Corporate Investments and Funds Held For Clients - Reconciliation (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Corporate Investments and Funds Held for Clients
Amortized cost of cash and cash equivalents	$ 218,696	$ 250,851
Fair value of cash and cash equivalents	218,696	250,851	$ 75,900
Amortized cost of funds held for clients' cash and cash equivalents	2,154,552	1,241,282
Fair value of funds held for clients' cash and cash equivalents	2,154,552	1,241,282	$ 1,660,771
Available-for-sale securities
Amortized cost	63,015	122,266
Gross unrealized gains	356	911
Fair value	63,371	123,177
Total investments at amortized cost	2,436,263	1,614,399
Total investments gross unrealized gain	356	911
Total investments at fair value	2,436,619	1,615,310
Commercial paper
Available-for-sale securities
Amortized cost		6,643
Gross unrealized gains		6
Fair value		6,649
Corporate bonds
Available-for-sale securities
Amortized cost	33,157	44,343
Gross unrealized gains	188	414
Fair value	33,345	44,757
Asset-backed securities
Available-for-sale securities
Amortized cost	29,858	49,978
Gross unrealized gains	168	424
Fair value	30,026	50,402
U.S. treasury securities
Available-for-sale securities
Amortized cost		21,302
Gross unrealized gains		67
Fair value		21,369
Corporate investments
Available-for-sale securities
Fair value	13,637	37,155
Funds held for clients
Available-for-sale securities
Fair value	$ 49,734	$ 86,022

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The amount of funds held for clients that are cash and cash equivalents.

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Amortized cost of funds held for clients' cash and cash equivalents.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments.

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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