GOODWILL AND INTANGIBLE ASSETS - Other Intangibles (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Intangible Assets, Net
Intangible Assets	$ 161.6	$ 169.7
Accumulated Amortization	(67.8)	(60.6)
Intangible Assets, net	93.8	109.1
Foreign currency translation adjustment	0.1
Foreign currency translation adjustment, Intangible asset, net	0.1
Amortization of intangible assets	7.2	14.3	$ 16.7
Goodwill impairment charge		118.8	11.1
Goodwill impairment charges non-tax deductible		111.0
Trade names
Intangible Assets, Net
Intangible Assets	50.9	59.1
Intangible Assets, net	50.9	59.1
Impairment charges			$ 2.8
Non-competition agreements
Finite-Lived Intangible Assets, Net [Abstract]
Finite lived, Intangible Assets, net	2.0
Intangible Assets, Net
Intangible Assets	21.7	21.7
Accumulated Amortization	(19.7)	(18.4)
Intangible Assets, net	$ 2.0	3.3
Weighted average remaining useful lives	1 year 10 months 24 days
Future estimated amortization expense
2021	$ 1.0
2022	0.9
2023	0.1
Finite lived, Intangible Assets, net	2.0
Customer relationships
Finite-Lived Intangible Assets, Net [Abstract]
Finite lived, Intangible Assets, net	40.8
Intangible Assets, Net
Intangible Assets	88.9	88.9
Accumulated Amortization	(48.1)	(42.2)
Intangible Assets, net	$ 40.8	46.7
Weighted average remaining useful lives	9 years 2 months 12 days
Future estimated amortization expense
2021	$ 5.9
2022	5.9
2023	5.9
2024	4.1
2025	3.1
Thereafter	15.9
Finite lived, Intangible Assets, net	40.8
Non competition agreements and customer relationships and trade names
Intangible Assets, Net
Impairment charges	$ 8.2	85.6
Flatbed
Intangible Assets, Net
Goodwill impairment charge		42.2
Specialized
Intangible Assets, Net
Goodwill impairment charge		$ 76.6