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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)