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Income Taxes - Components of Net Deferred Tax Asset (Liability) (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Tax effect of temporary differences related to: |  |
Inventories | $ 1.9 | $ 3.7
Lease assets | 6.3 | 5.9
Accrued OPEB costs | 3.0 | 2.8
Accrued pension costs | 100.5 | 80.6
Accrued environmental liabilities | 31.0 | 33.8
Other deductible differences | 9.2 | 8.3
Investments in subsidiaries and affiliates | 2.7 | 2.6
Tax loss and tax credit carryforwards | 100.4 | 91.2
Valuation allowance | (17.5) | (14.2)
Adjusted gross deferred tax assets | 237.5 | 214.7
Netting of items by tax jurisdiction, assets | (117.3) | (108.7)
Net noncurrent deferred tax asset (liability) | 120.2 | 106.0
Tax effect of temporary differences related to: |  |
Property and equipment | (67.2) | (61.8)
Lease liabilities | (6.5) | (6.1)
Other taxable differences | (13.1) | (13.7)
Investments in subsidiaries and affiliates | (48.1) | (54.4)
Tax on unremitted earnings of non-U.S. subsidiaries | (12.0) | (10.8)
Adjusted gross deferred tax liabilities | (146.9) | (146.8)
Netting of items by tax jurisdiction, liabilities | 117.3 | 108.7
Net noncurrent deferred tax asset (liability) | $ (29.6) | $ (38.1)

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