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Income Taxes - Components of Net Deferred Tax Asset (Liability) (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Tax effect of temporary differences related to: |  |
Inventories | $ 4.7 | $ 3.3
Property and equipment |  | 0.1
Accrued OPEB costs | 2.8 | 3.0
Accrued pension costs | 75.5 | 70.9
Accrued environmental liabilities | 35.8 | 28.8
Other deductible differences | 10.3 | 11.7
Investments in subsidiaries and affiliates | 2.6 | 2.7
Tax loss and tax credit carryforwards | 93.9 | 116.2
Valuation allowance | (10.0) | (2.8)
Adjusted gross deferred tax assets | 215.6 | 233.9
Netting of items by tax jurisdiction, assets | (114.6) | (114.1)
Net noncurrent deferred tax asset (liability) | 101.0 | 119.8
Tax effect of temporary differences related to: |  |
Inventories | (3.3) | (0.8)
Marketable securities | (0.2) | (25.4)
Property and equipment | (69.0) | (71.8)
Other taxable differences | (13.2) | (14.0)
Investments in subsidiaries and affiliates | (58.8) | (175.8)
Tax on unremitted earnings of non-U.S. subsidiaries | (11.3) | (9.5)
Adjusted gross deferred tax liabilities | (155.8) | (297.3)
Netting of items by tax jurisdiction, liabilities | (114.6) | (114.1)
Net noncurrent deferred tax asset (liability) | $ (41.2) | $ (183.2)

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