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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2022
Statement of Comprehensive Income [Abstract] |  |  |
Net (loss) gain on derivative instruments, tax expense (benefit) | $ (0.3) | $ 3.9 | $ 0.5
Pension and postretirement benefits, tax (expense) benefit | $ (16.0) | $ (11.8) | $ (8.4)

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