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Goodwill and Intangible Assets - Schedule of intangible assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Finite-lived Intangible Assets [Roll Forward]    
Gross Carrying Value $ 2,593,311 $ 2,637,733
Accumulated Amortization 1,390,808 1,250,219
Net Carrying Value 1,202,503 1,387,514
Indefinite-lived Intangible Assets [Roll Forward]    
Indefinite-Lived Intangible Assets (Excluding Goodwill) 1,480,000 1,480,000
Indefinite-Lived Trade Names 695,000 900,000
Intangible Assets, Gross (Excluding Goodwill) 4,073,311 4,117,733
Other Intangible Assets Accumulated Amortization 1,390,808 1,250,219
Indefinite Lived Trade Names Impairment Charges 785,000 580,000
Intangible Assets Impairement Charges 785,000 580,000
Intangible Assets, Net (Including Goodwill) $ 1,897,503 $ 2,287,514
Client relationships [Member]    
Finite-lived Intangible Assets [Roll Forward]    
Weighted Average Useful Life 14 years 14 years
Gross Carrying Value $ 2,488,802 $ 2,480,167
Accumulated Amortization 1,338,381 1,158,732
Net Carrying Value $ 1,150,421 $ 1,321,435
Trade names [Member]    
Finite-lived Intangible Assets [Roll Forward]    
Weighted Average Useful Life 10 years 8 years
Gross Carrying Value $ 97,009 $ 138,206
Accumulated Amortization 47,986 78,355
Net Carrying Value $ 49,023 $ 59,851
Developed technology [Member]    
Finite-lived Intangible Assets [Roll Forward]    
Weighted Average Useful Life 6 years 5 years
Gross Carrying Value $ 7,500 $ 13,260
Accumulated Amortization 4,441 8,206
Net Carrying Value $ 3,059 $ 5,054
Covenant not to compete [Member]    
Finite-lived Intangible Assets [Roll Forward]    
Weighted Average Useful Life   5 years
Gross Carrying Value   $ 6,100
Accumulated Amortization   4,926
Net Carrying Value   $ 1,174