Revenues from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Revenues	$ 469,119	$ 581,443
United States
Disaggregation of Revenue [Line Items]
Revenues	400,200	419,629
United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	36,941	129,412
Canada
Disaggregation of Revenue [Line Items]
Revenues	11,459	13,042
Ireland
Disaggregation of Revenue [Line Items]
Revenues	15,130	16,188
Luxembourg
Disaggregation of Revenue [Line Items]
Revenues	5,389	3,054
Other
Disaggregation of Revenue [Line Items]
Revenues		118
Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	104,573	119,428
Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	104,304	114,849
Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	147,540	145,739
Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	57,585	56,455
Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	33,589	36,327
Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	5,600	93,118
Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	15,928	15,527
Private Banks
Disaggregation of Revenue [Line Items]
Revenues	122,603	213,548
Private Banks | United States
Disaggregation of Revenue [Line Items]
Revenues	80,170	80,886
Private Banks | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	27,846	116,663
Private Banks | Canada
Disaggregation of Revenue [Line Items]
Revenues	10,090	11,800
Private Banks | Ireland
Disaggregation of Revenue [Line Items]
Revenues	4,497	4,199
Private Banks | Luxembourg
Disaggregation of Revenue [Line Items]
Revenues	0	0
Private Banks | Other
Disaggregation of Revenue [Line Items]
Revenues		0
Private Banks | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	32,221	33,118
Private Banks | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	486	255
Private Banks | Investment operations fees
Disaggregation of Revenue [Line Items]
Revenues	346	360
Private Banks | Investment processing fees - PaaS
Disaggregation of Revenue [Line Items]
Revenues	57,585	56,455
Private Banks | Investment processing fees - SaaS
Disaggregation of Revenue [Line Items]
Revenues	26,817	29,559
Private Banks | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	4,086	92,729
Private Banks | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	1,062	1,072
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	106,538	119,230
Investment Advisors | United States
Disaggregation of Revenue [Line Items]
Revenues	106,538	119,230
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
Investment Advisors | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	60,605	71,993
Investment Advisors | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	40,666	42,008
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	5,267	5,229
Institutional Investors
Disaggregation of Revenue [Line Items]
Revenues	74,290	86,839
Institutional Investors | United States
Disaggregation of Revenue [Line Items]
Revenues	62,218	70,563
Institutional Investors | United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	9,095	12,749
Institutional Investors | Canada
Disaggregation of Revenue [Line Items]
Revenues	1,369	1,242
Institutional Investors | Ireland
Disaggregation of Revenue [Line Items]
Revenues	1,608	2,167
Institutional Investors | Luxembourg
Disaggregation of Revenue [Line Items]
Revenues	0	0
Institutional Investors | Other
Disaggregation of Revenue [Line Items]
Revenues		118
Institutional Investors | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	11,283	13,866
Institutional Investors | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	58,935	68,460
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	2,651	3,110
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	1,421	1,403
Investment Managers
Disaggregation of Revenue [Line Items]
Revenues	160,686	156,901
Investment Managers | United States
Disaggregation of Revenue [Line Items]
Revenues	146,272	144,025
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	9,025	9,822
Investment Managers | Luxembourg
Disaggregation of Revenue [Line Items]
Revenues	5,389	3,054
Investment Managers | Other
Disaggregation of Revenue [Line Items]
Revenues		0
Investment Managers | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	126	84
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	147,194	145,379
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	4,121	3,658
Investment Managers | Professional services fees
Disaggregation of Revenue [Line Items]
Revenues	1,514	389
Investment Managers | Account fees and other
Disaggregation of Revenue [Line Items]
Revenues	7,731	7,391
Investments In New Businesses
Disaggregation of Revenue [Line Items]
Revenues	5,002	4,925
Investments In New Businesses | United States
Disaggregation of Revenue [Line Items]
Revenues	5,002	4,925
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
Investments In New Businesses | Investment management fees from pooled investment products
Disaggregation of Revenue [Line Items]
Revenues	338	367
Investments In New Businesses | Investment management fees from investment management agreements
Disaggregation of Revenue [Line Items]
Revenues	4,217	4,126
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	$ 447	$ 432