Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
PROPERTY AND EQUIPMENT
Property and equipment, Gross		$ 722.7	$ 795.0
Accumulated depreciation		(320.0)	(330.7)
Property and equipment, Net		402.7	464.3
Depreciation		91.1	132.2	$ 114.4
Revenue equipment
PROPERTY AND EQUIPMENT
Property and equipment, Gross		546.7	630.6
Assets leased and available for lease to owner operators
PROPERTY AND EQUIPMENT
Property and equipment, Gross		87.1	64.3
Depreciation		18.7	20.5
Buildings and improvements
PROPERTY AND EQUIPMENT
Property and equipment, Gross		57.0	59.9
Furniture and fixtures office and computer equipment vehicles and capitalized software development
PROPERTY AND EQUIPMENT
Property and equipment, Gross		$ 31.9	40.2
Impairment
PROPERTY AND EQUIPMENT
Impairment expense			$ 97.6
Impairment \| Specialized
PROPERTY AND EQUIPMENT
Impairment expense	$ 4.0