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LONG-TERM DEBT AND FINANCING ARRANGEMENTS (Financing arrangements - Notes payable & Capital leases) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Asset-Based | Revenue equipment | Notes payable
Financing Arrangements
Equipment financed during the period under notes payable	$ 84.2	$ 83.4	$ 80.6

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