investment Managers | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	3,658	3,706
Investment Managers | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	389	1,147
Investment Managers | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	7,391	6,346
Investments In New Businesses
Disaggregation of Revenue [Line Items]
Revenues	4,925	3,866
Investments In New Businesses | United States
Disaggregation of Revenue [Line Items]
Revenues	4,925	3,866
Investments In New Businesses | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investments In New Businesses | Canada
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investments In New Businesses | Ireland
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investments In New Businesses | Luxembourg
Disaggregation of Revenue [Line Items]
Revenues	0
Investments In New Businesses | Other
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investments In New Businesses | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	367	329
Investments In New Businesses | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	4,126	3,386
Investments In New Businesses | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investments In New Businesses | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investments In New Businesses | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investments In New Businesses | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	0	0
Investments In New Businesses | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	$ 432	$ 151

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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