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Corporate Investments and Funds Held for Clients - Schedule of Expected Maturities of Available-For-Sale Securities (Details) - USD ($) $ in Millions | Mar. 31, 2026 | Jun. 30, 2025
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Investments, Debt and Equity Securities [Abstract] |  |
One year or less | $ 6,561.4 |
One year to two years | 5,225.6 |
Two years to three years | 6,910.7 |
Three years to four years | 5,689.8 |
After four years | 12,656.1 |
Total available-for-sale securities | $ 37,043.6 | $ 33,777.7

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