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LEGAL PROCEEDINGS, ENVIRONMENTAL MATTERS, AND OTHER EVENTS (Details) $ in Millions	6 Months Ended
	Jun. 30, 2015 USD ($) tank state	Dec. 31, 2014 USD ($)
Underground fuel storage tanks
Environmental Matters
Number of underground tanks where the company's subsidiaries store fuel for use in tractors and trucks | tank	63
Number of states in which underground tanks are located | state	19
Clean Water Act | Kent, Washington branch | Freight Transportation (ABF Freight)
Environmental Matters
Reserve for environmental contingencies	$ 0.0
Clean Water Act | Brooklyn, New York branch | Freight Transportation (ABF Freight)
Environmental Matters
Reserve for environmental contingencies	0.0
Environmental cleanup costs
Environmental Matters
Reserve for environmental contingencies	$ 0.8	$ 0.8

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Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable in twelve months or in the next operating cycle if longer.

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