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Income Taxes - Details of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets: |  |
Stock compensation | $ 4.9 | $ 4.3
Net operating loss carry forwards | 8.8 | 15.9
Other intangible assets | 5.6 | 4.8
Accretion expense | 3.3 | 3.3
Restructuring provision | 1.9 | 0.0
Other | 4.8 | 4.5
Subtotal | 29.3 | 32.8
Less valuation allowance | 0.0 | 0.0
Total net deferred tax assets | 29.3 | 32.8
Deferred tax liabilities: |  |
Property, plant and equipment | (17.1) | (16.7)
Intangible assets including goodwill | (28.1) | (27.0)
Pension asset | (15.0) | (18.3)
Investment impairment recapture | (2.0) | (3.5)
Customer relationships | (4.9) | (5.8)
Unremitted overseas earnings | (1.1) | 0.0
Other | (0.5) | 0.0
Total deferred tax liabilities | (68.7) | (71.3)
Net deferred tax liability | (39.4) | (38.5)
Deferred tax assets | 8.8 | 6.5
Deferred tax liabilities | (48.2) | (45.0)
Net deferred tax liability | $ (39.4) | $ (38.5)

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