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ACCOUNTING POLICIES (Property) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Held-for-sale | Other long-term assets
Property, Plant and Equipment
Assets held for sale which are reported within other noncurrent assets	$ 0.7	$ 1.4
Structures | Minimum
Property, Plant and Equipment
Depreciation/amortization period	15 years
Structures | Maximum
Property, Plant and Equipment
Depreciation/amortization period	60 years
Revenue equipment | Minimum
Property, Plant and Equipment
Depreciation/amortization period	3 years
Revenue equipment | Maximum
Property, Plant and Equipment
Depreciation/amortization period	14 years
Service, office, and other equipment | Minimum
Property, Plant and Equipment
Depreciation/amortization period	2 years
Service, office, and other equipment | Maximum
Property, Plant and Equipment
Depreciation/amortization period	15 years
Software | Minimum
Property, Plant and Equipment
Depreciation/amortization period	2 years
Software | Maximum
Property, Plant and Equipment
Depreciation/amortization period	7 years

X

- Definition

Amount classified as assets attributable to disposal group held for sale or disposed of, expected to be disposed of after one year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
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+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- 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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