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Income Taxes - Details of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Stock compensation $ 4.3 $ 5.5
Net operating loss carry forwards 15.9 18.2
Other intangible assets 4.8 3.7
Accretion expense 3.3 5.1
Other 4.5 9.5
Subtotal 32.8 42.0
Less valuation allowance 0.0 0.0
Total net deferred tax assets 32.8 42.0
Deferred tax liabilities:    
Property, plant and equipment (16.7) (13.0)
Intangible assets including goodwill (27.0) (38.0)
Pension asset (18.3) (8.2)
Investment impairment recapture (3.5) 0.0
Customer relationships (5.8) 0.0
Other 0.0 (0.2)
Total deferred tax liabilities (71.3) (59.4)
Net deferred tax liability (38.5) (17.4)
Deferred tax assets 6.5 14.9
Deferred tax liabilities (45.0) (32.3)
Net deferred tax liability $ (38.5) $ (17.4)