GOODWILL AND INTANGIBLE ASSETS - Other Intangibles (Details) $ in Millions				1 Months Ended	3 Months Ended				12 Months Ended
	Mar. 10, 2020 segment	Jul. 30, 2019 segment	Jul. 29, 2019 segment	Jun. 30, 2018 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($) segment	Dec. 31, 2017 USD ($) segment
Intangible Assets, Net
Number of operating segments integrated | segment	3	3
Number of operating segments | segment		13	16						13	16	15
Goodwill impairment charge					$ 6.0	$ 112.8	$ 11.1		$ 118.8	$ 11.1
Goodwill impairment charges non-tax deductible						111.0
Impairment charge						85.6	11.1
Intangible Assets					169.7		255.1		169.7	255.1
Accumulated Amortization					(60.6)		(46.3)		(60.6)	(46.3)
Impairment						$ (85.6)	(11.1)
Intangible Assets, net					109.1		208.8		109.1	208.8
Foreign currency translation adjustment							0.2			0.2
Foreign currency translation adjustment, Intangible asset, net							0.2			0.2
Amortization of intangible assets									14.3	16.7	$ 6.7
Trade names
Intangible Assets, Net
Impairment charge								$ 2.8
Intangible Assets					59.1		90.6		59.1	90.6
Impairment								$ (2.8)
Intangible Assets, net					59.1		90.6		59.1	90.6
Non-compete agreements
Intangible Assets, Net
Intangible Assets					21.7		33.8		21.7	33.8
Accumulated Amortization					(18.4)		(12.8)		(18.4)	(12.8)
Intangible Assets, net					3.3		21.0		$ 3.3	$ 21.0
Weighted average remaining useful lives									2 years 8 months 12 days	3 years
Future estimated amortization expense
2020					1.3				$ 1.3
2021					1.0				1.0
2022					0.9				0.9
2023					0.1				0.1
Total					3.3				3.3
Customer relationships
Intangible Assets, Net
Intangible Assets					88.9		130.9		88.9	$ 130.9
Accumulated Amortization					(42.2)		(33.5)		(42.2)	(33.5)
Intangible Assets, net					46.7		$ 97.4		$ 46.7	$ 97.4
Weighted average remaining useful lives									9 years 8 months 12 days	10 years 4 months 24 days
Future estimated amortization expense
2020					5.9				$ 5.9
2021					5.9				5.9
2022					5.9				5.9
2023					5.9				5.9
2024					4.5				4.5
Thereafter					18.6				18.6
Total					$ 46.7				46.7
Flatbed
Intangible Assets, Net
Goodwill impairment charge									42.2
Specialized
Intangible Assets, Net
Goodwill impairment charge									$ 76.6	$ 11.1
Specialized | Trade names
Intangible Assets, Net
Impairment charge				$ 2.8
Impairment				$ (2.8)