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Corporate Investments and Funds Held for Clients - Narrative (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Jun. 30, 2024
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale | $ 33,019,900,000 | $ 31,207,500,000
Client fund obligation repayment period | 1 year |
Client funds obligations | $ 48,482,200,000 | 39,503,900,000
Client funds held in grantor trust | $ 43,112,400,000 | 34,940,000,000
Client funds investments with original maturities | 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 | 751,900,000 |
Fixed Rate Credit Card |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale | 480,100,000 |
Asset-Backed Equipment Lease Receivable |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale | 167,500,000 |
Federal Farm Credit Banks |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale | 960,200,000 |
Federal Home Loan Banks |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale | 480,000,000.0 |
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale | 453,000,000.0 | $ 500,800,000
Municipal Bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale | 523,700,000 |
Debt Security, Corporate, Non-US |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale | 293,900,000 |
Supranational Bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale | $ 213,000,000.0 |

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