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Corporate Investments and Funds Held For Clients (Narrative) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale | $ 24,371,700,000 | $ 21,576,600,000
Client Fund Obligation repayment period | 1 year |
Client funds obligations | $ 34,403,800,000 | 25,831,600,000
Funds held for Clients Held-in Grantor Trust | $ 31,092,300,000 |
Client funds investments with original maturities (or less) | 90 days |
Percentage of the available-for-sale securities were rated AAA Or AA | 72.00% |
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | $ (77,600,000) | (700,000)
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 6,331,300,000 | 63,000,000.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (100,000) | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,900,000 | 1,500,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (77,700,000) | (700,000)
Debt Securities, Available-for-sale, Unrealized Loss Position | 6,333,200,000 | 64,500,000
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 | 1,247,400,000 |
Fixed Rate Credit Card |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale | 759,500,000 |
Asset-Backed Equipment Lease Receivable |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale | 263,500,000 |
Rate Reduction Receivable |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale | 68,700,000 |
Federal Farm Credit Banks |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale | 827,300,000 |
Federal Home Loan Banks |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale | 536,800,000 |
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale | 834,600,000 | 868,200,000
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | 0 | 0
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 16,700,000 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 | 1,500,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | 16,700,000 | 1,500,000
Municipal Bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale | 569,500,000 |
Debt Security, Corporate, Non-US |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale | 237,500,000 |
Canadian provincial bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale | 973,700,000 | 710,200,000
Securities in Unrealized Loss Position Less Than 12 Months, Gross Unrealized Losses | (5,300,000) | 0
Securities in Unrealized Loss Position Less Than 12 Months, Fair Market Value | 253,700,000 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | (5,300,000) | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 253,700,000 | $ 0

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