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Income Taxes - Details of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Deferred tax assets:    
Foreign tax credits $ 0.0 $ 0.8
Accrued expenses 0.3 0.3
Stock options 5.2 5.0
Excess of tax over book basis in property, plant and equipment 0.1 0.4
Net operating loss carry forwards 2.7 0.6
Pension assets 0.6 0.7
Intangible assets 3.3 5.3
Accretion expense 4.8 0.9
Other 5.0 4.5
Subtotal 22.0 18.5
Less valuation allowance 0.0 0.0
Total net deferred tax assets 22.0 18.5
Deferred tax liabilities:    
Excess of book over tax basis in property, plant and equipment (4.1) (2.7)
Goodwill amortization (11.3) (13.0)
Intangible amortization (23.4) (7.2)
Pension liabilities (10.0) (9.0)
Other (0.7) (0.5)
Total deferred tax liabilities (49.5) (32.4)
Net deferred tax liability (27.5) (13.9)
Current portion of deferred tax assets 8.8 8.4
Deferred tax assets, net of current portion 1.4 0.7
Current portion of deferred tax liabilities 0.0 0.0
Deferred tax liabilities, net of current portion (37.7) (23.0)
Net deferred tax (liability)/asset $ (27.5) $ (13.9)