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Corporate Investments and Funds Held for Clients - Schedule of Classification of Corporate Investments on the Consolidated Balance Sheets (Details) - USD ($) $ in Millions | Mar. 31, 2026 | Jun. 30, 2025 | Mar. 31, 2025
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Investments, Debt and Equity Securities [Abstract] |  |  |  |
Cash and cash equivalents |  | $ 3,228.4 | $ 3,347.8 | $ 2,680.6
Short-term marketable securities | [1] | 0.0 | 4,498.8 |
Total corporate investments |  | $ 3,228.4 | $ 7,846.6 |
[1] | As of June 30, 2025, $38.4 million of short-term marketable securities have been pledged as collateral under the Company's reverse repurchase agreements (see Note 10).

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