Income Taxes Reconciliation of deferred taxes (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Valuation Allowance [Line Items]
Deferred Tax Liabilities, Property, Plant and Equipment	$ 160.9	$ 175.9
Deferred Tax Liabilities	85.0	135.5
Deferred Tax Assets, Inventory	(12.4)	(14.0)
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	(81.5)	(67.4)
Deferred Tax Assets, Operating Loss Carryforwards	(171.7)	(118.1)
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	(24.4)	(30.2)
Deferred Tax Assets, Other	(4.2)	18.4
Valuation Allowance, Amount	49.1	20.2
Deferred Tax Assets, Net, Current	(17.0)	(23.4)
Deferred Tax Assets, Net, Noncurrent	(4.0)	(5.9)
Deferred Tax Liabilities, Noncurrent	106.0	164.8
Timber Properties [Member]
Valuation Allowance [Line Items]
Deferred Tax Liabilities	11.4	12.8
installment sales gain deferral [Member]
Valuation Allowance [Line Items]
Deferred Tax Liabilities	166.7	166.7
deferred financial income [Member]
Valuation Allowance [Line Items]
Deferred Tax Liabilities	0	(6.9)
Unrealized Gain (Loss or Write-down) [Member]
Valuation Allowance [Line Items]
Deferred Tax Liabilities	$ (8.9)	$ (21.9)