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Income Taxes - Details of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Stock compensation | $ 6.7 | $ 4.9
Net operating loss carry forwards | 7.3 | 8.8
Other intangible assets | 6.0 | 5.6
Accretion expense | 3.3 | 3.3
Restructuring provision | 0.0 | 1.9
Foreign tax credits | 3.6 | 0.0
Other | 5.9 | 4.8
Subtotal | 32.8 | 29.3
Less valuation allowance | (0.8) | (0.0)
Total net deferred tax assets | 32.0 | 29.3
Deferred tax liabilities: |  |
Property, plant and equipment | (19.5) | (17.1)
Intangible assets including goodwill | (28.1) | (28.1)
Pension asset | (18.2) | (15.0)
Investment impairment recapture | (1.0) | (2.0)
Customer relationships | (4.2) | (4.9)
Unremitted overseas earnings | (1.0) | (1.1)
Other | (0.5) | (0.5)
Total deferred tax liabilities | (72.5) | (68.7)
Net deferred tax liability | (40.5) | (39.4)
Deferred tax assets | 9.1 | 8.8
Deferred tax liabilities | (49.6) | (48.2)
Net deferred tax liability | $ (40.5) | $ (39.4)

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