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Corporate Investments and Funds Held For Clients - Reconciliation (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Corporate Investments and Funds Held for Clients      
Amortized cost of cash and cash equivalents $ 84,104 $ 202,287  
Fair value of cash and cash equivalents 84,104 202,287 $ 218,696
Amortized cost of funds held for clients' cash and cash equivalents 1,770,689 1,743,594  
Fair value of funds held for clients' cash and cash equivalents 1,770,689 1,743,594 $ 2,154,552
Available-for-sale securities:      
Amortized cost 149,840 20,452  
Gross unrealized gains 4 87  
Gross unrealized losses (470) 0  
Fair value 149,374 20,539  
Total investments at amortized cost 2,004,633 1,966,333  
Total investments gross unrealized gains 4 87  
Total investments gross unrealized losses (470) 0  
Total investments at fair value 2,004,167 1,966,420  
Commercial paper      
Available-for-sale securities:      
Amortized cost 62,240    
Gross unrealized gains 3    
Gross unrealized losses (16)    
Fair value 62,227    
Corporate bonds      
Available-for-sale securities:      
Amortized cost 42,873 13,390  
Gross unrealized gains 0 70  
Gross unrealized losses (286) 0  
Fair value 42,587 13,460  
Asset-backed securities      
Available-for-sale securities:      
Amortized cost 10,361 7,062  
Gross unrealized gains 1 17  
Gross unrealized losses (26) 0  
Fair value 10,336 7,079  
Certificates of deposit      
Available-for-sale securities:      
Amortized cost 20,500    
Gross unrealized gains 0    
Gross unrealized losses (7)    
Fair value 20,493    
U.S. treasury securities      
Available-for-sale securities:      
Amortized cost 4,042    
Gross unrealized gains 0    
Gross unrealized losses (19)    
Fair value 4,023    
U.S government agency securities      
Available-for-sale securities:      
Amortized cost 7,000    
Gross unrealized gains 0    
Gross unrealized losses (101)    
Fair value 6,899    
Other      
Available-for-sale securities:      
Amortized cost 2,824    
Gross unrealized gains 0    
Gross unrealized losses (15)    
Fair value $ 2,809    
Corporate investments      
Available-for-sale securities:      
Fair value   4,456  
Funds held for clients      
Available-for-sale securities:      
Fair value   $ 16,083