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Income Taxes - Summary of Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Jun. 30, 2023
--- | --- | ---
Deferred tax assets: |  |
Pensions | $ 33.1 | $ 39.8
Postretirement provisions | 14.4 | 20.0
Non-equity compensation | 9.6 | 16.0
Net operating loss carryforwards | 8.5 | 22.5
Tax credit carryforwards | 2.0 | 1.2
Operating lease liabilities | 8.9 | 10.0
Other | 20.1 | 22.3
Gross deferred tax assets | 96.6 | 131.8
Valuation allowances | (2.4) | (13.6)
Total deferred tax assets | 94.2 | 118.2
Deferred tax liabilities: |  |
Depreciation | 219.6 | 237.6
Intangible assets | 3.2 | 5.8
Inventories | 28.2 | 27.4
Operating lease right-of-use assets | 7.0 | 8.0
Other | 2.8 | 3.1
Total deferred tax liabilities | 260.8 | 281.9
Deferred tax liabilities, net | $ 166.6 | $ 163.7

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