Principles of Consolidation - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue from External Customer [Line Items]
Revenue	$ 1,182.3	$ 1,214.5
LTL revenue
Revenue from External Customer [Line Items]
Revenue	1,089.6	1,120.1
Other revenue
Revenue from External Customer [Line Items]
Revenue	92.7	94.4
Operating Segments | Regional Transportation
Revenue from External Customer [Line Items]
Revenue	438.6	463.3
Operating Segments | Regional Transportation | LTL revenue
Revenue from External Customer [Line Items]
Revenue	404.9	424.2
Operating Segments | Regional Transportation | Other revenue
Revenue from External Customer [Line Items]
Revenue	33.7	39.1
Operating Segments | YRC Freight
Revenue from External Customer [Line Items]
Revenue	743.8	751.3
Operating Segments | YRC Freight | LTL revenue
Revenue from External Customer [Line Items]
Revenue	684.7	695.9
Operating Segments | YRC Freight | Other revenue
Revenue from External Customer [Line Items]
Revenue	$ 59.1	$ 55.4