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Income Taxes - Reconciliation of Beginning and Ending balance of Unrecognized Tax (Details) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2023
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized tax benefits at beginning of the year | $ 126.9 | $ 116.9 | $ 98.1
Additions for tax positions | 29.5 | 17.2 | 11.3
Additions for tax positions of prior periods | 26.7 | 17.8 | 16.8
Reductions for tax positions of prior periods | (1.8) | (12.8) | (5.0)
Settlement with tax authorities | (0.1) | (9.0) | (1.8)
Expiration of the statute of limitations | (17.5) | (2.9) | (1.0)
Impact of foreign exchange rate fluctuations | (0.7) | (0.3) | (1.5)
Unrecognized tax benefit at end of year | $ 163.0 | $ 126.9 | $ 116.9

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