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Corporate Investments and Funds Held For Clients - Reconciliation (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Corporate Investments and Funds Held for Clients      
Amortized cost of cash and cash equivalents $ 366,904 $ 288,767  
Gross unrealized gains on cash and cash equivalents 0 0  
Gross unrealized losses on cash and cash equivalents 0 0  
Fair value of cash and cash equivalents 366,904 288,767 $ 120,053
Amortized cost of funds held for clients' cash and cash equivalents 2,759,349 2,132,545  
Gross unrealized gains on funds held for clients' cash and cash equivalents 0 0  
Gross unrealized losses on funds held for clients' cash and cash equivalents 0 0  
Fair value of funds held for clients' cash and cash equivalents 2,759,349 2,132,545 $ 2,626,114
Available-for-sale securities:      
Amortized cost 511,388 494,741  
Gross unrealized gains 3,476 45  
Gross unrealized losses (2,477) (5,916)  
Fair value 512,387 488,870  
Total investments at amortized cost 3,637,641 2,916,053  
Total investments gross unrealized gains 3,476 45  
Total investments gross unrealized losses (2,477) (5,916)  
Total investments 3,638,640 2,910,182  
Commercial paper      
Available-for-sale securities:      
Amortized cost 49,002 110,003  
Gross unrealized gains 5 12  
Gross unrealized losses (19) (138)  
Fair value 48,988 109,877  
Corporate bonds      
Available-for-sale securities:      
Amortized cost 204,682 112,262  
Gross unrealized gains 2,830 18  
Gross unrealized losses (751) (1,867)  
Fair value 206,761 110,413  
Asset-backed securities      
Available-for-sale securities:      
Amortized cost 40,140 30,061  
Gross unrealized gains 336 10  
Gross unrealized losses (160) (337)  
Fair value 40,316 29,734  
Certificates of deposit      
Available-for-sale securities:      
Amortized cost 37,620 68,247  
Gross unrealized gains 36 5  
Gross unrealized losses (6) (93)  
Fair value 37,650 68,159  
U.S. treasury securities      
Available-for-sale securities:      
Amortized cost 159,125 158,839  
Gross unrealized gains 106 0  
Gross unrealized losses (1,168) (2,839)  
Fair value 158,063 156,000  
U.S government agency securities      
Available-for-sale securities:      
Amortized cost 8,000 8,000  
Gross unrealized gains 0 0  
Gross unrealized losses (323) (513)  
Fair value 7,677 7,487  
Other      
Available-for-sale securities:      
Amortized cost 12,819 7,329  
Gross unrealized gains 163 0  
Gross unrealized losses (50) (129)  
Fair value $ 12,932 $ 7,200