Business Segments (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) segment	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			2
Identifiable assets	$ 1,657.6		$ 1,657.6		$ 1,585.5
External revenue	1,303.6	$ 1,251.2	3,844.6	$ 3,682.4
Operating income (loss)	41.2	43.4	87.8	96.9
Operating Segments | YRC Freight
Segment Reporting Information [Line Items]
Identifiable assets	1,000.9		1,000.9		1,042.1
External revenue	822.1	787.8	2,401.0	2,306.2
Operating income (loss)	24.7	23.2	44.6	46.6
Operating Segments | Regional Transportation
Segment Reporting Information [Line Items]
Identifiable assets	646.2		646.2		607.4
External revenue	481.5	463.5	1,443.8	1,376.5
Operating income (loss)	18.4	21.5	52.8	59.0
Corporate/ Eliminations
Segment Reporting Information [Line Items]
Identifiable assets	10.5		10.5		$ (64.0)
External revenue	0.0	(0.1)	(0.2)	(0.3)
Operating income (loss)	$ (1.9)	$ (1.3)	$ (9.6)	$ (8.7)