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Business Combinations and Divestitures - Deconsolidation, Disposal, And Assets Held For Sale (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Mar. 06, 2024
Jan. 09, 2024
Nov. 06, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Impairment loss on goodwill and intangible assets $ 700,000 $ 695,000 $ 52,918,000      
Assets held for sale 0 0 56,634,000      
Liabilities held for sale 0 0 13,792,000      
Held for Sale            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Assets held for sale 0 0 56,634,000      
Liabilities held for sale 0 0 13,792,000      
Wealth Management | Disposal group, disposed of by sale, not discontinued operations | Family Office Service ("FOS")            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Expected cash consideration           $ 20,100,000
Gain (loss) on disposal $ 9,400,000          
Alvarium RE Limited ("ARE") | Strategic Alternatives | Entity owned by management Of Alvarium Home REIT Advisors Ltd (“AHRA”)            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Impairment loss on goodwill and intangible assets     29,400,000      
LondonMetric Property Plc | Strategic Alternatives | Disposal group, disposed of by sale, not discontinued operations | LXi Reit Advisors Limited (“LRA”) | Fund management            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Impairment loss on goodwill and intangible assets     $ 23,500,000      
Ownership percentage in disposed asset (in percent)         100.00%  
Consideration receivable       $ 33,100,000 $ 33,100,000  
Contingent consideration receivable       $ 5,100,000 $ 5,100,000  
Gain (loss) on disposal   $ 0