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Income Taxes - Components of Net Deferred Tax Asset (Liability) (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Tax effect of temporary differences related to: |  |
Inventories | $ 3.3 | $ 4.2
Property and equipment | 0.1 |
Accrued OPEB costs | 3.0 | 3.7
Accrued pension costs | 70.9 | 52.6
Currency revaluation on intercompany debt |  | 24.0
Accrued environmental liabilities | 28.8 | 41.1
Other deductible differences | 11.7 | 25.5
Investments in subsidiaries and affiliates | 2.7 |
Tax loss and tax credit carryforwards | 116.2 | 142.6
Valuation allowance | (2.8) | (173.4)
Adjusted gross deferred tax assets | 233.9 | 120.3
Netting of items by tax jurisdiction, assets | (114.1) | (120.3)
Net noncurrent deferred tax asset (liability) | 119.8 |
Tax effect of temporary differences related to: |  |
Inventories | (0.8) | (4.0)
Marketable securities | (25.4) | (59.9)
Property and equipment | (71.8) | (77.5)
Other taxable differences | (14.0) | (18.9)
Investments in subsidiaries and affiliates | (175.8) | (235.3)
Tax on unremitted earnings of non-U.S. subsidiaries | (9.5) | (2.8)
Adjusted gross deferred tax liabilities | (297.3) | (398.4)
Netting of items by tax jurisdiction, liabilities | (114.1) | (120.3)
Net noncurrent deferred tax asset (liability) | $ (183.2) | $ (278.1)

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