Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue from External Customer [Line Items]
Revenue	$ 4,871.2	$ 5,092.0	$ 4,891.0
LTL revenue
Revenue from External Customer [Line Items]
Revenue	4,494.0	4,690.6
Other revenue
Revenue from External Customer [Line Items]
Revenue	377.2	401.4
Operating Segments | YRC Freight
Revenue from External Customer [Line Items]
Revenue	3,088.7	3,197.3	3,067.9
Operating Segments | YRC Freight | LTL revenue
Revenue from External Customer [Line Items]
Revenue	2,841.0	2,948.1
Operating Segments | YRC Freight | Other revenue
Revenue from External Customer [Line Items]
Revenue	247.7	249.2
Operating Segments | Regional Transportation
Revenue from External Customer [Line Items]
Revenue	1,782.7	1,895.0	$ 1,823.4
Operating Segments | Regional Transportation | LTL revenue
Revenue from External Customer [Line Items]
Revenue	1,653.0	1,742.5
Operating Segments | Regional Transportation | Other revenue
Revenue from External Customer [Line Items]
Revenue	$ 129.7	$ 152.5