Corporate Investments and Funds Held For Clients - Narrative (Details) - USD ($)	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale	$ 28,391,600,000	$ 24,371,700,000
Client Fund Obligation repayment period	1 year
Client funds obligations	$ 51,285,500,000	34,403,800,000
Funds held for Clients Held-in Grantor Trust	$ 46,201,200,000
Client funds investments with original maturities (or less)	90 days
Fair Value, Inputs, Level 1
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale	$ 0
Fair Value, Inputs, Level 3
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale	0
Asset-Backed Auto Loan Receivables
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale	973,100,000
Fixed Rate Credit Card
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale	685,900,000
Asset-Backed Equipment Lease Receivable
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale	233,800,000
Rate Reduction Receivable
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale	44,200,000
Federal Farm Credit Banks
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale	980,300,000
Federal Home Loan Banks
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale	524,400,000
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale	829,100,000	$ 834,600,000
Municipal Bonds
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale	536,500,000
Debt Security, Corporate, Non-US
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale	$ 314,100,000