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LEGAL PROCEEDINGS, ENVIRONMENTAL MATTERS, AND OTHER EVENTS (Environmental Matters) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) tank state	Dec. 31, 2018 USD ($)
Underground fuel storage tanks
Environmental Matters
Number of underground tanks where the company's subsidiaries store fuel for use in tractors and trucks | tank	56
Number of states in which underground tanks are located | state	16
Environmental cleanup costs
Environmental Matters
Reserve for environmental contingencies | $	$ 0.4	$ 0.6

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- Definition

Represents the number of states in which reporting entity's subsidiaries' underground fuel storage tanks are located.

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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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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.

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