Business Segments (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) segment	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			2
Identifiable assets	$ 1,644.5		$ 1,644.5		$ 1,585.5
External revenue	1,326.5	$ 1,260.6	2,541.0	$ 2,431.2
Operating income (loss)	50.9	53.2	46.6	53.5
Operating Segments | YRC Freight
Segment Reporting Information [Line Items]
Identifiable assets	1,001.5		1,001.5		1,042.1
External revenue	827.6	789.5	1,578.9	1,518.4
Operating income (loss)	26.8	30.9	19.9	23.4
Operating Segments | Regional Transportation
Segment Reporting Information [Line Items]
Identifiable assets	620.8		620.8		607.4
External revenue	499.0	471.2	962.3	913.0
Operating income (loss)	29.2	25.3	34.4	37.5
Corporate/ Eliminations
Segment Reporting Information [Line Items]
Identifiable assets	22.2		22.2		$ (64.0)
External revenue	(0.1)	(0.1)	(0.2)	(0.2)
Operating income (loss)	$ (5.1)	$ (3.0)	$ (7.7)	$ (7.4)