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LONG-TERM DEBT AND FINANCING ARRANGEMENTS (Financing arrangements - Notes payable & Capital leases) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2017
Revenue equipment and software | Notes payable |  |
Financing Arrangements |  |
Equipment financed during the period under notes payable | $ 37.9 | $ 38.6

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