Statement of Consolidated Comprehensive Loss - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net Loss	$ (10.8)	$ 21.5	$ 0.7
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax [Abstract]
Net actuarial gains (losses) and other adjustments	36.1	(69.5)	45.2
Net prior service credit	8.9	0.0	0.0
Settlement adjustment	6.3	0.0	25.2
Amortization of prior net losses	12.9	13.7	14.1
Changes in foreign currency translation adjustments	5.2	1.3	(12.0)
Reclassification of foreign currency translation gains to net income		(10.4)
Other comprehensive income (loss)	69.4	(64.9)	72.5
Comprehensive income (loss) attributable to YRC Worldwide Inc.	$ 58.6	$ (43.4)	$ 73.2