Changes in Operations United States HOG (Details) - Heart of Georgia Railroad [Member] $ in Millions		12 Months Ended
	May 31, 2017 USD ($)	Dec. 31, 2017 mile carload carloads
Business Acquisition, Effective Date of Acquisition	May 31, 2017
Cash consideration	$ 5.6
Contingent consideration	$ 5.7
Track Miles Leased | mile		221
Annual carloads transported | carload		10,000
Annual carloads interchanged with G&W | carloads		2,000