Subsequent Events (Details) $ in Millions		1 Months Ended	3 Months Ended
	Feb. 26, 2019 item	Feb. 28, 2019 USD ($) item	Jun. 30, 2019 USD ($) item
Forecast [Member] | Sale Of Second Railcars [Member]
Subsequent Event [Line Items]
Number Of Railcars, Agreement To Sale			200
Disposal Group, Including Discontinued Operation, Consideration | $			$ 32.0
Subsequent Event [Member]
Subsequent Event [Line Items]
Number Of Railcars, Agreement To Sale	2,146
Subsequent Event [Member] | Sale Of First Railcars [Member]
Subsequent Event [Line Items]
Number Of Railcars, Agreement To Sale		1,946
Disposal Group, Including Discontinued Operation, Consideration | $		$ 165.3