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LONG-TERM DEBT AND FINANCING ARRANGEMENTS (Financing arrangements - Notes payable & Capital leases) (Details) - USD ($) $ in Millions | 12 Months Ended
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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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