Note 7. Leases

Our metals service center leases are comprised of processing and distribution facilities, ground leases and other leased spaces, such as depots, sales offices and storage. We also lease various office buildings, including our corporate headquarters in Los Angeles, California. Our leases of facilities and other spaces expire at various times through 2031 and our ground leases expire at various times through 2041. Nearly all of our leases are operating leases. Information regarding the insignificant amount of finance leases we have is not meaningful to an understanding of our lease obligations.

The following is a summary of our lease cost:


	Three Months Ended
	March 31,
	2019		2018
	(in millions)
Operating lease cost	$	20.8	$	19.8

Supplemental cash flow and balance sheet information is presented below:



	March 31,
	2019
	(in millions)
Supplemental cash flow information:
Operating cash flows from operating leases (three months ended)	$	(20.2)
Right-of-use assets obtained in exchange for lease obligations (three months ended)	$	11.7

Other lease information:
Weighted average remaining lease term—operating leases		5.8 years
Weighted average discount rate—operating leases		4.6%

Maturities of operating lease liabilities are as follows:


	March 31,		December 31,
	2019		2018
	(in millions)
2019	$	45.3	$	59.5
2020		48.8		45.5
2021		36.3		32.9
2022		25.2		22.7
2023		18.2		16.2
Thereafter		45.0		40.7
Total lease payments		218.8		217.5
Less: imputed interest		(32.4)		—
Total	$	186.4	$	217.5