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Income Taxes - Components of Net Deferred Tax Liability (Detail) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Tax effect of temporary differences related to: |  |
Inventories | $ 0.5 | $ 0.4
Accrued OPEB costs | 0.2 | 0.3
Accrued pension costs | 0.5 | 0.5
Accrued employee benefits | 1.3 | 1.1
Accrued environmental liabilities | 26.7 | 29.1
Other accrued liabilities and deductible differences | 0.2 |
Adjusted gross deferred tax assets (liabilities) | 29.4 | 31.4
Netting of items by tax jurisdiction | (29.4) | (31.4)
Marketable securities | (7.0) | (3.6)
Property and equipment | (2.7) | (2.6)
Goodwill | (1.7) | (1.7)
Other taxable differences | (2.3) | (2.3)
Investment in Kronos Worldwide, Inc. | (59.8) | (55.0)
Adjusted gross deferred tax assets (liabilities) | (73.5) | (65.2)
Netting of items by tax jurisdiction | 29.4 | 31.4
Net noncurrent deferred tax liability | $ (44.1) | $ (33.8)

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