Changes in Operations U.K./Europe Optimization Restructuring Costs (Details) $ in Thousands	3 Months Ended		12 Months Ended	21 Months Ended
	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($) $ / £
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs	$ 7,634	$ 283
U.K. Operations Optimization [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs	5,496		$ 20,480
Rationalization of locomotive and railcar fleet [Member] | U.K. Operations Optimization [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs	0		6,301
Management restructuring [Member] | U.K. Operations Optimization [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs	4,083		8,723
Productivity and automation investments [Member] | U.K. Operations Optimization [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs	$ 1,413		$ 5,456
Scenario, Forecast [Member]
Restructuring Cost and Reserve [Line Items]
Foreign Currency Exchange Rate, Translation | $ / £				1.30
Scenario, Forecast [Member] | U.K. Operations Optimization [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs				$ 34,000
Scenario, Forecast [Member] | Rationalization of locomotive and railcar fleet [Member] | U.K. Operations Optimization [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs				8,000
Scenario, Forecast [Member] | Management restructuring [Member] | U.K. Operations Optimization [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs				12,000
Scenario, Forecast [Member] | Productivity and automation investments [Member] | U.K. Operations Optimization [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs				$ 14,000