Corporate Investments and Funds Held For Clients (Narrative) (Details) - USD ($)	3 Months Ended
	Sep. 30, 2022	Jun. 30, 2022
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale	$ 28,761,000,000	$ 28,391,600,000
Client fund obligation repayment period	1 year
Client funds obligations	$ 35,471,700,000	51,285,500,000
Client funds held in grantor trust	$ 30,130,700,000	46,201,200,000
Client funds investments with original maturities	ninety days or less
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	866,600,000
Fixed Rate Credit Card
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale	511,600,000
Asset-Backed Equipment Lease Receivable
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale	217,100,000
Rate Reduction
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale	39,300,000
Federal Farm Credit Banks
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale	947,200,000
Federal Home Loan Banks
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale	493,700,000
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale	753,800,000	$ 829,100,000
Municipal Bonds
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale	518,800,000
Debt Security, Corporate, Non-US
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale	252,600,000
Supranational Bonds
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale	$ 230,200,000