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v3.6.0.2

Income Taxes - Details of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred tax assets: |  |
Stock options | $ 5.5 | $ 5.2
Net operating loss carry forwards | 18.2 | 2.7
Intangible assets | 3.7 | 3.3
Accretion expense | 5.1 | 4.8
Other | 9.5 | 6.0
Subtotal | 42.0 | 22.0
Less valuation allowance | 0.0 | 0.0
Total net deferred tax assets | 42.0 | 22.0
Deferred tax liabilities: |  |
Excess of book over tax basis in property, plant and equipment | (13.0) | (4.1)
Goodwill amortization | (11.3) | (11.3)
Intangible amortization | (26.7) | (23.4)
Pension liabilities | (8.2) | (10.0)
Other | (0.2) | (0.7)
Total deferred tax liabilities | (59.4) | (49.5)
Net deferred tax liability | (17.4) | (27.5)
Current portion of deferred tax assets | 0.0 | 8.8
Deferred tax assets, net of current portion | 14.9 | 1.4
Current portion of deferred tax liabilities | 0.0 | 0.0
Deferred tax liabilities, net of current portion | (32.3) | (37.7)
Net deferred tax (liability)/asset | $ (17.4) | $ (27.5)

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