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Goodwill And Intangible Assets (Components Of Intangible Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Schedule of Indefinite-Lived And Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross carrying amount $ 2,860,728 $ 2,836,774
Intangible assets, accumulated amortization (1,272,044) (1,089,310)
Customer Relationships [Member]    
Schedule of Indefinite-Lived And Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross carrying amount 1,450,503 1,425,330
Intangible assets, accumulated amortization (600,724) (498,987)
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 (149,560) (120,394)
Broker and Agent Relationships [Member]    
Schedule of Indefinite-Lived And Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross carrying amount 297,693 296,972
Intangible assets, accumulated amortization (168,586) (152,142)
Trade Names [Member]    
Schedule of Indefinite-Lived And Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross carrying amount 293,270 293,194
Intangible assets, accumulated amortization (138,040) (118,976)
Technology [Member]    
Schedule of Indefinite-Lived And Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross carrying amount 113,248 113,170
Intangible assets, accumulated amortization (100,781) (92,646)
Insurance Licenses [Member]    
Schedule of Indefinite-Lived And Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross carrying amount 72,333 74,333
Intangible assets, accumulated amortization 0 0
Other [Member]    
Schedule of Indefinite-Lived And Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross carrying amount 169,681 169,775
Intangible assets, accumulated amortization $ (114,353) $ (106,165)