ACCOUNTING POLICIES (Property) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Held-for-sale | Other long-term assets
Property, Plant and Equipment
Assets held for sale which are reported within other noncurrent assets	$ 1.2	$ 2.1
Structures | Minimum
Property, Plant and Equipment
Depreciation/amortization period	15 years
Structures | Maximum
Property, Plant and Equipment
Depreciation/amortization period	45 years
Revenue equipment | Minimum
Property, Plant and Equipment
Depreciation/amortization period	3 years
Revenue equipment | Maximum
Property, Plant and Equipment
Depreciation/amortization period	12 years
Other equipment | Minimum
Property, Plant and Equipment
Depreciation/amortization period	2 years
Other equipment | Maximum
Property, Plant and Equipment
Depreciation/amortization period	20 years
Software | Minimum
Property, Plant and Equipment
Depreciation/amortization period	2 years
Software | Maximum
Property, Plant and Equipment
Depreciation/amortization period	7 years