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Goodwill and Other Intangible Assets - Schedule of Intangible Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 5,121,837 $ 5,121,837
Accumulated Amortization (3,323,141) (3,237,233)
Net Carrying Value $ 1,798,696 1,884,604
Client relationships    
Finite-Lived Intangible Assets [Line Items]    
Weighted-average amortization period 15 years  
Gross Carrying Amount $ 4,199,517 4,199,517
Accumulated Amortization (2,721,405) (2,651,110)
Net Carrying Value $ 1,478,112 1,548,407
Provider network    
Finite-Lived Intangible Assets [Line Items]    
Weighted-average amortization period 15 years  
Gross Carrying Amount $ 896,800 896,800
Accumulated Amortization (586,906) (571,959)
Net Carrying Value $ 309,894 324,841
Technology    
Finite-Lived Intangible Assets [Line Items]    
Weighted-average amortization period 6 years  
Gross Carrying Amount $ 21,850 21,850
Accumulated Amortization (12,766) (12,213)
Net Carrying Value $ 9,084 9,637
Trade names    
Finite-Lived Intangible Assets [Line Items]    
Weighted-average amortization period 9 years  
Gross Carrying Amount $ 2,670 2,670
Accumulated Amortization (1,484) (1,421)
Net Carrying Value $ 1,186 1,249
Non-compete    
Finite-Lived Intangible Assets [Line Items]    
Weighted-average amortization period 5 years  
Gross Carrying Amount $ 1,000 1,000
Accumulated Amortization (580) (530)
Net Carrying Value $ 420 $ 470