Summary of Significant Accounting Policies Assets Held for Sale (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Assets Held-for-sale, Property, Plant and Equipment	$ 214.3	$ 235.6
Assets Held For Sale Accumulated Depreciation	162.4	177.7
Assets Held For Sale Property Plant and Equipment Net	51.9	57.9
Land Land Improvements And Logging Roads Net of Road Amortization [Member]
Property, Plant and Equipment [Line Items]
Assets Held-for-sale, Property, Plant and Equipment	13.1	13.4
Building [Member]
Property, Plant and Equipment [Line Items]
Assets Held-for-sale, Property, Plant and Equipment	22.9	24.5
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Assets Held-for-sale, Property, Plant and Equipment	$ 178.3	$ 197.7

Property, plant and equipment that is held for sale apart from normal operations and anticipated to be sold in less than one year.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 144

-Paragraph 46

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 45

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759

Name:	us-gaap_AssetsHeldForSalePropertyPlantAndEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant