CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($) $ in Millions	12 Months Ended
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)

Amount, after reclassification adjustment, of tax (expense) benefit for (increase) decrease in accumulated other comprehensive income of defined benefit plan.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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