Income Taxes Reconciliation of deferred taxes (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Valuation Allowance [Line Items]
Property, plant and equipment	$ 148.5	$ 160.9
Deferred Tax Liabilities	76.3	85.0
Inventory	(6.9)	(12.4)
Accrued liabilities	(78.9)	(81.5)
Deferred Tax Assets, Operating Loss Carryforwards	(187.0)	(171.7)
Benefit of federal & state tax credit carryovers	(13.2)	(24.4)
Deferred Tax Assets, Other	(1.4)	(4.2)
Valuation Allowance, Amount	50.7	49.1
Deferred Tax Assets, Net, Current	(12.3)	(17.0)
Long-term deferred tax asset	(5.0)	(4.0)
Long-term deferred tax liability	93.6	106.0
Timber Properties [Member]
Valuation Allowance [Line Items]
Deferred Tax Liabilities	10.4	11.4
installment sales gain deferral [Member]
Valuation Allowance [Line Items]
Deferred Tax Liabilities	163.0	166.7
Unrealized Gain (Loss or Write-down) [Member]
Valuation Allowance [Line Items]
Deferred Tax Liabilities	$ (8.9)	$ (8.9)