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Income Taxes Reconciliation of deferred taxes (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Valuation Allowance [Line Items]    
Accrued liabilities $ 53.4 $ 83.9
Benefit of capital loss and NOL carryovers 38.9 83.4
Deferred Tax Assets, Other 10.2 11.6
Inventory 6.6 6.9
Market value write down of ARS 4.9 8.8
Benefit of tax credit carryovers 3.5 3.7
Valuation Allowance, Amount (13.6) (37.9)
Deferred Tax Assets, Net 103.9 160.4
Property, plant and equipment (118.2) (164.2)
Timber and timberlands 11.4 11.6
Installment sale gain deferral 5.2 8.0
Total Deferred Tax Liabilities (134.8) (183.8)
Deferred Tax Liabilities, Net (30.9) (23.4)
Long-term deferred tax asset (2.5) (4.3)
Long-term deferred tax liability $ (33.4) $ (27.7)