We adopted the provisions of ASU 2016-02 and ASU 2018-10 on January 1, 2019 and recognized lease obligations and associated right-of-use assets for existing non-cancelable leases. We have non-cancelable operating leases primarily associated with railcars, office and manufacturing facilities, storage tanks, ships, production equipment and vehicles. Many of our leases include both lease (e.g., fixed rent) and non-lease components (e.g., maintenance and services). For certain asset classes such as railcars, storage tanks and ships, we have separated the lease and non-lease components based on the estimated stand-alone price for each component. For the remaining asset classes, we have elected the practical expedient to account for these components as a single lease component. Upon adoption, we elected other practical expedients as well, including retaining our current classification of existing leases upon adoption and excluding leases expiring within twelve months.

Many of our leases include one or more options to renew. We evaluate renewal options at the lease commencement date and regularly thereafter to determine if we are reasonably certain to exercise the option, in which case we include the renewal period in our lease term. As most of our leases do not provide an implicit rate, we use our incremental borrowing rate based on information available to determine the present value of the lease payments.

Lease expense for operating leases is recognized on a straight-line basis over the lease term. Variable lease expense is recognized in the period in which the obligation for those payments is incurred. Operating lease costs were $7.8 million and $8.0 million and variable lease costs were $1.0 million and $0.9 million during the three months ended March 31, 2020 and 2019, respectively.

The following table presents information about the amount and timing of cash flows arising from our operating leases as of March 31, 2020:

(Dollars in millions)
2020	$	22.4
2021		25.4
2022		21.7
2023		15.9
2024		13.8
Thereafter		43.7
Total lease payments	$	142.9
Less: Interest		(35.0	)
Present value of lease liabilities	$	107.9

Supplemental consolidated balance sheet information related to leases is as follows:

	Three Months Ended March 31,
	2020			2019
(Dollars in millions)
Operating leases:
Operating lease right-of-use assets	$	106.1		$	112.3
Current operating lease liabilities	$	21.5		$	22.0
Operating lease liabilities		86.4			91.5
Total operating lease liabilities	$	107.9		$	113.5
Weighted average remaining lease term, in years		6.8		$	7.1
Weighted average discount rate		7.7	%		7.7	%