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Goodwill And Intangible Assets (Components Of Intangible Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Schedule of Indefinite-Lived And Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross carrying amount $ 2,898,994 $ 2,860,728
Intangible assets, accumulated amortization (1,439,374) (1,272,044)
Customer Relationships [Member]    
Schedule of Indefinite-Lived And Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross carrying amount 1,488,796 1,450,503
Intangible assets, accumulated amortization (699,550) (600,724)
Investment Management Agreements [Member]    
Schedule of Indefinite-Lived And Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross carrying amount 464,000 464,000
Intangible assets, accumulated amortization (178,727) (149,560)
Broker and Agent Relationships [Member]    
Schedule of Indefinite-Lived And Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross carrying amount 295,694 297,693
Intangible assets, accumulated amortization (182,139) (168,586)
Trade Names [Member]    
Schedule of Indefinite-Lived And Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross carrying amount 305,381 293,270
Intangible assets, accumulated amortization (157,494) (138,040)
Technology [Member]    
Schedule of Indefinite-Lived And Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross carrying amount 113,187 113,248
Intangible assets, accumulated amortization (107,727) (100,781)
Insurance Licenses [Member]    
Schedule of Indefinite-Lived And Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross carrying amount 72,333 72,333
Intangible assets, accumulated amortization 0 0
Other [Member]    
Schedule of Indefinite-Lived And Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross carrying amount 159,603 169,681
Intangible assets, accumulated amortization $ (113,737) $ (114,353)