Leases - Other Information Related to Leases (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Number of railcars received		157
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$ 18,800,000	$ 58,800,000
Operating cash flows for finance leases	100,000	300,000
Financing cash flows for finance leases	10,700,000	11,300,000
Total cash from leases	$ 29,600,000	$ 70,400,000