Basis of Presentation - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue from External Customer [Line Items]
Revenue	$ 1,272.6	$ 1,326.5	$ 2,454.9	$ 2,541.0
LTL revenue
Revenue from External Customer [Line Items]
Revenue	1,176.1	1,219.1	2,265.9	2,339.3
Other revenue
Revenue from External Customer [Line Items]
Revenue	96.5	107.4	189.0	201.7
Operating Segments | Regional Transportation
Revenue from External Customer [Line Items]
Revenue	471.8	499.0	910.4	962.3
Operating Segments | Regional Transportation | LTL revenue
Revenue from External Customer [Line Items]
Revenue	438.2	458.3	843.2	882.6
Operating Segments | Regional Transportation | Other revenue
Revenue from External Customer [Line Items]
Revenue	33.6	40.7	67.2	79.7
Operating Segments | YRC Freight
Revenue from External Customer [Line Items]
Revenue	800.8	827.6	1,544.6	1,578.9
Operating Segments | YRC Freight | LTL revenue
Revenue from External Customer [Line Items]
Revenue	737.9	760.8	1,422.7	1,456.7
Operating Segments | YRC Freight | Other revenue
Revenue from External Customer [Line Items]
Revenue	$ 62.9	$ 66.8	$ 121.9	$ 122.2