We have non-cancellable operating leases primarily associated with our office facilities, rail assets, land, and storage and terminal assets. We have finance leases primarily associated with our tractors and vehicles. Our leases have remaining lease terms of 1 to 11 years, some of which include options to extend the lease term for up to 20 years.

The balances of right-of-use assets and liabilities of finance leases and operating leases, and their locations on our Consolidated Balance Sheets are as follows:

	Balance Sheet Location	March 31, 2019
Right-of-use assets
Operating leases, gross	Other long-term assets	$	35.6
Finance leases, gross	Property, plant and equipment		40.9

Lease liabilities
Current:
Operating leases	Accounts payable and accrued liabilities	$	2.7
Finance leases	Current debt obligations		10.5
Non-current:
Operating leases	Other long-term liabilities		47.8
Finance leases	Long-term debt		27.7

Operating lease costs and short-term lease costs are included in Operating expenses or General and administrative expense in our Consolidated Statements of Operations, depending on the nature of the leases. Finance lease costs are included in Depreciation and amortization expense and Interest income (expense) in our Consolidated Statements of Operations. The components of lease expense were as follows:

	Three Months Ended March 31, 2019
Lease cost
Operating lease cost	$	2.3
Short-term lease cost		7.6
Variable lease cost		1.2
Finance lease cost
Amortization of right-of-use assets		3.1
Interest expense		0.4
Total lease cost	$	14.6

	Three Months Ended March 31, 2019
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows for operating leases	$	2.0
Operating cash flows for finance leases		0.4
Financing cash flows for finance leases		2.7

The weighted-average remaining lease terms for operating leases and finance leases are 8 years and 3 years, respectively. The weighted-average discount rates for operating leases and finance leases are 4.0% and 3.9%, respectively.

The following table presents the maturities of our lease liabilities under non-cancellable leases as of March 31, 2019:

	Operating Leases			Finance Leases
Future Minimum Lease Payments Beginning After March 31,
2019	$	4.7		$	11.8
2020		8.9			11.0
2021		9.0			9.2
2022		8.0			8.2
2023		6.2			1.0
Thereafter		23.5			—
Total undiscounted cash flows		60.3			41.2
Less imputed interest		(9.8	)		(3.0	)
Total lease liabilities	$	50.5		$	38.2

The following table presents future minimum payments under non-cancellable leases as of December 31, 2018:

	Leases
2019	$	20.9
2020		20.2
2021		18.5
2022		16.5
2023		9.8
Thereafter		24.9
Total payments	$	110.8