GOODWILL AND INTANGIBLE ASSETS (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Goodwill
Balance at the beginning of the period				$ 258.4	$ 302.7
Impairment	$ (6.0)	$ (112.8)	$ (11.1)	(118.8)	(11.1)
Goodwill acquired and adjustments to previously recorded goodwill (net)					(32.1)
Adjustments to previously recorded goodwill (net)				(0.3)
Foreign currency translation adjustment				0.6	(1.1)
Balance at the end of the period	139.9		258.4	139.9	258.4
Flatbed
Goodwill
Balance at the beginning of the period				101.5	105.9
Impairment				(42.2)
Goodwill acquired and adjustments to previously recorded goodwill (net)					(4.4)
Balance at the end of the period	59.3		101.5	59.3	101.5
Specialized
Goodwill
Balance at the beginning of the period				156.9	196.8
Impairment				(76.6)	(11.1)
Goodwill acquired and adjustments to previously recorded goodwill (net)					(27.7)
Adjustments to previously recorded goodwill (net)				(0.3)
Foreign currency translation adjustment				0.6	(1.1)
Balance at the end of the period	$ 80.6		$ 156.9	$ 80.6	$ 156.9