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Goodwill and Other Intangible Assets - Schedule of Intangible Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Intangible Asset, Finite-Lived [Line Items]    
Gross Carrying Amount $ 5,121,837 $ 5,121,837
Accumulated Amortization (3,409,049) (3,237,233)
Net Carrying Value $ 1,712,788 1,884,604
Client relationships    
Intangible Asset, Finite-Lived [Line Items]    
Weighted-average amortization period 15 years  
Gross Carrying Amount $ 4,199,517 4,199,517
Accumulated Amortization (2,791,701) (2,651,110)
Net Carrying Value $ 1,407,816 1,548,407
Provider network    
Intangible Asset, Finite-Lived [Line Items]    
Weighted-average amortization period 15 years  
Gross Carrying Amount $ 896,800 896,800
Accumulated Amortization (601,852) (571,959)
Net Carrying Value $ 294,948 324,841
Technology    
Intangible Asset, Finite-Lived [Line Items]    
Weighted-average amortization period 6 years  
Gross Carrying Amount $ 21,850 21,850
Accumulated Amortization (13,320) (12,213)
Net Carrying Value $ 8,530 9,637
Trade names    
Intangible Asset, Finite-Lived [Line Items]    
Weighted-average amortization period 9 years  
Gross Carrying Amount $ 2,670 2,670
Accumulated Amortization (1,546) (1,421)
Net Carrying Value $ 1,124 1,249
Non-compete    
Intangible Asset, Finite-Lived [Line Items]    
Weighted-average amortization period 5 years  
Gross Carrying Amount $ 1,000 1,000
Accumulated Amortization (630) (530)
Net Carrying Value $ 370 $ 470