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ACCOUNTING POLICIES (Details 2) (USD $) In Millions, unless otherwise specified |  |  | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Structures Minimum | Dec. 31, 2012 Structures Maximum | Dec. 31, 2012 Revenue equipment Minimum | Dec. 31, 2012 Revenue equipment Maximum | Dec. 31, 2012 Equipment and Other Minimum | Dec. 31, 2012 Equipment and Other Maximum | Dec. 31, 2012 Capitalized software costs Minimum | Dec. 31, 2012 Capitalized software costs Maximum | Dec. 31, 2012 Purchased software applications Maximum
Property, Plant and Equipment |  |  |  |  |  |  |  |  |  |  |
Depreciation/amortization period |  |  | 15 years | 20 years | 3 years | 12 years | 2 years | 15 years | 2 years | 3 years | 7 years
Impairment Assessment of Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |
Assets held for sale which are reported within other noncurrent assets | $ 1.0 | $ 2.5 |  |  |  |  |  |  |  |  |
Asset Retirement Obligations |  |  |  |  |  |  |  |  |  |  |
Estimated asset retirement obligation | $ 2.5 | $ 2.2 |  |  |  |  |  |  |  |  |

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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 143 -Paragraph 3, 10, 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Asset Retirement Obligation -URI http://asc.fasb.org/extlink&oid=6505190 + Details
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- Definition Other assets that are held for sale apart from normal operations, not otherwise included elsewhere in the taxonomy and which are anticipated to be sold in less than one year, but by their nature which are not considered current (originally classified based on not being realized or converted to working capital within one year of the date of the statement of financial position or operating cycle, if longer). + References Reference 1: 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 Reference 2: 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. + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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