Business Segments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
External revenue	$ 4,891.0	$ 4,697.5	$ 4,832.4
Operating income (loss)	98.4	124.3	93.0
Identifiable assets	1,585.5	1,770.0	1,879.4
Acquisition of property and equipment	(103.3)	(100.6)	(108.0)
Proceeds from disposal of property and equipment	8.8	35.1	17.5
Depreciation and amortization	147.7	159.8	163.7
YRC Freight
Segment Reporting Information [Line Items]
External revenue	3,067.9	2,958.9	3,055.7
Operating income (loss)	41.4	53.2	18.0
Identifiable assets	1,042.1	1,208.7	1,351.5
Acquisition of property and equipment	(66.6)	(73.2)	(59.2)
Proceeds from disposal of property and equipment	8.1	31.3	12.0
Depreciation and amortization	84.8	90.3	93.1
Regional Transportation
Segment Reporting Information [Line Items]
External revenue	1,823.4	1,739.3	1,776.9
Operating income (loss)	67.9	81.3	85.4
Identifiable assets	607.4	642.9	652.9
Acquisition of property and equipment	(36.6)	(27.4)	(48.7)
Proceeds from disposal of property and equipment	0.7	3.8	5.5
Depreciation and amortization	62.9	69.5	70.7
Corporate/Eliminations
Segment Reporting Information [Line Items]
External revenue	(0.3)	(0.7)	(0.2)
Operating income (loss)	(10.9)	(10.2)	(10.4)
Identifiable assets	(64.0)	(81.6)	(125.0)
Acquisition of property and equipment	(0.1)	0.0	(0.1)
Proceeds from disposal of property and equipment	0.0	0.0	0.0
Depreciation and amortization	0.0	0.0	(0.1)
Foreign Countries
Segment Reporting Information [Line Items]
Revenues	99.3	101.0	116.5
Long-lived assets located in foreign countries	$ 5.3	$ 5.2	$ 6.5