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Income Taxes - Components of Net Deferred Tax Liability (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Tax effect of temporary differences related to: |  |
Inventories | $ 4.4 | $ 3.6
Marketable securities |  |
Accrued OPEB costs | 4.6 | 6.9
Accrued pension costs | 21.8 | 33.3
Accrued environmental liabilities | 40.1 | 16.9
Other deductible differences | 58.8 | 26.2
Tax loss and tax credit carryforwards | 191.8 | 153.0
Valuation allowance | (0.1) | (0.2)
Adjusted gross deferred tax assets (liabilities) | 321.4 | 239.7
Netting of items by tax jurisdiction, assets | (149.2) | (109.8)
Total | 172.2 | 129.9
Less net current deferred tax asset (liability) | 23.0 | 9.6
Net noncurrent deferred tax asset (liability) | 149.2 | 120.3
Tax effect of temporary differences related to: |  |
Inventories | (2.6) | (10.3)
Marketable securities | (145.8) | (164.8)
Property and equipment | (115.8) | (104.5)
Other taxable differences | (35.1) | (30.3)
Investments in subsidiaries and affiliates | (280.6) | (258.3)
Tax on unremitted earnings of non-U.S. subsidiaries | (2.6) | (7.6)
Adjusted gross deferred tax assets (liabilities) | (582.5) | (575.8)
Netting of items by tax jurisdiction, liabilities | (149.2) | (109.8)
Total | (433.3) | (466.0)
Less net current deferred tax asset (liability) | (2.2) | (11.2)
Net noncurrent deferred tax asset (liability) | $ (431.1) | $ (454.8)

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