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Corporate Investments and Funds Held For Clients (Narrative) (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Jun. 30, 2020
Debt Securities, Available-for-sale [Line Items] |  |
Fair market value | $ 22,350,500,000 | $ 21,576,600,000
Client fund obligation repayment period | 1 year |
Client funds obligations | $ 36,066,100,000 | 25,831,600,000
Client funds held in grantor trust | $ 33,706,400,000 | 23,740,000,000.0
Client funds investments with original maturities | ninety days or less |
Percentage of the available-for-sale securities were rated AAA Or AA | 77.00% |
Corporate Investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair market value | $ 10,600,000 | 13,600,000
Funds Held For Clients |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair market value | 22,339,900,000 | 21,563,000,000.0
Fair Value, Inputs, Level 1 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair market value | 0 |
Fair Value, Inputs, Level 3 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair market value | 0 |
Asset-Backed Auto Loan Receivables |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair market value | 1,478,700,000 |
Fixed Rate Credit Card |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair market value | 965,800,000 |
Asset-Backed Equipment Lease Receivable |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair market value | 302,800,000 |
Rate Reduction |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair market value | 80,800,000 |
Federal Farm Credit Banks |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair market value | 679,400,000 |
Federal Home Loan Banks |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair market value | 584,700,000 |
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair market value | 860,400,000 | $ 868,200,000
Municipal Bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair market value | 560,700,000 |
Debt Security, Corporate, Non-US |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair market value | $ 208,300,000 |

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