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Corporate Investments and Funds Held for Clients - Expected Maturities of Available-For-Sale Securities (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Jun. 30, 2024
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Investments, Debt and Equity Securities [Abstract] |  |
One year or less | $ 8,454.4 |
One year to two years | 6,522.9 |
Two years to three years | 4,144.1 |
Three years to four years | 5,217.7 |
After four years | 9,517.5 |
Total available-for-sale securities | $ 33,856.6 | $ 31,207.5

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