v3.26.3
SEGMENT DISCLOSURES - Summary of Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Segment Reporting [Line Items]        
Revenue from external customers $ 702,240 $ 693,818 $ 2,233,025 $ 2,215,328
Corporate & other:        
General & administrative expenses 38,518 31,265 118,395 86,972
Interest expense 23,986 27,960 72,237 80,983
Other income (expense), net (1,449) (8,378) (11,382) (31,786)
Income before income tax expense 52,999 40,406 291,214 271,095
Operating Segments        
Segment Reporting [Line Items]        
Revenue from external customers 702,240 693,818 2,233,025 2,215,328
Personnel costs 436,137 456,888 1,353,589 1,398,713
Facility costs 25,405 26,158 81,848 79,912
Other costs, gains, and losses, net 111,880 95,015 340,648 283,966
Total segment expense 573,422 578,061 1,776,085 1,762,591
Corporate & other:        
Income before income tax expense 128,818 115,757 456,940 452,737
Operating Segments | Financial Services        
Segment Reporting [Line Items]        
Revenue from external customers 597,791 590,431 1,918,445 1,897,036
Personnel costs 369,852 391,666 1,157,282 1,201,748
Facility costs 22,403 22,939 72,415 70,290
Other costs, gains, and losses, net 95,213 79,416 289,341 237,521
Total segment expense 487,468 494,021 1,519,038 1,509,559
Corporate & other:        
Income before income tax expense 110,323 96,410 399,407 387,477
Operating Segments | Benefits and Insurance Services        
Segment Reporting [Line Items]        
Revenue from external customers 104,449 103,387 314,580 318,292
Personnel costs 66,285 65,222 196,307 196,965
Facility costs 3,002 3,219 9,433 9,622
Other costs, gains, and losses, net 16,667 15,599 51,307 46,445
Total segment expense 85,954 84,040 257,047 253,032
Corporate & other:        
Income before income tax expense 18,495 19,347 57,533 65,260
Corporate And Eliminations        
Corporate & other:        
Unallocated corporate operating expenses 14,176 25,081 44,395 45,518
General & administrative expenses 38,518 31,265 118,395 86,972
Interest expense 23,975 27,960 72,199 80,983
Gain from acquisition related adjustment     (57,955)  
Other income (expense), net $ (850) $ (8,955) $ (11,308) $ (31,831)