LEASES - Future payments under lease agreements prior to ASC 842 adoption (Details) $ in Millions	Dec. 31, 2019 USD ($)
Capital Leases
2019	$ 5.7
2020	4.5
2021	4.3
2022	2.4
2023	2.9
Thereafter	0.8
Total minimum lease payments	20.6
Loan amount attributable to interest	(2.4)
Total (Present value of minimum lease payments on capital leases)	18.2
Less: current portion	(4.8)
Long-term capital leases	13.4
Revenue Equipment
Operating Leases
2020	19.5
2021	13.0
2022	5.7
2023	3.2
2024	0.3
Total minimum lease payments	41.7
Office and Terminals
Operating Leases
2020	11.9
2021	11.2
2022	9.5
2023	8.5
2024	6.6
Thereafter	23.0
Total minimum lease payments	$ 70.7