Changes in Operations United States - HOG (Details) - Heart of Georgia Railroad [Member] $ in Millions		3 Months Ended
	May 31, 2017 USD ($)	Mar. 31, 2018 mile carload
Business Acquisition, Percentage of Voting Interests Acquired	100.00%
Business Acquisition, Effective Date of Acquisition	May 31, 2017
Cash consideration | $	$ 5.6
Contingent consideration | $	$ 5.7
Track Miles Leased | mile		219
Annual carloads transported | carload		10,000
Annual carloads interchanged with G&W | carload		2,000