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Income Taxes - Summary of Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Jun. 30, 2017
--- | --- | ---
Deferred tax assets: |  |
Pensions | $ 66.8 | $ 139.8
Postretirement provisions | 33.7 | 54.4
Net operating loss carryforwards | 26.5 | 23.1
Derivatives and hedging activities | 0.0 | 2.4
Other | 29.4 | 44.8
Gross deferred tax assets | 156.4 | 264.5
Valuation allowances | (23.9) | (18.5)
Total deferred tax assets | 132.5 | 246.0
Deferred tax liabilities: |  |
Depreciation | (235.2) | (347.5)
Intangible assets | (11.9) | (19.4)
Inventories | (30.5) | (50.1)
Derivatives and hedging activities | (8.7) | 0.0
Other | (3.5) | (6.2)
Total deferred tax liabilities | (289.8) | (423.2)
Deferred tax liabilities, net | $ (157.3) | $ (177.2)

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