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Summary of Significant Accounting Policies Assets Held for Sale (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Assets Held-for-sale, Property, Plant and Equipment | $ 167.9 | $ 214.3
Accumulated depreciation | 135.4 | 162.4
Net property, plant and equipment | 32.5 | 51.9
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 | 10.0 | 13.1
Building [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Assets Held-for-sale, Property, Plant and Equipment | 17.1 | 22.9
Machinery and equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Assets Held-for-sale, Property, Plant and Equipment | $ 140.8 | $ 178.3

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- Definition Property, plant and equipment that is held for sale apart from normal operations and anticipated to be sold in less than one year. + References 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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 46 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 + Details
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