Business Segments (Details) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2019 USD ($) segment	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| segment	2
Identifiable assets	$ 1,907.3		$ 1,907.3		$ 1,617.1
External revenue	1,272.6	$ 1,326.5	2,454.9	$ 2,541.0
Operating income (loss)	14.3	50.9	(17.4)	46.6
Operating Segments \| YRC Freight
Segment Reporting Information [Line Items]
Identifiable assets	1,349.6		1,349.6		973.6
External revenue	800.8	827.6	1,544.6	1,578.9
Operating income (loss)	16.0	26.8	(5.1)	19.9
Operating Segments \| Regional Transportation
Segment Reporting Information [Line Items]
Identifiable assets	784.6		784.6		626.4
External revenue	471.8	499.0	910.4	962.3
Operating income (loss)	2.6	29.2	(4.4)	34.4
Corporate/ Eliminations
Segment Reporting Information [Line Items]
Identifiable assets	(226.9)		(226.9)		$ 17.1
External revenue	0.0	(0.1)	(0.1)	(0.2)
Operating income (loss)	$ (4.3)	$ (5.1)	$ (7.9)	$ (7.7)

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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